feat: add IBinaryInteger<T>.CountDigits

The methods no longer throw TypeInitializationException, and instead now throw ArgumentException.

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -37,6 +37,8 @@ body:
       label: Version
       description: What version of the package are you running?
       options:
+        - Nightly / other
+        - 3.2.0
         - 3.1.0
         - 3.0.0
         - 2.6.0
@@ -47,6 +49,12 @@ body:
         - 2.1.0
     validations:
       required: true
+  - type: input
+    id: other-version
+    attributes:
+      label: Other version
+      description: If you selected "nightly / other", please enter the full version number here.
+      placeholder: "Example: 4.0.0-nightly-230"
   - type: textarea
     id: logs
     attributes:

.github/workflows/docfx.yml

@@ -3,20 +3,29 @@ name: DocFX
 on:
   push:
     branches: [ main ]
+  workflow_dispatch:
 
 jobs:
   docfx:
     runs-on: ubuntu-latest
     name: Publish Documentation
     steps:
-    - uses: actions/checkout@v3
-    - uses: nikeee/docfx-action@v1.0.0
-      name: Build Documentation
-      with:
-        args: docfx_project/docfx.json
-    - uses: maxheld83/ghpages@master
-      name: Publish Documentation on GitHub Pages
-      env:
-        BUILD_DIR: docfx_project/_site
-        GH_PAT: ${{ secrets.GH_PAT }}
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Copy favicon
+        run: |
+          mkdir docfx_project/images
+          cp branding_Icon.png docfx_project/images/favicon.png
+
+      - name: Build documentation
+        uses: nikeee/docfx-action@v1.0.0
+        with:
+          args: docfx_project/docfx.json
+
+      - name: Publish documentation on GitHub Pages
+        uses: maxheld83/ghpages@master
+        env:
+          BUILD_DIR: docfx_project/_site
+          GH_PAT: ${{ secrets.GH_PAT }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/dotnet.yml

@@ -3,12 +3,12 @@ name: .NET
 on:
   push:
     branches:
-      - main
-      - develop
+      - '*'
+      - '*/*'
   pull_request:
     branches:
-      - main
-      - develop
+      - '*'
+      - '*/*'
 
 jobs:
   build:

.github/workflows/nightly.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
 
 jobs:
   nightly:
@@ -32,7 +33,6 @@ jobs:
       run: |
         mkdir build
         dotnet pack X10D --configuration Debug --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}
-        dotnet pack X10D.DSharpPlus --configuration Debug --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}
         dotnet pack X10D.Hosting --configuration Debug --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}
         dotnet pack X10D.Unity --configuration Debug --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}
 

.github/workflows/prerelease.yml

@@ -32,7 +32,6 @@ jobs:
       run: |
         mkdir build
         dotnet pack X10D --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}
-        dotnet pack X10D.DSharpPlus --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}
         dotnet pack X10D.Hosting --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}
         dotnet pack X10D.Unity --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}
 

.github/workflows/release.yml

@@ -32,7 +32,6 @@ jobs:
       run: |
         mkdir build
         dotnet pack X10D --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build
-        dotnet pack X10D.DSharpPlus --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build
         dotnet pack X10D.Hosting --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build
         dotnet pack X10D.Unity --configuration Release --no-build -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build
 

.github/workflows/sonarcloud.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
   pull_request:
     types: [opened, synchronize, reopened]
 jobs:

.github/workflows/source_validator.yml

@@ -3,8 +3,7 @@ name: Source Validator
 on:
   push:
     branches:
-      - main
-      - develop
+      - '*'
   pull_request:
     types: [opened, synchronize, reopened]
 

.github/workflows/unity.yml

@@ -3,12 +3,12 @@ name: Unity Test Runner
 on:
   push:
     branches:
-      - main
-      - develop
+      - '*'
+      - '*/*'
   pull_request:
     branches:
-      - main
-      - develop
+      - '*'
+      - '*/*'
 
 jobs:
   build:

CHANGELOG.md

@@ -8,11 +8,64 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## 4.0.0 - [Unreleased]
 
 ### Added
+
 - X10D: Added extension methods for `DateOnly`, for parity with `DateTime` and `DateTimeOffset`.
 - X10D: Added math-related extension methods for `BigInteger`.
+- X10D: Added `Span<T>.Replace(T, T)`.
+- X10D: Added `CountDigits` for integer types.
+- X10D: Added `IEnumerable<T>.Except(T)`.
+- X10D: Added `Progress<T>.OnProgressChanged([T])`.
+- X10D: Added `TextWriter.WriteNoAlloc(int[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteNoAlloc(uint[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteNoAlloc(long[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteNoAlloc(ulong[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteLineNoAlloc(int[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteLineNoAlloc(uint[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteLineNoAlloc(long[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `TextWriter.WriteLineNoAlloc(ulong[, ReadOnlySpan<char>[, IFormatProvider]])`.
+- X10D: Added `string.ConcatIf`.
+- X10D.Unity: Added `RaycastHit.GetComponent` and `RaycastHit.TryGetComponent`.
+- X10D.Unity: Added `DebugUtility.DrawFunction`, and `DebugUtility.DrawUnjoinedPolyhedron` on which it relies.
+
+### Fixed
+
+- X10D: Fixed XMLDoc for `Line3D` to read "single-precision floating-point" instead of "32-bit signed integer".
 
 ### Changed
-- X10D: `DateTime.Age(DateTime)` and `DateTimeOffset.Age(DateTimeOffset)` parameter renamed from `asOf` to `referenceDate`.
+
+- X10D: DateTime.Age(DateTime) and DateTimeOffset.Age(DateTimeOffset) parameter renamed from asOf to referenceDate.
+- X10D: Methods which accepted the `Endianness` enum as an argument have been replaced with explicit
+BigEndian/LittleEndian methods.
+- X10D: `Stream.GetHash<>` and `Stream.TryWriteHash<>` now throw ArgumentException in lieu of
+TypeInitializationException.
+
+### Removed
+
+- X10D: Removed `IEnumerable<T>.ConcatOne` - this functionality already exists with `Append`.
+- X10D: Removed `Endianness` enum.
+- X10D.DSharpPlus: Complete sunset of library. This library will not be updated to support DSharpPlus v5.0.0.
+
+## [3.3.1] - 2023-08-21
+
+### Fixed
+
+- X10D.Hosting: Fixed `AddHostedSingleton` not accepting an interface as the service type.
+
+## [3.3.0] - 2023-08-21
+
+### Added
+
+- X10D.Hosting: Added support for service/implementation registration with `AddHostedSingleton`.
+
+## [3.2.2] - 2023-06-05
+
+### Added
+
+- X10D.DSharpPlus: Added support for new usernames. See https://discord.com/blog/usernames
+
+## 3.2.1 - 2023-06-05
+
+ERRONEOUS RELEASE.
 
 ## [3.2.0] - 2023-04-03
 
@@ -576,7 +629,10 @@ please [open an issue](https://github.com/oliverbooth/X10D/issues)!
 
 Earlier versions of this package are undocumented and unlisted from package results.
 
-[unreleased]: https://github.com/oliverbooth/X10D/compare/v3.2.0...main
+[unreleased]: https://github.com/oliverbooth/X10D/compare/v3.3.1...main
+[3.3.1]: https://github.com/oliverbooth/X10D/releases/tag/v3.3.1
+[3.3.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.3.0
+[3.2.2]: https://github.com/oliverbooth/X10D/releases/tag/v3.2.2
 [3.2.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.2.0
 [3.1.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.1.0
 [3.0.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.0.0

CONTRIBUTING.md

@@ -9,6 +9,10 @@ This project uses C# 11.0 language features where feasible, and adheres to Style
 There is an `.editorconfig` included in this repository. For quick and painless pull requests, ensure that the analyzer does not
 throw warnings.
 
+Please ensure that you follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/)
+specification, as the GitHub release for this project is automatically generated from the commit history, and formatted using the
+convetional commits specification.
+
 ### Code style
 
 Below are a few pointers to which you may refer, but keep in mind this is not an exhaustive list:

Directory.Build.props

@@ -1,11 +1,17 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
+<Project>
     <PropertyGroup>
         <TargetFrameworks>net7.0;net6.0;netstandard2.1</TargetFrameworks>
         <LangVersion>11.0</LangVersion>
         <Optimize>true</Optimize>
         <ImplicitUsings>true</ImplicitUsings>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <GenerateDocumentationFile>true</GenerateDocumentationFile>
+        <EnableNETAnalyzers>true</EnableNETAnalyzers>
+        <DebugType>pdbonly</DebugType>
+        <DebugSymbols>true</DebugSymbols>
+        <VersionPrefix>4.0.0</VersionPrefix>
         <Authors>Oliver Booth</Authors>
+        <Nullable>enable</Nullable>
         <NeutralLanguage>en</NeutralLanguage>
         <RepositoryUrl>https://github.com/oliverbooth/X10D</RepositoryUrl>
         <RepositoryType>git</RepositoryType>
@@ -14,16 +20,9 @@
         <PackageIcon>branding_Icon.png</PackageIcon>
         <PackageIconUrl/>
         <PackageTags>dotnet extension-methods</PackageTags>
-        <PackageReleaseNotes>$([System.IO.File]::ReadAllText("$(MSBuildProjectDirectory)/../CHANGELOG.md"))</PackageReleaseNotes>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
+        <PackageReleaseNotes>$([System.IO.File]::ReadAllText("$(SolutionDir)/CHANGELOG.md"))</PackageReleaseNotes>
         <CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>
-        <VersionPrefix>4.0.0</VersionPrefix>
-        <Nullable>enable</Nullable>
-        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-        <GenerateDocumentationFile>true</GenerateDocumentationFile>
-        <ExcludeFromCodeCoverage>true</ExcludeFromCodeCoverage>
-        <EnableNETAnalyzers>true</EnableNETAnalyzers>
-        <DebugType>pdbonly</DebugType>
-        <DebugSymbols>true</DebugSymbols>
     </PropertyGroup>
 
     <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">
@@ -48,10 +47,6 @@
         <FileVersion>$(VersionPrefix).0</FileVersion>
     </PropertyGroup>
 
-    <ItemGroup>
-        <PackageReference Include="DSharpPlus" Version="4.3.0" PrivateAssets="All"/>
-    </ItemGroup>
-
     <ItemGroup>
         <None Include="..\branding_Icon.png">
             <Pack>True</Pack>
@@ -61,10 +56,13 @@
             <Pack>True</Pack>
             <PackagePath/>
         </None>
+        <None Include="..\README.md">
+            <Pack>True</Pack>
+            <PackagePath/>
+        </None>
         <None Include="..\CHANGELOG.md">
             <Pack>True</Pack>
             <PackagePath/>
         </None>
     </ItemGroup>
-
 </Project>

README.md

@@ -17,7 +17,7 @@ X10D (pronounced *extend*), is a .NET package that provides extension methods fo
 ## Installation
 ### NuGet installation
 ```ps
-Install-Package X10D -Version 3.2.0
+Install-Package X10D -Version 4.0.0
 ```
 
 ### Manual installation

X10D.DSharpPlus/src/Assembly.cs

@@ -1 +0,0 @@
-[assembly: CLSCompliant(false)]

X10D.DSharpPlus/src/DiscordChannelExtensions.cs

@@ -1,80 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordChannel" />.
-/// </summary>
-public static class DiscordChannelExtensions
-{
-    /// <summary>
-    ///     Gets the category of this channel.
-    /// </summary>
-    /// <param name="channel">The channel whose category to retrieve.</param>
-    /// <returns>
-    ///     The category of <paramref name="channel" />, or <paramref name="channel" /> itself if it is already a category;
-    ///     <see langword="null" /> if this channel is not defined in a category.
-    /// </returns>
-    /// <exception cref="ArgumentNullException"><paramref name="channel" /> is <see langword="null" />.</exception>
-    public static DiscordChannel? GetCategory(this DiscordChannel channel)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(channel);
-#else
-        if (channel is null)
-        {
-            throw new ArgumentNullException(nameof(channel));
-        }
-#endif
-
-        while (true)
-        {
-            if (channel.IsCategory)
-            {
-                return channel;
-            }
-
-            if (channel.Parent is not { } parent)
-            {
-                return null;
-            }
-
-            channel = parent;
-        }
-    }
-
-    /// <summary>
-    ///     Normalizes a <see cref="DiscordChannel" /> so that the internal client is assured to be a specified value.
-    /// </summary>
-    /// <param name="channel">The <see cref="DiscordChannel" /> to normalize.</param>
-    /// <param name="client">The target client.</param>
-    /// <returns>
-    ///     A <see cref="DiscordChannel" /> whose public values will match <paramref name="channel" />, but whose internal client
-    ///     is <paramref name="client" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="channel" /> is <see langword="null" /></para>
-    ///     -or-
-    ///     <para><paramref name="client" /> is <see langword="null" /></para>
-    /// </exception>
-    public static async Task<DiscordChannel> NormalizeClientAsync(this DiscordChannel channel, DiscordClient client)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(channel);
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (channel is null)
-        {
-            throw new ArgumentNullException(nameof(channel));
-        }
-
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        return await client.GetChannelAsync(channel.Id).ConfigureAwait(false);
-    }
-}

X10D.DSharpPlus/src/DiscordClientExtensions.cs

@@ -1,79 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-using DSharpPlus.Exceptions;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordClient" />.
-/// </summary>
-public static class DiscordClientExtensions
-{
-    /// <summary>
-    ///     Instructs the client to automatically join all existing threads, and any newly-created threads.
-    /// </summary>
-    /// <param name="client">The <see cref="DiscordClient" /> whose events should be subscribed.</param>
-    /// <param name="rejoinIfRemoved">
-    ///     <see langword="true" /> to automatically rejoin a thread if this client was removed; otherwise,
-    ///     <see langword="false" />.
-    /// </param>
-    /// <exception cref="ArgumentNullException"><paramref name="client" /> is <see langword="null" />.</exception>
-    public static void AutoJoinThreads(this DiscordClient client, bool rejoinIfRemoved = true)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        client.GuildAvailable += (_, args) => args.Guild.JoinAllThreadsAsync();
-        client.ThreadCreated += (_, args) => args.Thread.JoinThreadAsync();
-
-        if (rejoinIfRemoved)
-        {
-            client.ThreadMembersUpdated += (_, args) =>
-            {
-                if (args.RemovedMembers.Any(m => m.Id == client.CurrentUser.Id))
-                    return args.Thread.JoinThreadAsync();
-
-                return Task.CompletedTask;
-            };
-        }
-    }
-
-    /// <summary>
-    ///     Gets a user by their ID. If the user is not found, <see langword="null" /> is returned instead of
-    ///     <see cref="NotFoundException" /> being thrown.
-    /// </summary>
-    /// <param name="client">The Discord client.</param>
-    /// <param name="userId">The ID of the user to retrieve.</param>
-    /// <exception cref="ArgumentNullException"><paramref name="client" /> is <see langword="null" />.</exception>
-    public static async Task<DiscordUser?> GetUserOrNullAsync(this DiscordClient client, ulong userId)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        try
-        {
-            // we should never use exceptions for flow control but this is D#+ we're talking about.
-            // NotFoundException isn't even documented, and yet it gets thrown when a user doesn't exist.
-            // so this method should hopefully clearly express that - and at least using exceptions for flow control *here*,
-            // removes the need to do the same in consumer code.
-            // god I hate this.
-            return await client.GetUserAsync(userId).ConfigureAwait(false);
-        }
-        catch (NotFoundException)
-        {
-            return null;
-        }
-    }
-}

X10D.DSharpPlus/src/DiscordEmbedBuilderExtensions.cs

@@ -1,239 +0,0 @@
-using DSharpPlus.Entities;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordEmbedBuilder" />.
-/// </summary>
-public static class DiscordEmbedBuilderExtensions
-{
-    /// <summary>
-    ///     Adds a field of any value type to the embed.
-    /// </summary>
-    /// <param name="builder">The <see cref="DiscordEmbedBuilder" /> to modify.</param>
-    /// <param name="name">The name of the embed field.</param>
-    /// <param name="value">The value of the embed field.</param>
-    /// <param name="inline"><see langword="true" /> to display this field inline; otherwise, <see langword="false" />.</param>
-    /// <typeparam name="T">The type of <paramref name="value" />.</typeparam>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />; that is, <paramref name="builder" />.</returns>
-    /// <exception cref="ArgumentNullException"><paramref name="builder" /> is <see langword="null" />.</exception>
-    public static DiscordEmbedBuilder AddField<T>(
-        this DiscordEmbedBuilder builder,
-        string name,
-        T? value,
-        bool inline = false)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-#endif
-
-        return builder.AddField(name, value?.ToString(), inline);
-    }
-
-    /// <summary>
-    ///     Conditionally adds a field to the embed.
-    /// </summary>
-    /// <param name="builder">The <see cref="DiscordEmbedBuilder" /> to modify.</param>
-    /// <param name="condition">The condition whose value is used to determine whether the field will be added.</param>
-    /// <param name="name">The name of the embed field.</param>
-    /// <param name="value">The value of the embed field.</param>
-    /// <param name="inline"><see langword="true" /> to display this field inline; otherwise, <see langword="false" />.</param>
-    /// <typeparam name="T">The type of <paramref name="value" />.</typeparam>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />; that is, <paramref name="builder" />.</returns>
-    /// <exception cref="ArgumentNullException"><paramref name="builder" /> is <see langword="null" />.</exception>
-    public static DiscordEmbedBuilder AddFieldIf<T>(
-        this DiscordEmbedBuilder builder,
-        bool condition,
-        string name,
-        T? value,
-        bool inline = false)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-#endif
-
-        if (condition)
-        {
-            builder.AddField(name, value?.ToString(), inline);
-        }
-
-        return builder;
-    }
-
-    /// <summary>
-    ///     Conditionally adds a field to the embed.
-    /// </summary>
-    /// <param name="builder">The <see cref="DiscordEmbedBuilder" /> to modify.</param>
-    /// <param name="predicate">The predicate whose return value is used to determine whether the field will be added.</param>
-    /// <param name="name">The name of the embed field.</param>
-    /// <param name="value">The value of the embed field.</param>
-    /// <param name="inline"><see langword="true" /> to display this field inline; otherwise, <see langword="false" />.</param>
-    /// <typeparam name="T">The type of <paramref name="value" />.</typeparam>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />; that is, <paramref name="builder" />.</returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="builder" /> is <see langword="null" />.</para>
-    ///     -or-
-    ///     <para><paramref name="predicate" /> is <see langword="null" />.</para>
-    /// </exception>
-    public static DiscordEmbedBuilder AddFieldIf<T>(
-        this DiscordEmbedBuilder builder,
-        Func<bool> predicate,
-        string name,
-        T? value,
-        bool inline = false)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-        ArgumentNullException.ThrowIfNull(predicate);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
-#endif
-
-        if (predicate.Invoke())
-        {
-            builder.AddField(name, value?.ToString(), inline);
-        }
-
-        return builder;
-    }
-
-    /// <summary>
-    ///     Conditionally adds a field to the embed.
-    /// </summary>
-    /// <param name="builder">The <see cref="DiscordEmbedBuilder" /> to modify.</param>
-    /// <param name="predicate">The predicate whose return value is used to determine whether the field will be added.</param>
-    /// <param name="name">The name of the embed field.</param>
-    /// <param name="valueFactory">The delegate whose return value will be used as the value of the embed field.</param>
-    /// <param name="inline"><see langword="true" /> to display this field inline; otherwise, <see langword="false" />.</param>
-    /// <typeparam name="T">The return type of <paramref name="valueFactory" />.</typeparam>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />; that is, <paramref name="builder" />.</returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="builder" /> is <see langword="null" />.</para>
-    ///     -or-
-    ///     <para><paramref name="predicate" /> is <see langword="null" />.</para>
-    ///     -or-
-    ///     <para><paramref name="valueFactory" /> is <see langword="null" />.</para>
-    /// </exception>
-    public static DiscordEmbedBuilder AddFieldIf<T>(
-        this DiscordEmbedBuilder builder,
-        Func<bool> predicate,
-        string name,
-        Func<T?> valueFactory,
-        bool inline = false)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-        ArgumentNullException.ThrowIfNull(predicate);
-        ArgumentNullException.ThrowIfNull(valueFactory);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
-
-        if (valueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(valueFactory));
-        }
-#endif
-
-        if (predicate.Invoke())
-        {
-            builder.AddField(name, valueFactory.Invoke()?.ToString(), inline);
-        }
-
-        return builder;
-    }
-
-    /// <summary>
-    ///     Conditionally adds a field to the embed.
-    /// </summary>
-    /// <param name="builder">The <see cref="DiscordEmbedBuilder" /> to modify.</param>
-    /// <param name="condition">The condition whose value is used to determine whether the field will be added.</param>
-    /// <param name="name">The name of the embed field.</param>
-    /// <param name="valueFactory">The delegate whose return value will be used as the value of the embed field.</param>
-    /// <param name="inline"><see langword="true" /> to display this field inline; otherwise, <see langword="false" />.</param>
-    /// <typeparam name="T">The return type of <paramref name="valueFactory" />.</typeparam>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />; that is, <paramref name="builder" />.</returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="builder" /> is <see langword="null" />.</para>
-    ///     -or-
-    ///     <para><paramref name="valueFactory" /> is <see langword="null" />.</para>
-    /// </exception>
-    public static DiscordEmbedBuilder AddFieldIf<T>(
-        this DiscordEmbedBuilder builder,
-        bool condition,
-        string name,
-        Func<T?> valueFactory,
-        bool inline = false)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-        ArgumentNullException.ThrowIfNull(valueFactory);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-        if (valueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(valueFactory));
-        }
-#endif
-
-        if (condition)
-        {
-            builder.AddField(name, valueFactory.Invoke()?.ToString(), inline);
-        }
-
-        return builder;
-    }
-
-    /// <summary>
-    ///     Sets the embed's author.
-    /// </summary>
-    /// <param name="builder">The embed builder to modify.</param>
-    /// <param name="user">The author.</param>
-    /// <returns>The current instance of <see cref="DiscordEmbedBuilder" />.</returns>
-    public static DiscordEmbedBuilder WithAuthor(this DiscordEmbedBuilder builder, DiscordUser user)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(builder);
-        ArgumentNullException.ThrowIfNull(user);
-#else
-        if (builder is null)
-        {
-            throw new ArgumentNullException(nameof(builder));
-        }
-        if (user is null)
-        {
-            throw new ArgumentNullException(nameof(user));
-        }
-#endif
-
-        return builder.WithAuthor(user.GetUsernameWithDiscriminator(), iconUrl: user.AvatarUrl);
-    }
-}

X10D.DSharpPlus/src/DiscordGuildExtensions.cs

@@ -1,97 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-using DSharpPlus.Exceptions;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordGuild" />.
-/// </summary>
-public static class DiscordGuildExtensions
-{
-    /// <summary>
-    ///     Joins all active threads in the guild that this client has permission to view.
-    /// </summary>
-    /// <param name="guild">The guild whose active threads to join.</param>
-    /// <exception cref="ArgumentNullException"><paramref name="guild" /> is <see langword="null" />.</exception>
-    public static async Task JoinAllThreadsAsync(this DiscordGuild guild)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(guild);
-#else
-        if (guild is null)
-        {
-            throw new ArgumentNullException(nameof(guild));
-        }
-#endif
-
-        await Task.WhenAll(guild.Threads.Values.Select(t => t.JoinThreadAsync())).ConfigureAwait(false);
-    }
-
-    /// <summary>
-    ///     Gets a guild member by their ID. If the member is not found, <see langword="null" /> is returned instead of
-    ///     <see cref="NotFoundException" /> being thrown.
-    /// </summary>
-    /// <param name="guild">The guild whose member list to search.</param>
-    /// <param name="userId">The ID of the member to retrieve.</param>
-    /// <exception cref="ArgumentNullException"><paramref name="guild" /> is <see langword="null" />.</exception>
-    public static async Task<DiscordMember?> GetMemberOrNullAsync(this DiscordGuild guild, ulong userId)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(guild);
-#else
-        if (guild is null)
-        {
-            throw new ArgumentNullException(nameof(guild));
-        }
-#endif
-
-        try
-        {
-            // we should never use exceptions for flow control but this is D#+ we're talking about.
-            // NotFoundException isn't even documented, and yet it gets thrown when a member doesn't exist.
-            // so this method should hopefully clearly express that - and at least using exceptions for flow control *here*,
-            // removes the need to do the same in consumer code.
-            // god I hate this.
-            return await guild.GetMemberAsync(userId).ConfigureAwait(false);
-        }
-        catch (NotFoundException)
-        {
-            return null;
-        }
-    }
-
-    /// <summary>
-    ///     Normalizes a <see cref="DiscordGuild" /> so that the internal client is assured to be a specified value.
-    /// </summary>
-    /// <param name="guild">The <see cref="DiscordGuild" /> to normalize.</param>
-    /// <param name="client">The target client.</param>
-    /// <returns>
-    ///     A <see cref="DiscordGuild" /> whose public values will match <paramref name="guild" />, but whose internal client is
-    ///     <paramref name="client" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="guild" /> is <see langword="null" /></para>
-    ///     -or-
-    ///     <para><paramref name="client" /> is <see langword="null" /></para>
-    /// </exception>
-    public static async Task<DiscordGuild> NormalizeClientAsync(this DiscordGuild guild, DiscordClient client)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(guild);
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (guild is null)
-        {
-            throw new ArgumentNullException(nameof(guild));
-        }
-
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        return await client.GetGuildAsync(guild.Id).ConfigureAwait(false);
-    }
-}

X10D.DSharpPlus/src/DiscordMemberExtensions.cs

@@ -1,73 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordMember" />.
-/// </summary>
-public static class DiscordMemberExtensions
-{
-    /// <summary>
-    ///     Returns a value indicating whether this member has the specified role.
-    /// </summary>
-    /// <param name="member">The member whose roles to search.</param>
-    /// <param name="role">The role for which to check.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="member" /> has the role; otherwise, <see langword="false" />.
-    /// </returns>
-    public static bool HasRole(this DiscordMember member, DiscordRole role)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(member);
-        ArgumentNullException.ThrowIfNull(role);
-#else
-        if (member is null)
-        {
-            throw new ArgumentNullException(nameof(member));
-        }
-
-        if (role is null)
-        {
-            throw new ArgumentNullException(nameof(role));
-        }
-#endif
-
-        return member.Roles.Contains(role);
-    }
-
-    /// <summary>
-    ///     Normalizes a <see cref="DiscordMember" /> so that the internal client is assured to be a specified value.
-    /// </summary>
-    /// <param name="member">The <see cref="DiscordMember" /> to normalize.</param>
-    /// <param name="client">The target client.</param>
-    /// <returns>
-    ///     A <see cref="DiscordMember" /> whose public values will match <paramref name="member" />, but whose internal client
-    ///     is <paramref name="client" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="member" /> is <see langword="null" /></para>
-    ///     -or-
-    ///     <para><paramref name="client" /> is <see langword="null" /></para>
-    /// </exception>
-    public static async Task<DiscordMember> NormalizeClientAsync(this DiscordMember member, DiscordClient client)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(member);
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (member is null)
-        {
-            throw new ArgumentNullException(nameof(member));
-        }
-
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        DiscordGuild guild = await member.Guild.NormalizeClientAsync(client).ConfigureAwait(false);
-        return await guild.GetMemberAsync(member.Id).ConfigureAwait(false);
-    }
-}

X10D.DSharpPlus/src/DiscordMessageExtensions.cs

@@ -1,89 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordMessage" />.
-/// </summary>
-public static class DiscordMessageExtensions
-{
-    /// <summary>
-    ///     Deletes this message after a specified delay.
-    /// </summary>
-    /// <param name="message">The message to delete.</param>
-    /// <param name="delay">The delay before deletion.</param>
-    /// <param name="reason">The reason for the deletion.</param>
-    /// <exception cref="ArgumentNullException"><paramref name="message" /> is <see langword="null" />.</exception>
-    public static async Task DeleteAfterAsync(this DiscordMessage message, TimeSpan delay, string? reason = null)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(message);
-#else
-        if (message is null)
-        {
-            throw new ArgumentNullException(nameof(message));
-        }
-#endif
-
-        await Task.Delay(delay).ConfigureAwait(false);
-        await message.DeleteAsync(reason).ConfigureAwait(false);
-    }
-
-    /// <summary>
-    ///     Deletes the message as created by this task after a specified delay.
-    /// </summary>
-    /// <param name="task">The task whose <see cref="DiscordMessage" /> result should be deleted.</param>
-    /// <param name="delay">The delay before deletion.</param>
-    /// <param name="reason">The reason for the deletion.</param>
-    /// <exception cref="ArgumentNullException"><paramref name="task" /> is <see langword="null" />.</exception>
-    public static async Task DeleteAfterAsync(this Task<DiscordMessage> task, TimeSpan delay, string? reason = null)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(task);
-#else
-        if (task is null)
-        {
-            throw new ArgumentNullException(nameof(task));
-        }
-#endif
-
-        DiscordMessage message = await task.ConfigureAwait(false);
-        await message.DeleteAfterAsync(delay, reason).ConfigureAwait(false);
-    }
-
-    /// <summary>
-    ///     Normalizes a <see cref="DiscordMessage" /> so that the internal client is assured to be a specified value.
-    /// </summary>
-    /// <param name="message">The <see cref="DiscordMessage" /> to normalize.</param>
-    /// <param name="client">The target client.</param>
-    /// <returns>
-    ///     A <see cref="DiscordMessage" /> whose public values will match <paramref name="message" />, but whose internal client
-    ///     is <paramref name="client" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="message" /> is <see langword="null" /></para>
-    ///     -or-
-    ///     <para><paramref name="client" /> is <see langword="null" /></para>
-    /// </exception>
-    public static async Task<DiscordMessage> NormalizeClientAsync(this DiscordMessage message, DiscordClient client)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(message);
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (message is null)
-        {
-            throw new ArgumentNullException(nameof(message));
-        }
-
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        DiscordChannel channel = await message.Channel.NormalizeClientAsync(client).ConfigureAwait(false);
-        return await channel.GetMessageAsync(message.Id).ConfigureAwait(false);
-    }
-}

X10D.DSharpPlus/src/DiscordUserExtensions.cs

@@ -1,158 +0,0 @@
-using DSharpPlus;
-using DSharpPlus.Entities;
-using DSharpPlus.Exceptions;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Extension methods for <see cref="DiscordUser" />.
-/// </summary>
-public static class DiscordUserExtensions
-{
-    /// <summary>
-    ///     Returns the current <see cref="DiscordUser" /> as a member of the specified guild.
-    /// </summary>
-    /// <param name="user">The user to transform.</param>
-    /// <param name="guild">The guild whose member list to search.</param>
-    /// <returns>
-    ///     A <see cref="DiscordMember" /> whose <see cref="DiscordMember.Guild" /> is equal to <paramref name="guild" />, or
-    ///     <see langword="null" /> if this user is not in the specified <paramref name="guild" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="user" /> is <see langword="null" />.</para>
-    ///     -or-
-    ///     <para><paramref name="guild" /> is <see langword="null" />.</para>
-    /// </exception>
-    public static async Task<DiscordMember?> GetAsMemberOfAsync(this DiscordUser user, DiscordGuild guild)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(user);
-        ArgumentNullException.ThrowIfNull(guild);
-#else
-        if (user is null)
-        {
-            throw new ArgumentNullException(nameof(user));
-        }
-
-        if (guild is null)
-        {
-            throw new ArgumentNullException(nameof(guild));
-        }
-#endif
-
-        if (user is DiscordMember member && member.Guild == guild)
-        {
-            return member;
-        }
-
-        if (guild.Members.TryGetValue(user.Id, out member!))
-        {
-            return member;
-        }
-
-        try
-        {
-            return await guild.GetMemberAsync(user.Id).ConfigureAwait(false);
-        }
-        catch (NotFoundException)
-        {
-            return null;
-        }
-    }
-
-    /// <summary>
-    ///     Returns the user's username with the discriminator, in the format <c>username#discriminator</c>.
-    /// </summary>
-    /// <param name="user">The user whose username and discriminator to retrieve.</param>
-    /// <returns>A string in the format <c>username#discriminator</c></returns>
-    /// <exception cref="ArgumentNullException"><paramref name="user" /> is <see langword="null" />.</exception>
-    public static string GetUsernameWithDiscriminator(this DiscordUser user)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(user);
-#else
-        if (user is null)
-        {
-            throw new ArgumentNullException(nameof(user));
-        }
-#endif
-
-        return $"{user.Username}#{user.Discriminator}";
-    }
-
-    /// <summary>
-    ///     Returns a value indicating whether the current user is in the specified guild.
-    /// </summary>
-    /// <param name="user">The user to check.</param>
-    /// <param name="guild">The guild whose member list to search.</param>
-    /// <returns>
-    ///     <see langword="true" /> if <paramref name="user" /> is a member of <paramref name="guild" />; otherwise,
-    ///     <see langword="false" />.
-    /// </returns>
-    public static async Task<bool> IsInGuildAsync(this DiscordUser user, DiscordGuild guild)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(user);
-        ArgumentNullException.ThrowIfNull(guild);
-#else
-        if (user is null)
-        {
-            throw new ArgumentNullException(nameof(user));
-        }
-
-        if (guild is null)
-        {
-            throw new ArgumentNullException(nameof(guild));
-        }
-#endif
-
-        if (guild.Members.TryGetValue(user.Id, out _))
-        {
-            return true;
-        }
-
-        try
-        {
-            DiscordMember? member = await guild.GetMemberAsync(user.Id).ConfigureAwait(false);
-            return member is not null;
-        }
-        catch (NotFoundException)
-        {
-            return false;
-        }
-    }
-
-    /// <summary>
-    ///     Normalizes a <see cref="DiscordUser" /> so that the internal client is assured to be a specified value.
-    /// </summary>
-    /// <param name="user">The <see cref="DiscordUser" /> to normalize.</param>
-    /// <param name="client">The target client.</param>
-    /// <returns>
-    ///     A <see cref="DiscordUser" /> whose public values will match <paramref name="user" />, but whose internal client is
-    ///     <paramref name="client" />.
-    /// </returns>
-    /// <exception cref="ArgumentNullException">
-    ///     <para><paramref name="user" /> is <see langword="null" /></para>
-    ///     -or-
-    ///     <para><paramref name="client" /> is <see langword="null" /></para>
-    /// </exception>
-    public static async Task<DiscordUser> NormalizeClientAsync(this DiscordUser user, DiscordClient client)
-    {
-#if NET6_0_OR_GREATER
-        ArgumentNullException.ThrowIfNull(user);
-        ArgumentNullException.ThrowIfNull(client);
-#else
-        if (user is null)
-        {
-            throw new ArgumentNullException(nameof(user));
-        }
-
-        if (client is null)
-        {
-            throw new ArgumentNullException(nameof(client));
-        }
-#endif
-
-        return await client.GetUserAsync(user.Id).ConfigureAwait(false);
-    }
-}

X10D.DSharpPlus/src/MentionUtility.cs

@@ -1,329 +0,0 @@
-using System.Globalization;
-
-namespace X10D.DSharpPlus;
-
-/// <summary>
-///     Provides methods for encoding and decoding Discord mention strings.
-/// </summary>
-/// <remarks>
-///     The implementations in this class are designed to resemble <c>MentionUtils</c> as provided by Discord.NET. The source is
-///     available
-///     <a href="https://github.com/discord-net/Discord.Net/blob/dev/src/Discord.Net.Core/Utils/MentionUtils.cs">
-///         here
-///     </a>.
-/// </remarks>
-public static class MentionUtility
-{
-    /// <summary>
-    ///     Returns a channel mention string built from the specified channel ID.
-    /// </summary>
-    /// <param name="id">The ID of the channel to mention.</param>
-    /// <returns>A channel mention string in the format <c>&lt;#123&gt;</c>.</returns>
-    public static string MentionChannel(decimal id)
-    {
-        return $"<#{id:N0}>";
-    }
-
-    /// <summary>
-    ///     Returns a channel mention string built from the specified channel ID.
-    /// </summary>
-    /// <param name="id">The ID of the channel to mention.</param>
-    /// <returns>A channel mention string in the format <c>&lt;#123&gt;</c>.</returns>
-    [CLSCompliant(false)]
-    public static string MentionChannel(ulong id)
-    {
-        return $"<#{id}>";
-    }
-
-    /// <summary>
-    ///     Returns a role mention string built from the specified channel ID.
-    /// </summary>
-    /// <param name="id">The ID of the role to mention.</param>
-    /// <returns>A role mention string in the format <c>&lt;@&amp;123&gt;</c>.</returns>
-    public static string MentionRole(decimal id)
-    {
-        return $"<@&{id:N0}>";
-    }
-
-    /// <summary>
-    ///     Returns a role mention string built from the specified role ID.
-    /// </summary>
-    /// <param name="id">The ID of the role to mention.</param>
-    /// <returns>A role mention string in the format <c>&lt;@&amp;123&gt;</c>.</returns>
-    [CLSCompliant(false)]
-    public static string MentionRole(ulong id)
-    {
-        return $"<@&{id}>";
-    }
-
-    /// <summary>
-    ///     Returns a user mention string built from the specified user ID.
-    /// </summary>
-    /// <param name="id">The ID of the user to mention.</param>
-    /// <returns>A user mention string in the format <c>&lt;@123&gt;</c>.</returns>
-    [CLSCompliant(false)]
-    public static string MentionUser(decimal id)
-    {
-        return MentionUser(id, false);
-    }
-
-    /// <summary>
-    ///     Returns a user mention string built from the specified user ID.
-    /// </summary>
-    /// <param name="id">The ID of the user to mention.</param>
-    /// <param name="nickname">
-    ///     <see langword="true" /> if the mention string should account for nicknames; otherwise, <see langword="false" />.
-    /// </param>
-    /// <returns>
-    ///     A user mention string in the format <c>&lt;@!123&gt;</c> if <paramref name="nickname" /> is <see langword="true" />,
-    ///     or in the format <c>&lt;@123&gt;</c> if <paramref name="nickname" /> is <see langword="false" />.
-    /// </returns>
-    [CLSCompliant(false)]
-    public static string MentionUser(decimal id, bool nickname)
-    {
-        return nickname ? $"<@!{id:N0}>" : $"<@{id:N0}>";
-    }
-
-    /// <summary>
-    ///     Returns a user mention string built from the specified user ID.
-    /// </summary>
-    /// <param name="id">The ID of the user to mention.</param>
-    /// <returns>A user mention string in the format <c>&lt;@123&gt;</c>.</returns>
-    [CLSCompliant(false)]
-    public static string MentionUser(ulong id)
-    {
-        return MentionUser(id, false);
-    }
-
-    /// <summary>
-    ///     Returns a user mention string built from the specified user ID.
-    /// </summary>
-    /// <param name="id">The ID of the user to mention.</param>
-    /// <param name="nickname">
-    ///     <see langword="true" /> if the mention string should account for nicknames; otherwise, <see langword="false" />.
-    /// </param>
-    /// <returns>
-    ///     A user mention string in the format <c>&lt;@!123&gt;</c> if <paramref name="nickname" /> is <see langword="true" />,
-    ///     or in the format <c>&lt;@123&gt;</c> if <paramref name="nickname" /> is <see langword="false" />.
-    /// </returns>
-    [CLSCompliant(false)]
-    public static string MentionUser(ulong id, bool nickname)
-    {
-        return nickname ? $"<@!{id}>" : $"<@{id}>";
-    }
-
-    /// <summary>
-    ///     Parses a provided channel mention string to a decimal value representing the channel ID. A return value indicates
-    ///     whether the parse succeeded.
-    /// </summary>
-    /// <param name="value">A string containing a mention string to parse, in the format <c>&lt;#123&gt;</c>.</param>
-    /// <param name="result">
-    ///     When this method returns, contains the decimal value representing the channel ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    public static bool TryParseChannel(string? value, out decimal result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 3 || value[0] != '<' || value[1] != '#' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        value = value.Substring(2, value.Length - 3); // <#123>
-        if (!ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out ulong actual))
-        {
-            return false;
-        }
-
-        result = actual;
-        return true;
-    }
-
-    /// <summary>
-    ///     Parses a provided channel mention string to a 64-bit unsigned integer representing the channel ID. A return value
-    ///     indicates whether the parse succeeded.
-    /// </summary>
-    /// <param name="value">A string containing a mention string to parse, in the format <c>&lt;#123&gt;</c>.</param>
-    /// <param name="result">
-    ///     When this method returns, contains the 64-bit unsigned integer value representing the channel ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    [CLSCompliant(false)]
-    public static bool TryParseChannel(string? value, out ulong result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 3 || value[0] != '<' || value[1] != '#' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        value = value.Substring(2, value.Length - 3); // <#123>
-        return ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out result);
-    }
-
-    /// <summary>
-    ///     Parses a provided role mention string to a decimal value representing the role ID. A return value indicates whether
-    ///     the parse succeeded.
-    /// </summary>
-    /// <param name="value">A string containing a mention string to parse, in the format <c>&lt;@&amp;123&gt;</c>.</param>
-    /// <param name="result">
-    ///     When this method returns, contains the decimal value representing the role ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    public static bool TryParseRole(string? value, out decimal result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 4 || value[0] != '<' || value[1] != '@' || value[2] != '&' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        value = value.Substring(3, value.Length - 4); // <@&123>
-        if (!ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out ulong actual))
-        {
-            return false;
-        }
-
-        result = actual;
-        return true;
-    }
-
-    /// <summary>
-    ///     Parses a provided role mention string to a 64-bit unsigned integer representing the role ID. A return value indicates
-    ///     whether the parse succeeded.
-    /// </summary>
-    /// <param name="value">A string containing a mention string to parse, in the format <c>&lt;@&amp;123&gt;</c>.</param>
-    /// <param name="result">
-    ///     When this method returns, contains the 64-bit unsigned integer value representing the role ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    [CLSCompliant(false)]
-    public static bool TryParseRole(string? value, out ulong result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 4 || value[0] != '<' || value[1] != '@' || value[2] != '&' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        value = value.Substring(3, value.Length - 4); // <@&123>
-        return ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out result);
-    }
-
-    /// <summary>
-    ///     Parses a provided user mention string to a decimal value representing the user ID. A return value indicates whether
-    ///     the parse succeeded.
-    /// </summary>
-    /// <param name="value">
-    ///     A string containing a mention string to parse, in the format <c>&lt;@123&gt;</c> or <c>&lt;@!123&gt;</c>.
-    /// </param>
-    /// <param name="result">
-    ///     When this method returns, contains the decimal value representing the user ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    public static bool TryParseUser(string? value, out decimal result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 3 || value[0] != '<' || value[1] != '@' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        if (value.Length >= 4 && value[2] == '!')
-        {
-            value = value.Substring(3, value.Length - 4); // <@!123>
-        }
-        else
-        {
-            value = value.Substring(2, value.Length - 3); // <@123>
-        }
-
-        if (!ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out ulong actual))
-        {
-            return false;
-        }
-
-        result = actual;
-        return true;
-    }
-
-    /// <summary>
-    ///     Parses a provided user mention string to a 64-bit unsigned integer representing the user ID. A return value indicates
-    ///     whether the parse succeeded.
-    /// </summary>
-    /// <param name="value">
-    ///     A string containing a mention string to parse, in the format <c>&lt;@123&gt;</c> or <c>&lt;@!123&gt;</c>.
-    /// </param>
-    /// <param name="result">
-    ///     When this method returns, contains the 64-bit unsigned integer value representing the user ID contained within
-    ///     <paramref name="value" />, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the
-    ///     <paramref name="value" /> parameter is <see langword="null" /> or <see cref="string.Empty" />, is not of the correct
-    ///     format, or represents a number less than <see cref="ulong.MinValue" /> or greater than <see cref="ulong.MaxValue" />.
-    /// </param>
-    /// <returns><see langword="true" /> if the parse was successful; otherwise, <see langword="false" />.</returns>
-    [CLSCompliant(false)]
-    public static bool TryParseUser(string? value, out ulong result)
-    {
-        result = 0;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        if (value.Length < 3 || value[0] != '<' || value[1] != '@' || value[^1] != '>')
-        {
-            return false;
-        }
-
-        if (value.Length >= 4 && value[2] == '!')
-        {
-            value = value.Substring(3, value.Length - 4); // <@!123>
-        }
-        else
-        {
-            value = value.Substring(2, value.Length - 3); // <@123>
-        }
-
-        return ulong.TryParse(value, NumberStyles.None, CultureInfo.InvariantCulture, out result);
-    }
-}

X10D.Hosting/X10D.Hosting.csproj

@@ -1,69 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-    <PropertyGroup>
-        <TargetFrameworks>net7.0;net6.0;netstandard2.1</TargetFrameworks>
-        <LangVersion>11.0</LangVersion>
-        <Optimize>true</Optimize>
-        <ImplicitUsings>true</ImplicitUsings>
-        <Authors>Oliver Booth</Authors>
-        <NeutralLanguage>en</NeutralLanguage>
-        <RepositoryUrl>https://github.com/oliverbooth/X10D</RepositoryUrl>
-        <RepositoryType>git</RepositoryType>
-        <Description>Extension methods on crack.</Description>
-        <PackageLicenseFile>LICENSE.md</PackageLicenseFile>
-        <PackageIcon>branding_Icon.png</PackageIcon>
-        <PackageIconUrl/>
-        <PackageTags>dotnet extension-methods</PackageTags>
-        <PackageReleaseNotes>$([System.IO.File]::ReadAllText("$(MSBuildProjectDirectory)/../CHANGELOG.md"))</PackageReleaseNotes>
-        <CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>
-        <VersionPrefix>4.0.0</VersionPrefix>
-        <Nullable>enable</Nullable>
-        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-        <GenerateDocumentationFile>true</GenerateDocumentationFile>
-        <EnableNETAnalyzers>true</EnableNETAnalyzers>
-        <DebugType>pdbonly</DebugType>
-        <DebugSymbols>true</DebugSymbols>
-    </PropertyGroup>
-
-    <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">
-        <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
-    </PropertyGroup>
-
-    <PropertyGroup Condition="'$(VersionSuffix)' != '' And '$(BuildNumber)' == ''">
-        <Version>$(VersionPrefix)-$(VersionSuffix)</Version>
-        <AssemblyVersion>$(VersionPrefix).0</AssemblyVersion>
-        <FileVersion>$(VersionPrefix).0</FileVersion>
-    </PropertyGroup>
-
-    <PropertyGroup Condition="'$(VersionSuffix)' != '' And '$(BuildNumber)' != ''">
-        <Version>$(VersionPrefix)-$(VersionSuffix).$(BuildNumber)</Version>
-        <AssemblyVersion>$(VersionPrefix).$(BuildNumber)</AssemblyVersion>
-        <FileVersion>$(VersionPrefix).$(BuildNumber)</FileVersion>
-    </PropertyGroup>
-
-    <PropertyGroup Condition="'$(VersionSuffix)' == ''">
-        <Version>$(VersionPrefix)</Version>
-        <AssemblyVersion>$(VersionPrefix).0</AssemblyVersion>
-        <FileVersion>$(VersionPrefix).0</FileVersion>
-    </PropertyGroup>
-
     <ItemGroup>
         <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="7.0.0"/>
     </ItemGroup>
 
-    <ItemGroup>
-        <None Include="..\branding_Icon.png">
-            <Pack>True</Pack>
-            <PackagePath/>
-        </None>
-        <None Include="..\LICENSE.md">
-            <Pack>True</Pack>
-            <PackagePath/>
-        </None>
-        <None Include="..\CHANGELOG.md">
-            <Pack>True</Pack>
-            <PackagePath/>
-        </None>
-    </ItemGroup>
-
 </Project>

X10D.Hosting/src/DependencyInjection/ServiceCollectionExtensions.cs

@@ -21,6 +21,22 @@ public static class ServiceCollectionExtensions
         return services.AddSingleton<IHostedService, TService>(provider => provider.GetRequiredService<TService>());
     }
 
+    /// <summary>
+    ///     Adds an <see cref="IHostedService" /> registration for the given type, while simultaneously adding it as a singleton.
+    /// </summary>
+    /// <param name="services">The <see cref="IServiceCollection" /> to add the service to.</param>
+    /// <typeparam name="TService">The type of the service to add.</typeparam>
+    /// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
+    /// <returns>A reference to this instance after the operation has completed.</returns>
+    public static IServiceCollection AddHostedSingleton<TService, TImplementation>(this IServiceCollection services)
+        where TService : class
+        where TImplementation : class, TService, IHostedService
+    {
+        services.AddSingleton<TService, TImplementation>();
+        return services.AddSingleton<IHostedService, TImplementation>(provider =>
+            (TImplementation)provider.GetRequiredService<TService>());
+    }
+
     /// <summary>
     ///     Adds an <see cref="IHostedService" /> registration for the given type, while simultaneously adding it as a singleton.
     /// </summary>
@@ -32,4 +48,19 @@ public static class ServiceCollectionExtensions
         services.AddSingleton(type);
         return services.AddSingleton(provider => (IHostedService)provider.GetRequiredService(type));
     }
+
+    /// <summary>
+    ///     Adds an <see cref="IHostedService" /> registration for the given type, while simultaneously adding it as a singleton.
+    /// </summary>
+    /// <param name="services">The <see cref="IServiceCollection" /> to add the service to.</param>
+    /// <param name="serviceType">The type of the service to register.</param>
+    /// <param name="implementationType">The type of the implementation to use.</param>
+    /// <returns>A reference to this instance after the operation has completed.</returns>
+    public static IServiceCollection AddHostedSingleton(this IServiceCollection services,
+        Type serviceType,
+        Type implementationType)
+    {
+        services.AddSingleton(serviceType, implementationType);
+        return services.AddSingleton(provider => (IHostedService)provider.GetRequiredService(serviceType));
+    }
 }

X10D.Tests/X10D.Tests.csproj

@@ -2,24 +2,25 @@
 
     <PropertyGroup>
         <TargetFrameworks>net7.0;net6.0;netcoreapp3.1</TargetFrameworks>
-        <LangVersion>11.0</LangVersion>
         <IsPackable>false</IsPackable>
-        <Nullable>enable</Nullable>
-        <ImplicitUsings>true</ImplicitUsings>
         <CoverletOutputFormat>json,cobertura</CoverletOutputFormat>
         <CollectCoverage>true</CollectCoverage>
+        <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>
+    </PropertyGroup>
+
+    <PropertyGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+        <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.0"/>
+        <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0"/>
-        <PackageReference Include="Moq" Version="4.18.4"/>
-        <PackageReference Include="MSTest.TestAdapter" Version="3.0.2"/>
-        <PackageReference Include="MSTest.TestFramework" Version="3.0.2"/>
-        <PackageReference Include="coverlet.collector" Version="3.2.0">
-            <PrivateAssets>all</PrivateAssets>
-            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-        </PackageReference>
+        <PackageReference Include="NSubstitute" Version="5.0.0"/>
+        <PackageReference Include="NUnit" Version="3.13.3"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="4.4.2"/>
+        <PackageReference Include="NUnit.Analyzers" Version="3.6.1"/>
+        <PackageReference Include="coverlet.collector" Version="3.2.0"/>
+        <PackageReference Include="System.Reactive" Version="5.0.0"/>
     </ItemGroup>
 
     <ItemGroup>

X10D.Tests/src/Assembly.cs

@@ -1 +1 @@
-[assembly: CLSCompliant(true)]
+[assembly: CLSCompliant(false)]

X10D.Tests/src/Collections/ArrayTests.AsReadOnly.cs

@@ -1,42 +1,42 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class ArrayTests
+internal static partial class ArrayTests
 {
-    [TestClass]
-    public class AsReadOnlyTests
+    [TestFixture]
+    internal class AsReadOnlyTests
     {
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnReadOnlyCollection_WhenArrayIsNotNull()
         {
             int[] array = {1, 2, 3};
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.IsInstanceOfType(result, typeof(IReadOnlyCollection<int>));
+            Assert.That(result, Is.InstanceOf<IReadOnlyCollection<int>>());
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldThrowArgumentNullException_WhenArrayIsNull()
         {
-            int[]? array = null;
-            Assert.ThrowsException<ArgumentNullException>(() => array!.AsReadOnly());
+            int[] array = null!;
+            Assert.Throws<ArgumentNullException>(() => _ = array.AsReadOnly());
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnCorrectCount_WhenArrayIsNotEmpty()
         {
             int[] array = {1, 2, 3};
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.AreEqual(array.Length, result.Count);
+            Assert.That(result, Has.Count.EqualTo(array.Length));
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnEmptyCollection_WhenArrayIsEmpty()
         {
             int[] array = Array.Empty<int>();
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.AreEqual(0, result.Count);
+            Assert.That(result, Is.Empty);
         }
     }
 }

X10D.Tests/src/Collections/ArrayTests.Clear.cs

@@ -1,63 +1,63 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class ArrayTests
+internal static partial class ArrayTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearTests
     {
-        [TestMethod]
+        [Test]
         public void Clear_ShouldClearTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear();
 
-            Assert.IsTrue(array.All(x => x == null));
+            Assert.That(array.All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_ShouldDoNothing_WhenArrayIsEmpty()
         {
             int[] array = Array.Empty<int>();
             array.Clear();
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_WithRange_ShouldClearTheSpecifiedRangeOfTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear(1..4);
 
-            Assert.AreEqual(5, array.Length);
-            Assert.AreEqual(1, array[0]);
-            Assert.AreEqual(4, array[4]);
-            Assert.IsTrue(array[1..4].All(x => x == null));
+            Assert.That(array.Length, Is.EqualTo(5));
+            Assert.That(array[0], Is.EqualTo(1));
+            Assert.That(array[4], Is.EqualTo(4));
+            Assert.That(array[1..4].All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_WithIndexAndLength_ShouldClearTheSpecifiedRangeOfTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear(1, 3);
 
-            Assert.AreEqual(5, array.Length);
-            Assert.AreEqual(1, array[0]);
-            Assert.AreEqual(4, array[4]);
-            Assert.IsTrue(array[1..4].All(x => x == null));
+            Assert.That(array.Length, Is.EqualTo(5));
+            Assert.That(array[0], Is.EqualTo(1));
+            Assert.That(array[4], Is.EqualTo(4));
+            Assert.That(array[1..4].All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_ShouldThrowArgumentNullException_WhenArrayIsNull()
         {
             int[] array = null!;
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear());
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear(0, 1));
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear(..1));
+            Assert.Throws<ArgumentNullException>(() => array.Clear());
+            Assert.Throws<ArgumentNullException>(() => array.Clear(0, 1));
+            Assert.Throws<ArgumentNullException>(() => array.Clear(..1));
         }
     }
 }

X10D.Tests/src/Collections/ArrayTests.cs

@@ -1,8 +1,8 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public partial class ArrayTests
+[TestFixture]
+internal static partial class ArrayTests
 {
 }

X10D.Tests/src/Collections/BoolListTests.cs

@@ -1,56 +1,56 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class BoolListTests
+[TestFixture]
+internal class BoolListTests
 {
-    [TestMethod]
+    [Test]
     public void PackByte_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false};
-        Assert.AreEqual(85, array.PackByte()); // 01010101
+        Assert.That(array.PackByte(), Is.EqualTo(85)); // 01010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack16Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt16()); // 101101010101
+        Assert.That(array.PackInt16(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack32Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt32()); // 101101010101
+        Assert.That(array.PackInt32(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack64Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt64()); // 101101010101
+        Assert.That(array.PackInt64(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack_ShouldThrow_GivenLargeArray()
     {
         bool[] array = Enumerable.Repeat(false, 65).ToArray();
-        Assert.ThrowsException<ArgumentException>(() => array.PackByte());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt16());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt32());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt64());
+        Assert.Throws<ArgumentException>(() => _ = array.PackByte());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt16());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt32());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt64());
     }
 
-    [TestMethod]
+    [Test]
     public void Pack_ShouldThrow_GivenNull()
     {
-        bool[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackByte());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt64());
+        bool[] array = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackByte());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt16());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt32());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt64());
     }
 }

X10D.Tests/src/Collections/ByteTests.cs

@@ -1,67 +1,74 @@
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class ByteTests
+[TestFixture]
+internal class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
         const byte value = 0b11010100;
         bool[] bits = value.Unpack();
 
-        Assert.AreEqual(8, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+        Assert.That(bits, Has.Length.EqualTo(8));
+        Assert.Multiple(() =>
+        {
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.Unpack(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.Unpack(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
 #if NET5_0_OR_GREATER
-
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Fallback_ShouldUnpackToSpanCorrectly()
     {
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.UnpackInternal_Fallback(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.UnpackInternal_Fallback(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Sse3.IsSupported)
@@ -70,31 +77,34 @@ public class ByteTests
         }
 
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.UnpackInternal_Ssse3(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.Unpack(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const byte value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackByte());
+        Assert.That(value.Unpack().PackByte(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const byte value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs

@@ -1,45 +1,46 @@
 using System.Collections.ObjectModel;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using NSubstitute;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class CollectionTests
+internal partial class CollectionTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearAndDisposeAllTests
     {
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IDisposable>();
-            var mock2 = new Mock<IDisposable>();
-            var mock3 = new Mock<IDisposable>();
-            var list = new List<IDisposable> {mock1.Object, mock2.Object, mock3.Object};
+            var substitute1 = Substitute.For<IDisposable>();
+            var substitute2 = Substitute.For<IDisposable>();
+            var substitute3 = Substitute.For<IDisposable>();
+            var list = new List<IDisposable> {substitute1, substitute2, substitute3};
 
             list.ClearAndDisposeAll();
 
-            mock1.Verify(i => i.Dispose(), Times.Once);
-            mock2.Verify(i => i.Dispose(), Times.Once);
-            mock3.Verify(i => i.Dispose(), Times.Once);
-            Assert.AreEqual(0, list.Count);
+            substitute1.Received(1).Dispose();
+            substitute2.Received(1).Dispose();
+            substitute3.Received(1).Dispose();
+
+            Assert.That(list, Is.Empty);
         }
 
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
             List<IDisposable>? list = null;
-            Assert.ThrowsException<ArgumentNullException>(() => list!.ClearAndDisposeAll());
+            Assert.Throws<ArgumentNullException>(() => list!.ClearAndDisposeAll());
         }
 
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
-            var mock = new Mock<IDisposable>();
-            var list = new ReadOnlyCollection<IDisposable>(new List<IDisposable> {mock.Object});
+            var substitute = Substitute.For<IDisposable>();
+            var list = new ReadOnlyCollection<IDisposable>(new List<IDisposable> {substitute});
 
-            Assert.ThrowsException<InvalidOperationException>(() => list.ClearAndDisposeAll());
+            Assert.Throws<InvalidOperationException>(() => list.ClearAndDisposeAll());
         }
     }
 }

X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs

@@ -1,45 +1,46 @@
 using System.Collections.ObjectModel;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using NSubstitute;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class CollectionTests
+internal partial class CollectionTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearAndDisposeAllAsyncTests
     {
-        [TestMethod]
+        [Test]
         public async Task ClearAndDisposeAllAsync_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IAsyncDisposable>();
-            var mock2 = new Mock<IAsyncDisposable>();
-            var mock3 = new Mock<IAsyncDisposable>();
-            var list = new List<IAsyncDisposable> {mock1.Object, mock2.Object, mock3.Object};
+            var substitute1 = Substitute.For<IAsyncDisposable>();
+            var substitute2 = Substitute.For<IAsyncDisposable>();
+            var substitute3 = Substitute.For<IAsyncDisposable>();
+            var list = new List<IAsyncDisposable> {substitute1, substitute2, substitute3};
 
             await list.ClearAndDisposeAllAsync().ConfigureAwait(false);
 
-            mock1.Verify(i => i.DisposeAsync(), Times.Once);
-            mock2.Verify(i => i.DisposeAsync(), Times.Once);
-            mock3.Verify(i => i.DisposeAsync(), Times.Once);
-            Assert.AreEqual(0, list.Count);
+            await substitute1.Received(1).DisposeAsync();
+            await substitute2.Received(1).DisposeAsync();
+            await substitute3.Received(1).DisposeAsync();
+
+            Assert.That(list, Is.Empty);
         }
 
-        [TestMethod]
-        public async Task ClearAndDisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
+        [Test]
+        public void ClearAndDisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
             List<IAsyncDisposable>? list = null;
-            await Assert.ThrowsExceptionAsync<ArgumentNullException>(list!.ClearAndDisposeAllAsync).ConfigureAwait(false);
+            Assert.ThrowsAsync<ArgumentNullException>(list!.ClearAndDisposeAllAsync);
         }
 
-        [TestMethod]
-        public async Task ClearAndDisposeAllAsync_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
+        [Test]
+        public void ClearAndDisposeAllAsync_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
-            var mock = new Mock<IAsyncDisposable>();
-            var list = new ReadOnlyCollection<IAsyncDisposable>(new List<IAsyncDisposable> {mock.Object});
+            var substitute = Substitute.For<IAsyncDisposable>();
+            var list = new ReadOnlyCollection<IAsyncDisposable>(new List<IAsyncDisposable> {substitute});
 
-            await Assert.ThrowsExceptionAsync<InvalidOperationException>(list.ClearAndDisposeAllAsync).ConfigureAwait(false);
+            Assert.ThrowsAsync<InvalidOperationException>(list.ClearAndDisposeAllAsync);
         }
     }
 }

X10D.Tests/src/Collections/CollectionTests.cs

@@ -1,8 +1,8 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public partial class CollectionTests
+[TestFixture]
+internal partial class CollectionTests
 {
 }

X10D.Tests/src/Collections/DictionaryTests.cs

@@ -1,176 +1,231 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class DictionaryTests
+[TestFixture]
+internal class DictionaryTests
 {
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldAddNewKey_IfNotExists_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, _ => "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, (_, _) => "one", (_, _, _) => string.Empty, 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldAddNewKey_IfNotExists_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, _ => "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, (_, _) => "one", (_, _, _) => string.Empty, 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldUpdateKey_IfExists_GivenConcreteDirection()
     {
         var dictionary = new Dictionary<int, string> {[1] = "one"};
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.AddOrUpdate(1, string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
+
         dictionary[1] = "one";
-
         dictionary.AddOrUpdate(1, _ => string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
         dictionary[1] = "one";
 
         dictionary.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => "two", 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldUpdateKey_IfExists_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string> {[1] = "one"};
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.AddOrUpdate(1, string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
-        dictionary[1] = "one";
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary, Is.Empty);
+            Assert.That(dictionary.ContainsKey(1), Is.False);
+        });
 
+        dictionary[1] = "one";
         dictionary.AddOrUpdate(1, _ => string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
-        dictionary[1] = "one";
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary, Is.Empty);
+            Assert.That(dictionary.ContainsKey(1), Is.False);
+            dictionary[1] = "one";
+        });
 
         dictionary.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => "two", 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullDictionary_GivenConcreteDictionary()
     {
         Dictionary<int, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, _ => string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => string.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullDictionary_GivenIDictionary()
     {
         IDictionary<int, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, _ => string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => string.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullUpdateValueFactory_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullUpdateValueFactory_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullAddValueFactory_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
         Func<int, string>? addValueFactory = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullAddValueFactory_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
         Func<int, string>? addValueFactory = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -179,10 +234,10 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString();
-        Assert.AreEqual("Data Source=localhost;Initial Catalog=test;Integrated Security=True;Foobar=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("Data Source=localhost;Initial Catalog=test;Integrated Security=True;Foobar="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnTransformedValueConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -191,10 +246,10 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString(v => v?.ToUpperInvariant());
-        Assert.AreEqual("Data Source=LOCALHOST;Initial Catalog=TEST;Integrated Security=TRUE;Foobar=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("Data Source=LOCALHOST;Initial Catalog=TEST;Integrated Security=TRUE;Foobar="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnTransformedKeyValueConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -203,69 +258,69 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString(k => k.ToUpper(), v => v?.ToUpperInvariant());
-        Assert.AreEqual("DATA SOURCE=LOCALHOST;INITIAL CATALOG=TEST;INTEGRATED SECURITY=TRUE;FOOBAR=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("DATA SOURCE=LOCALHOST;INITIAL CATALOG=TEST;INTEGRATED SECURITY=TRUE;FOOBAR="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldThrow_GivenNullSource()
     {
-        Dictionary<string, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString());
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString(null!, null!));
+        Dictionary<string, string> dictionary = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString());
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldThrow_GivenNullSelector()
     {
         var dictionary = new Dictionary<string, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(null!, _ => _));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(_ => _, null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!, _ => _));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(_ => _, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnParameters()
     {
         var dictionary = new Dictionary<string, string> {["id"] = "1", ["user"] = "hello world", ["foo"] = "bar"};
 
         string queryString = dictionary.ToGetParameters();
-        Assert.AreEqual("id=1&user=hello+world&foo=bar", queryString);
+        Assert.That(queryString, Is.EqualTo("id=1&user=hello+world&foo=bar"));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnTransformedValueParameters()
     {
         var dictionary = new Dictionary<string, string?> {["id"] = "1", ["user"] = "hello world", ["foo"] = null};
 
         string queryString = dictionary.ToGetParameters(v => v?.ToUpper());
-        Assert.AreEqual("id=1&user=HELLO+WORLD&foo=", queryString);
+        Assert.That(queryString, Is.EqualTo("id=1&user=HELLO+WORLD&foo="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnTransformedKeyValueParameters()
     {
         var dictionary = new Dictionary<string, string?> {["id"] = "1", ["user"] = "hello world", ["foo"] = null};
 
         string queryString = dictionary.ToGetParameters(k => k.ToUpper(), v => v?.ToUpper());
-        Assert.AreEqual("ID=1&USER=HELLO+WORLD&FOO=", queryString);
+        Assert.That(queryString, Is.EqualTo("ID=1&USER=HELLO+WORLD&FOO="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldThrow_GivenNullSource()
     {
-        Dictionary<string, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters());
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters(null!, null!));
+        Dictionary<string, string> dictionary = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters());
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldThrow_GivenNullSelector()
     {
         var dictionary = new Dictionary<string, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(null!, _ => _));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(_ => _, null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!, _ => _));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(_ => _, null!));
     }
 }

X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs

@@ -1,34 +1,34 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using NSubstitute;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class EnumerableTests
+internal partial class EnumerableTests
 {
-    [TestClass]
+    [TestFixture]
     public class DisposeAllTests
     {
-        [TestMethod]
+        [Test]
         public void DisposeAll_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IDisposable>();
-            var mock2 = new Mock<IDisposable>();
-            var mock3 = new Mock<IDisposable>();
-            var list = new List<IDisposable> {mock1.Object, mock2.Object, null!, mock3.Object};
+            var substitute1 = Substitute.For<IDisposable>();
+            var substitute2 = Substitute.For<IDisposable>();
+            var substitute3 = Substitute.For<IDisposable>();
+            var list = new List<IDisposable> { substitute1, substitute2, null!, substitute3 };
 
             list.DisposeAll();
 
-            mock1.Verify(i => i.Dispose(), Times.Once);
-            mock2.Verify(i => i.Dispose(), Times.Once);
-            mock3.Verify(i => i.Dispose(), Times.Once);
+            substitute1.Received(1).Dispose();
+            substitute2.Received(1).Dispose();
+            substitute3.Received(1).Dispose();
         }
 
-        [TestMethod]
+        [Test]
         public void DisposeAll_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
-            List<IDisposable>? list = null;
-            Assert.ThrowsException<ArgumentNullException>(() => list!.DisposeAll());
+            List<IDisposable> list = null!;
+            Assert.Throws<ArgumentNullException>(() => list.DisposeAll());
         }
     }
 }

X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs

@@ -1,34 +1,34 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using NSubstitute;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-public partial class EnumerableTests
+internal partial class EnumerableTests
 {
-    [TestClass]
+    [TestFixture]
     public class DisposeAllAsyncTests
     {
-        [TestMethod]
+        [Test]
         public async Task DisposeAllAsync_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IAsyncDisposable>();
-            var mock2 = new Mock<IAsyncDisposable>();
-            var mock3 = new Mock<IAsyncDisposable>();
-            var list = new List<IAsyncDisposable> {mock1.Object, mock2.Object, null!, mock3.Object};
+            var substitute1 = Substitute.For<IAsyncDisposable>();
+            var substitute2 = Substitute.For<IAsyncDisposable>();
+            var substitute3 = Substitute.For<IAsyncDisposable>();
+            var list = new List<IAsyncDisposable> { substitute1, substitute2, null!, substitute3 };
 
             await list.DisposeAllAsync().ConfigureAwait(false);
 
-            mock1.Verify(i => i.DisposeAsync(), Times.Once);
-            mock2.Verify(i => i.DisposeAsync(), Times.Once);
-            mock3.Verify(i => i.DisposeAsync(), Times.Once);
+            await substitute1.Received(1).DisposeAsync();
+            await substitute2.Received(1).DisposeAsync();
+            await substitute3.Received(1).DisposeAsync();
         }
 
-        [TestMethod]
-        public async Task DisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
+        [Test]
+        public void DisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
-            List<IAsyncDisposable>? list = null;
-            await Assert.ThrowsExceptionAsync<ArgumentNullException>(() => list!.DisposeAllAsync()).ConfigureAwait(false);
+            List<IAsyncDisposable> list = null!;
+            Assert.ThrowsAsync<ArgumentNullException>(() => list.DisposeAllAsync());
         }
     }
 }

X10D.Tests/src/Collections/EnumerableTests.cs

@@ -1,33 +1,33 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 using X10D.Core;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public partial class EnumerableTests
+[TestFixture]
+internal partial class EnumerableTests
 {
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldReturnCorrectCount_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int count = enumerable.CountWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(2, count);
+        Assert.That(count, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.CountWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.CountWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().CountWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => Enumerable.Empty<int>().CountWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowOverflowException_GivenLargeSource()
     {
         IEnumerable<byte> GetValues()
@@ -40,76 +40,76 @@ public partial class EnumerableTests
             // ReSharper disable once IteratorNeverReturns
         }
 
-        Assert.ThrowsException<OverflowException>(() => GetValues().CountWhereNot(x => x % 2 == 0));
+        Assert.Throws<OverflowException>(() => _ = GetValues().CountWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.FirstWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(7, result);
+        Assert.That(result, Is.EqualTo(7));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Range(0, 1).FirstWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Range(0, 1).FirstWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = Enumerable.Empty<int>().FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowInvalidOperationException_GivenSourceWithNoMatchingElements()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => 2.AsArrayValue().FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = 2.AsArrayValue().FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(7, result);
+        Assert.That(result, Is.EqualTo(7));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.FirstWhereNotOrDefault(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.FirstWhereNotOrDefault(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().FirstWhereNotOrDefault(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Empty<int>().FirstWhereNotOrDefault(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnDefault_GivenEmptySource()
     {
         int result = Enumerable.Empty<int>().FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnDefault_GivenSourceWithNoMatchingElements()
     {
         int result = 2.AsArrayValue().FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldTransform_GivenTransformationDelegate()
     {
         var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
@@ -124,21 +124,21 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(multipliedByIndex, values.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldThrow_GivenNullSource()
     {
         IEnumerable<object>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.For((_, _) => { }));
+        Assert.Throws<ArgumentNullException>(() => source!.For((_, _) => { }));
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldThrow_GivenNullAction()
     {
         IEnumerable<object> source = ArraySegment<object>.Empty;
-        Assert.ThrowsException<ArgumentNullException>(() => source.For(null!));
+        Assert.Throws<ArgumentNullException>(() => source.For(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldTransform_GivenTransformationDelegate()
     {
         var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
@@ -153,93 +153,93 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(oneToTenDoubled, values.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldThrow_GivenNullSource()
     {
         IEnumerable<object>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.ForEach(_ => { }));
+        Assert.Throws<ArgumentNullException>(() => source!.ForEach(_ => { }));
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldThrow_GivenNullAction()
     {
         IEnumerable<object> source = ArraySegment<object>.Empty;
-        Assert.ThrowsException<ArgumentNullException>(() => source.ForEach(null!));
+        Assert.Throws<ArgumentNullException>(() => source.ForEach(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.LastWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(9, result);
+        Assert.That(result, Is.EqualTo(9));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Array.Empty<int>().LastWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Array.Empty<int>().LastWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = Array.Empty<int>().LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowInvalidOperationException_GivenSourceWithNoMatchingElements()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => 2.AsArrayValue().LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = 2.AsArrayValue().LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(9, result);
+        Assert.That(result, Is.EqualTo(9));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.LastWhereNotOrDefault(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.LastWhereNotOrDefault(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Array.Empty<int>().LastWhereNotOrDefault(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Array.Empty<int>().LastWhereNotOrDefault(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnDefault_GivenEmptySource()
     {
         int result = Array.Empty<int>().LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnDefault_GivenSourceWithNoMatchingElements()
     {
         int result = 2.AsArrayValue().LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffled_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Shuffled());
+        Assert.Throws<ArgumentNullException>(() => _ = ((List<int>?)null)!.Shuffled());
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffled_ShouldReorder_GivenNotNull()
     {
         int[] array = Enumerable.Range(1, 52).ToArray(); // 52! chance of being shuffled to the same order
@@ -251,7 +251,7 @@ public partial class EnumerableTests
         CollectionAssert.AreNotEqual(array, shuffled);
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
@@ -259,19 +259,19 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(new[] {7, 9}, result.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.WhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.WhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().WhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Empty<int>().WhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNotNull_ShouldContainNoNullElements()
     {
         object?[] array = Enumerable.Repeat(new object(), 10).ToArray();
@@ -289,14 +289,14 @@ public partial class EnumerableTests
             actualCount++;
         }
 
-        Assert.AreEqual(expectedCount, actualCount);
+        Assert.That(actualCount, Is.EqualTo(expectedCount));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNotNull_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<string> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.WhereNotNull());
+        Assert.Throws<ArgumentNullException>(() => source.WhereNotNull());
     }
 
     private class DummyClass

X10D.Tests/src/Collections/Int16Tests.cs

@@ -1,119 +1,133 @@
-using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+#if NET5_0_OR_GREATER
+using System.Runtime.Intrinsics.X86;
+#endif
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class Int16Tests
+[TestFixture]
+internal class Int16Tests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
-        const short value = 0b11010100;
-        bool[] bits = value.Unpack();
-
-        Assert.AreEqual(16, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            const short value = 0b11010100;
+            bool[] bits = value.Unpack();
+
+            Assert.That(bits, Has.Length.EqualTo(16));
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly_GivenFallbackImplementation()
     {
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.UnpackInternal_Fallback(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.UnpackInternal_Fallback(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Sse3.IsSupported)
         {
+            Assert.Pass();
             return;
         }
 
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.UnpackInternal_Ssse3(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.UnpackInternal_Ssse3(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const short value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackInt16());
+        Assert.That(value.Unpack().PackInt16(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const short value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/Int32Tests.cs

@@ -1,81 +1,92 @@
-using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+#if NET5_0_OR_GREATER
+using System.Runtime.Intrinsics.X86;
+#endif
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class Int32Tests
+[TestFixture]
+internal class Int32Tests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
         const int value = 0b11010100;
-        bool[] bits = value.Unpack();
 
-        Assert.AreEqual(32, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            bool[] bits = value.Unpack();
+            Assert.That(bits, Has.Length.EqualTo(32));
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Fallback_ShouldUnpackToSpanCorrectly()
     {
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Fallback(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Fallback(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Ssse3.IsSupported)
@@ -84,25 +95,28 @@ public class Int32Tests
         }
 
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Ssse3(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Ssse3(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Avx2_ShouldUnpackToSpanCorrectly()
     {
         if (!Avx2.IsSupported)
@@ -111,36 +125,39 @@ public class Int32Tests
         }
 
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Avx2(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Avx2(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const int value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackInt32());
+        Assert.That(value.Unpack().PackInt32(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const int value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/Int64Tests.cs

@@ -1,68 +1,74 @@
 using System.Diagnostics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Globalization;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class Int64Tests
+[TestFixture]
+internal class Int64Tests
 {
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldUnpackToArrayCorrectly()
     {
         bool[] bits = 0b11010100L.Unpack();
 
-        Assert.AreEqual(64, bits.Length);
+        Assert.That(bits, Has.Length.EqualTo(64));
 
         Trace.WriteLine(Convert.ToString(0b11010100L, 2));
         Trace.WriteLine(string.Join("", bits.Select(b => b ? "1" : "0")));
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 64; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index], index.ToString());
-        }
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 64; index++)
+            {
+                Assert.That(bits[index], Is.False, index.ToString(CultureInfo.InvariantCulture));
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldUnpackToSpanCorrectly()
     {
-        Span<bool> bits = stackalloc bool[64];
-        0b11010100L.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 64; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index], index.ToString());
-        }
+            Span<bool> bits = stackalloc bool[64];
+            0b11010100L.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 64; index++)
+            {
+                Assert.That(bits[index], Is.False, index.ToString(CultureInfo.InvariantCulture));
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldRepackEqually()
     {
-        Assert.AreEqual(0b11010100L, 0b11010100L.Unpack().PackInt64());
+        Assert.That(0b11010100L.Unpack().PackInt64(), Is.EqualTo(0b11010100L));
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> bits = stackalloc bool[0];
             0b11010100L.Unpack(bits);

X10D.Tests/src/Collections/ListTests.cs

@@ -1,16 +1,15 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class ListTests
+[TestFixture]
+internal class ListTests
 {
-    [CLSCompliant(false)]
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow(1, 2, 3)]
-    [DataRow(1, 2, 3, 4, 5)]
+        [Test]
+    [TestCase(1)]
+    [TestCase(1, 2, 3)]
+    [TestCase(1, 2, 3, 4, 5)]
     public void Fill_ShouldGiveHomogenousList_GivenValue(params int[] args)
     {
         int[] all42 = Enumerable.Repeat(42, args.Length).ToArray();
@@ -26,155 +25,169 @@ public class ListTests
         CollectionAssert.AreEqual(all42, list);
     }
 
-    [CLSCompliant(false)]
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow(1, 2, 3)]
-    [DataRow(1, 2, 3, 4, 5)]
+        [Test]
+    [TestCase(1)]
+    [TestCase(1, 2, 3)]
+    [TestCase(1, 2, 3, 4, 5)]
     public void SlicedFill_ShouldLeaveFirstElement_GivenStartIndex1(params int[] args)
     {
         int first = args[0];
         args.Fill(1, 1, args.Length - 1);
 
         int[] comparison = Enumerable.Repeat(1, args.Length - 1).ToArray();
-        Assert.AreEqual(first, args[0]);
+        Assert.That(args[0], Is.EqualTo(first));
         CollectionAssert.AreEqual(comparison, args[1..]);
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenExceededCount()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, 0, 1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, 0, 1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, 0, 1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, 0, 1));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, 0, -1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, 0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, -1, 0));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, -1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, -1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, -1, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNull()
     {
         int[]? array = null;
         List<int>? list = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Fill(0));
-        Assert.ThrowsException<ArgumentNullException>(() => list!.Fill(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Fill(0, 0, 0));
-        Assert.ThrowsException<ArgumentNullException>(() => list!.Fill(0, 0, 0));
+        Assert.Throws<ArgumentNullException>(() => array!.Fill(0));
+        Assert.Throws<ArgumentNullException>(() => list!.Fill(0));
+        Assert.Throws<ArgumentNullException>(() => array!.Fill(0, 0, 0));
+        Assert.Throws<ArgumentNullException>(() => list!.Fill(0, 0, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnCorrectValue_FromStartOfList()
     {
         int[] array = {0, 1, 2, 3, 4};
-        Assert.AreEqual(2, array.IndexOf(2));
-        Assert.AreEqual(2, array.IndexOf(2, 0));
-        Assert.AreEqual(2, array.IndexOf(2, 0, 5));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(2), Is.EqualTo(2));
+            Assert.That(array.IndexOf(2, 0), Is.EqualTo(2));
+            Assert.That(array.IndexOf(2, 0, 5), Is.EqualTo(2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnCorrectValue_GivenSubRange()
     {
         int[] array = {0, 1, 2, 3, 4, 0};
-        Assert.AreEqual(0, array.IndexOf(0));
-        Assert.AreEqual(0, array.IndexOf(0, 0));
-        Assert.AreEqual(0, array.IndexOf(0, 0, 5));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(0), Is.Zero);
+            Assert.That(array.IndexOf(0, 0), Is.Zero);
+            Assert.That(array.IndexOf(0, 0, 5), Is.Zero);
 
-        Assert.AreEqual(5, array.IndexOf(0, 1));
-        Assert.AreEqual(5, array.IndexOf(0, 1, 5));
+            Assert.That(array.IndexOf(0, 1), Is.EqualTo(5));
+            Assert.That(array.IndexOf(0, 1, 5), Is.EqualTo(5));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnNegative1_ForEmptyList()
     {
         int[] array = Array.Empty<int>();
-        Assert.AreEqual(-1, array.IndexOf(0));
-        Assert.AreEqual(-1, array.IndexOf(0, 0));
-        Assert.AreEqual(-1, array.IndexOf(0, 0, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(0), Is.EqualTo(-1));
+            Assert.That(array.IndexOf(0, 0), Is.EqualTo(-1));
+            Assert.That(array.IndexOf(0, 0, 0), Is.EqualTo(-1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentNullException_GivenNullList()
     {
         int[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0, 0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0, 0, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0));
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0, 0));
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0, 0, 0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, 0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1));
+            Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1, 0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenInvalidStartIndexCountPair()
     {
         int[] array = {0, 1, 2};
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, 2, 4));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, 2, 4));
     }
 
-    [TestMethod]
+    [Test]
     public void Random_ShouldReturnContainedObject_GivenNotNull()
     {
         var list = new List<int>(Enumerable.Range(1, 52)); // 52! chance of being shuffled to the same order
         int random = list.Random();
 
-        Assert.IsTrue(list.Contains(random));
+        Assert.That(list, Does.Contain(random));
     }
 
-    [TestMethod]
+    [Test]
     public void Random_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Random());
+        Assert.Throws<ArgumentNullException>(() => _ = ((List<int>?)null)!.Random());
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentNullException_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.RemoveRange(new Range()));
+        Assert.Throws<ArgumentNullException>(() => ((List<int>?)null)!.RemoveRange(new Range()));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentException_GivenEndIndexLessThanStart()
     {
-        Assert.ThrowsException<ArgumentException>(() => new List<int>().RemoveRange(2..0));
+        Assert.Throws<ArgumentException>(() => new List<int>().RemoveRange(2..0));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentOutOfRangeException_GivenEndIndexGreaterThanOrEqualToCount()
     {
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => new List<int>().RemoveRange(..0));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => new List<int> {1}.RemoveRange(..2));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new List<int>().RemoveRange(..0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new List<int> {1}.RemoveRange(..2));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldRemoveElements_GivenList()
     {
         var list = new List<int>
@@ -191,13 +204,14 @@ public class ListTests
             10
         };
 
-        Assert.AreEqual(10, list.Count);
+        Assert.That(list, Has.Count.EqualTo(10));
         list.RemoveRange(2..5);
-        Assert.AreEqual(6, list.Count);
+
+        Assert.That(list, Has.Count.EqualTo(6));
         CollectionAssert.AreEqual(new[] {1, 2, 7, 8, 9, 10}, list);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffle_ShouldReorder_GivenNotNull()
     {
         var list = new List<int>(Enumerable.Range(1, 52)); // 52! chance of being shuffled to the same order
@@ -210,27 +224,27 @@ public class ListTests
         CollectionAssert.AreNotEqual(list, shuffled);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffle_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Shuffle());
+        Assert.Throws<ArgumentNullException>(() => ((List<int>?)null)!.Shuffle());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnCorrectValue_GivenStartIndex()
     {
         int[] array = {0, 1, 2, 3, 4, 5};
         CollectionAssert.AreEqual(new[] {2, 3, 4, 5}, array.Slice(2).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnCorrectValue_GivenStartIndexAndLength()
     {
         int[] array = {0, 1, 2, 3, 4, 5};
         CollectionAssert.AreEqual(new[] {2, 3, 4}, array.Slice(2, 3).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnEmptyList_ForEmptyList()
     {
         int[] array = Array.Empty<int>();
@@ -238,49 +252,49 @@ public class ListTests
         CollectionAssert.AreEqual(Array.Empty<int>(), array.Slice(0, 0).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentNullException_GivenNullList()
     {
         int[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0, 0));
+        Assert.Throws<ArgumentNullException>(() => array!.Slice(0));
+        Assert.Throws<ArgumentNullException>(() => array!.Slice(0, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(-1, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenInvalidStartIndexCountPair()
     {
         int[] array = {0, 1, 2};
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(2, 4));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(2, 4));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IList<int>?)null)!.Swap(new List<int>()));
+        Assert.Throws<ArgumentNullException>(() => ((IList<int>?)null)!.Swap(new List<int>()));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldThrowArgumentNullException_GivenNullTarget()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => new List<int>().Swap(null!));
+        Assert.Throws<ArgumentNullException>(() => new List<int>().Swap(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldSwapElements_GivenMatchingElementCount()
     {
         var first = new List<int> {1, 2, 3};
@@ -297,7 +311,7 @@ public class ListTests
         CollectionAssert.AreEqual(new[] {4, 5, 6}, second, string.Join(' ', second));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldSwapElements_GivenDifferentElementCount()
     {
         var first = new List<int>

X10D.Tests/src/Collections/SpanTest.cs

@@ -1,52 +1,76 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
-public class SpanTest
+[TestFixture]
+internal class SpanTest
 {
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptySpan()
     {
         Span<int> span = Span<int>.Empty;
 
         int count = span.Count(2);
 
-        Assert.AreEqual(0, count);
+        Assert.That(count, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptyReadOnlySpan()
     {
         ReadOnlySpan<int> span = ReadOnlySpan<int>.Empty;
 
         int count = span.Count(2);
 
-        Assert.AreEqual(0, count);
+        Assert.That(count, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn8_GivenSpanWith8MatchingElements()
     {
         Span<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
 
         int count = span.Count(2);
 
-        Assert.AreEqual(8, count);
+        Assert.That(count, Is.EqualTo(8));
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn8_GivenReadOnlySpanWith8MatchingElements()
     {
         ReadOnlySpan<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
 
         int count = span.Count(2);
 
-        Assert.AreEqual(8, count);
+        Assert.That(count, Is.EqualTo(8));
     }
 
-    [TestMethod]
+    [Test]
+    public void Replace_ShouldReplaceAllElements_GivenSpanOfInt32()
+    {
+        Span<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
+        span.Replace(2, 4);
+        Assert.That(span.ToArray(), Is.EqualTo(new[] {1, 4, 3, 4, 5, 4, 7, 4, 9, 4, 11, 4, 13, 4, 15, 4}));
+    }
+
+    [Test]
+    public void Replace_ShouldReplaceAllElements_GivenSpanOfChar()
+    {
+        Span<char> chars = stackalloc char[12] {'H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!'};
+        chars.Replace('l', 'w');
+        CollectionAssert.AreEqual(chars.ToArray(), "Hewwo worwd!".ToCharArray());
+    }
+
+    [Test]
+    public void Replace_ShouldDoNothing_GivenSpanWithNoMatchingElements()
+    {
+        Span<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
+        span.Replace(4, 8);
+        Assert.That(span.ToArray(), Is.EqualTo(new[] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2}));
+    }
+
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = ReadOnlySpan<char>.Empty;
@@ -57,10 +81,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingCharDelimiter_GivenSpan()
     {
         Span<char> span = Span<char>.Empty;
@@ -71,10 +95,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = ReadOnlySpan<char>.Empty;
@@ -85,10 +109,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingStringDelimiter_GivenSpan()
     {
         Span<char> span = Span<char>.Empty;
@@ -99,10 +123,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello ".AsSpan();
@@ -112,16 +136,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello ".AsSpan();
@@ -133,16 +157,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello ".AsSpan();
@@ -152,16 +176,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello ".AsSpan();
@@ -173,16 +197,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello".AsSpan();
@@ -192,16 +216,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello".AsSpan();
@@ -213,16 +237,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello".AsSpan();
@@ -232,16 +256,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello".AsSpan();
@@ -253,16 +277,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello World ".AsSpan();
@@ -273,20 +297,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello World ".AsSpan();
@@ -299,20 +323,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello World ".AsSpan();
@@ -323,20 +347,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello World ".AsSpan();
@@ -349,20 +373,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello, the World ".AsSpan();
@@ -373,23 +397,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello, the World ".AsSpan();
@@ -402,23 +426,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello, the World ".AsSpan();
@@ -429,23 +453,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello, the World ".AsSpan();
@@ -458,19 +482,19 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 }

X10D.Tests/src/Core/CoreTests.cs

@@ -1,76 +1,78 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class CoreTests
+[TestFixture]
+internal class CoreTests
 {
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsArrayValue_ShouldBeLength1_GivenValue(object o)
     {
-        object[] array = o.AsArrayValue()!;
-        Assert.IsNotNull(array);
-        Assert.IsTrue(array.Length == 1);
+        object[] array = o.AsArrayValue();
+        Assert.That(array, Is.Not.Null);
+        Assert.That(array, Has.Length.EqualTo(1));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsArrayValue_ShouldContainValue_Given_Value(object o)
     {
-        object[] array = o.AsArrayValue()!;
-        Assert.IsNotNull(array);
-        Assert.AreEqual(o, array[0]);
+        object[] array = o.AsArrayValue();
+        Assert.That(array, Is.Not.Null);
+        Assert.That(array[0], Is.EqualTo(o));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsEnumerableValue_ShouldBeLength1_GivenValue(object o)
     {
-        IEnumerable<object> enumerable = o.AsEnumerableValue()!;
-        Assert.IsNotNull(enumerable);
-        Assert.IsTrue(enumerable.Count() == 1);
+        object[] enumerable = o.AsEnumerableValue().ToArray();
+        Assert.That(enumerable, Is.Not.Null);
+        Assert.That(enumerable, Has.Length.EqualTo(1));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsEnumerableValue_ShouldContainValue_Given_Value(object o)
     {
-        IEnumerable<object> enumerable = o.AsEnumerableValue()!;
-        Assert.IsNotNull(enumerable);
-        Assert.AreEqual(o, enumerable.ElementAt(0));
+        object[] enumerable = o.AsEnumerableValue().ToArray();
+        Assert.That(enumerable, Is.Not.Null);
+        Assert.That(enumerable.ElementAt(0), Is.EqualTo(o));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void RepeatValue_ShouldContainRepeatedValue_GivenValue(object o)
     {
         IEnumerable<object> enumerable = o.RepeatValue(10);
-        Assert.IsNotNull(enumerable);
+        // ReSharper disable once PossibleMultipleEnumeration
+        Assert.That(enumerable, Is.Not.Null);
 
+        // ReSharper disable once PossibleMultipleEnumeration
         object[] array = enumerable.ToArray();
-        Assert.AreEqual(10, array.Length);
+        Assert.That(array, Has.Length.EqualTo(10));
         CollectionAssert.AreEqual(new[] {o, o, o, o, o, o, o, o, o, o}, array);
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void RepeatValue_ShouldThrow_GivenNegativeCount(object o)
     {
         // we must force enumeration via ToArray() to ensure the exception is thrown
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => o.RepeatValue(-1).ToArray());
+        Assert.Throws<ArgumentOutOfRangeException>(() => _ = o.RepeatValue(-1).ToArray());
     }
 }

X10D.Tests/src/Core/EnumTests.cs

@@ -1,10 +1,10 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class EnumTests
+[TestFixture]
+internal class EnumTests
 {
     // Microsoft wrongfully decided to have Sunday be 0, Monday be 1, etc.
     // I personally hate this, Sunday is not the first day of the week.
@@ -12,51 +12,63 @@ public class EnumTests
     // but Microsoft can't fix this without breaking compatibility.
     // I have feelings...
 
-    [TestMethod]
+    [Test]
     public void Next()
     {
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Sunday.Next());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Monday.Next());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Tuesday.Next());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Wednesday.Next());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Thursday.Next());
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Friday.Next());
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Saturday.Next()); // Saturday is the "last" day. wrap to "first"
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.Next(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Monday.Next(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Tuesday.Next(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Wednesday.Next(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Thursday.Next(), Is.EqualTo(DayOfWeek.Friday));
+            Assert.That(DayOfWeek.Friday.Next(), Is.EqualTo(DayOfWeek.Saturday));
+            Assert.That(DayOfWeek.Saturday.Next(), Is.EqualTo(DayOfWeek.Sunday)); // Saturday is the "last" day. wrap to "first"
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void NextUnchecked()
     {
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Sunday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Monday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Tuesday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Wednesday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Thursday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Friday.NextUnchecked());
-        Assert.ThrowsException<IndexOutOfRangeException>(() => DayOfWeek.Saturday.NextUnchecked());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.NextUnchecked(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Monday.NextUnchecked(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Tuesday.NextUnchecked(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Wednesday.NextUnchecked(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Thursday.NextUnchecked(), Is.EqualTo(DayOfWeek.Friday));
+            Assert.That(DayOfWeek.Friday.NextUnchecked(), Is.EqualTo(DayOfWeek.Saturday));
+        });
+        Assert.Throws<IndexOutOfRangeException>(() => _ = DayOfWeek.Saturday.NextUnchecked());
     }
 
-    [TestMethod]
+    [Test]
     public void Previous()
     {
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Sunday.Previous()); // Sunday is the "first" day. wrap to "last"
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Monday.Previous());
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Tuesday.Previous());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Wednesday.Previous());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Thursday.Previous());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Friday.Previous());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Saturday.Previous());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.Previous(), Is.EqualTo(DayOfWeek.Saturday)); // Sunday is the "first" day. wrap to "last"
+            Assert.That(DayOfWeek.Monday.Previous(), Is.EqualTo(DayOfWeek.Sunday));
+            Assert.That(DayOfWeek.Tuesday.Previous(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Wednesday.Previous(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Thursday.Previous(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Friday.Previous(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Saturday.Previous(), Is.EqualTo(DayOfWeek.Friday));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PreviousUnchecked()
     {
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Monday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Tuesday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Wednesday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Thursday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Friday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Saturday.PreviousUnchecked());
-        Assert.ThrowsException<IndexOutOfRangeException>(() => DayOfWeek.Sunday.PreviousUnchecked());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Monday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Sunday));
+            Assert.That(DayOfWeek.Tuesday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Wednesday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Thursday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Friday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Saturday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Friday));
+        });
+        Assert.Throws<IndexOutOfRangeException>(() => _ = DayOfWeek.Sunday.PreviousUnchecked());
     }
 }

X10D.Tests/src/Core/IntrinsicTests.cs

@@ -1,15 +1,15 @@
 #if NET6_0_OR_GREATER
 using System.Runtime.Intrinsics;
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class IntrinsicTests
+[TestFixture]
+internal class IntrinsicTests
 {
-    [TestMethod]
+    [Test]
     public void CorrectBoolean_ShouldReturnExpectedVector64Result_GivenInputVector()
     {
         var inputVector = Vector64.Create(0, 1, 2, 0, 3, 0, 0, (byte)4);
@@ -17,10 +17,10 @@ public class IntrinsicTests
 
         Vector64<byte> result = inputVector.CorrectBoolean();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Fallback_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         var inputVector = Vector128.Create(0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0, 0, 7, (byte)8);
@@ -28,10 +28,10 @@ public class IntrinsicTests
 
         Vector128<byte> result = inputVector.CorrectBooleanInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Sse2_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         if (!Sse2.IsSupported)
@@ -44,10 +44,10 @@ public class IntrinsicTests
 
         Vector128<byte> result = inputVector.CorrectBooleanInternal_Sse2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Avx2_ShouldReturnExpectedVector256Result_GivenInputVector()
     {
         if (!Avx2.IsSupported)
@@ -62,10 +62,10 @@ public class IntrinsicTests
 
         Vector256<byte> result = inputVector.CorrectBooleanInternal_Avx2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Fallback_ShouldReturnExpectedVector256Result_GivenInputVector()
     {
         var inputVector = Vector256.Create(0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0, 0, 7, 8, 0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0,
@@ -75,10 +75,10 @@ public class IntrinsicTests
 
         Vector256<byte> result = inputVector.CorrectBooleanInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOr_ShouldReturnCombinedVector_GivenInputVector128OfUInt32()
     {
         Vector128<uint> left = Vector128.Create(1U, 2U, 3U, 4U);
@@ -87,10 +87,10 @@ public class IntrinsicTests
         Vector128<uint> expected = Vector128.Create(3U, 7U, 7U, 15U);
         Vector128<uint> actual = IntrinsicUtility.HorizontalOr(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOrInternal_Sse_ShouldReturnCombinedVector_GivenInputVector128OfInt32()
     {
         Vector128<int> left = Vector128.Create(1, 2, 3, 4);
@@ -99,10 +99,10 @@ public class IntrinsicTests
         Vector128<int> expected = Vector128.Create(3, 7, 7, 15);
         Vector128<int> actual = IntrinsicUtility.HorizontalOr_Sse(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOrInternal_Fallback_ShouldReturnCombinedVector_GivenInputVector128OfInt32()
     {
         Vector128<int> left = Vector128.Create(1, 2, 3, 4);
@@ -111,10 +111,10 @@ public class IntrinsicTests
         Vector128<int> expected = Vector128.Create(3, 7, 7, 15);
         Vector128<int> actual = IntrinsicUtility.HorizontalOrInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void Multiply_ShouldReturnMultipliedVector_GivenInputVector128OfInt64()
     {
         Vector128<long> left = Vector128.Create(6L, 4L);
@@ -123,10 +123,10 @@ public class IntrinsicTests
         Vector128<long> expected = Vector128.Create(12L, 12L);
         Vector128<long> actual = IntrinsicUtility.Multiply(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Sse2_ShouldReturnMultipliedVector_GivenInputVector128OfUInt64()
     {
         if (!Sse2.IsSupported)
@@ -140,10 +140,10 @@ public class IntrinsicTests
         Vector128<ulong> expected = Vector128.Create(12UL, 12UL);
         Vector128<ulong> actual = IntrinsicUtility.MultiplyInternal_Sse2(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Fallback_ShouldReturnMultipliedVector_GivenInputVector128OfUInt64()
     {
         Vector128<ulong> left = Vector128.Create(6UL, 4UL);
@@ -152,10 +152,10 @@ public class IntrinsicTests
         Vector128<ulong> expected = Vector128.Create(12UL, 12UL);
         Vector128<ulong> actual = IntrinsicUtility.MultiplyInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void Multiply_ShouldReturnMultipliedVector_GivenInputVector256OfInt64()
     {
         Vector256<long> left = Vector256.Create(4L, 6L, 8L, 10L);
@@ -164,10 +164,10 @@ public class IntrinsicTests
         Vector256<long> expected = Vector256.Create(8L, 18L, 32L, 50L);
         Vector256<long> actual = IntrinsicUtility.Multiply(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Avx2_ShouldReturnMultipliedVector_GivenInputVector256OfUInt64()
     {
         if (!Avx2.IsSupported)
@@ -181,10 +181,10 @@ public class IntrinsicTests
         Vector256<ulong> expected = Vector256.Create(8UL, 18UL, 32UL, 50UL);
         Vector256<ulong> actual = IntrinsicUtility.MultiplyInternal_Avx2(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Fallback_ShouldReturnMultipliedVector_GivenInputVector256OfUInt64()
     {
         Vector256<ulong> left = Vector256.Create(4UL, 6UL, 8UL, 10UL);
@@ -193,10 +193,10 @@ public class IntrinsicTests
         Vector256<ulong> expected = Vector256.Create(8UL, 18UL, 32UL, 50UL);
         Vector256<ulong> actual = IntrinsicUtility.MultiplyInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReverseElementsInternal_Fallback_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         var inputVector = Vector128.Create(42UL, 69UL);
@@ -204,10 +204,10 @@ public class IntrinsicTests
 
         Vector128<ulong> result = inputVector.ReverseElementsInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void ReverseElementsInternal_Sse2_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         if (!Sse2.IsSupported)
@@ -220,7 +220,7 @@ public class IntrinsicTests
 
         Vector128<ulong> result = inputVector.ReverseElementsInternal_Sse2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 }
 #endif

X10D.Tests/src/Core/NullableTests.cs

@@ -1,24 +1,30 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class NullableTests
+[TestFixture]
+internal class NullableTests
 {
-    [TestMethod]
+    [Test]
     public void TryGetValue_ShouldBeTrue_GivenValue()
     {
         int? value = 42;
-        Assert.IsTrue(value.TryGetValue(out int returnedValue));
-        Assert.AreEqual(value, returnedValue);
+        Assert.Multiple(() =>
+        {
+            Assert.That(value.TryGetValue(out int returnedValue));
+            Assert.That(returnedValue, Is.EqualTo(value.Value));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void TryGetValue_ShouldBeFalse_GivenNull()
     {
         int? value = null;
-        Assert.IsFalse(value.TryGetValue(out int returnedValue));
-        Assert.AreEqual(default, returnedValue);
+        Assert.Multiple(() =>
+        {
+            Assert.That(value.TryGetValue(out int returnedValue), Is.False);
+            Assert.That(returnedValue, Is.Zero);
+        });
     }
 }

X10D.Tests/src/Core/RandomTests.cs

@@ -1,121 +1,121 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class RandomTests
+[TestFixture]
+internal class RandomTests
 {
-    [TestMethod]
+    [Test]
     public void NextBoolean_ShouldBeFalse_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.IsFalse(random.NextBoolean());
+        Assert.That(random.NextBoolean(), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void NextBoolean_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextBoolean());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextBoolean());
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_ShouldBe101_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(101, random.NextByte());
+        Assert.That(random.NextByte(), Is.EqualTo(101));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_WithMax10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextByte(10));
+        Assert.That(random.NextByte(10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_WithMin0Max10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextByte(0, 10));
+        Assert.That(random.NextByte(0, 10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte());
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte());
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_WithMax10_ShouldBe3point9908097935797695_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.9908097935797695, random.NextDouble(10));
+        Assert.That(random.NextDouble(10), Is.EqualTo(3.9908097935797695));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_WithMin0Max10_ShouldBe3point9908097935797695_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.9908097935797695, random.NextDouble(0, 10));
+        Assert.That(random.NextDouble(0, 10), Is.EqualTo(3.9908097935797695));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextDouble(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextDouble(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextDouble(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextDouble(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextDouble(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextDouble(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenMaxLessThanMin()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentException>(() => random.NextDouble(0, -1));
+        Assert.Throws<ArgumentException>(() => random.NextDouble(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextEnum_ShouldBeTuesday_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(DayOfWeek.Tuesday, random.Next<DayOfWeek>());
+        Assert.That(random.Next<DayOfWeek>(), Is.EqualTo(DayOfWeek.Tuesday));
     }
 
-    [TestMethod]
+    [Test]
     public void NextEnum_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.Next<DayOfWeek>());
+        Assert.Throws<ArgumentNullException>(() => random!.Next<DayOfWeek>());
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextFrom(""));
+        Assert.Throws<ArgumentNullException>(() => random!.NextFrom(""));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldThrow_GivenNullSource()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentNullException>(() => random.NextFrom((string?)null!));
+        Assert.Throws<ArgumentNullException>(() => random.NextFrom((string?)null!));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldEnumerate_GivenNonList()
     {
         IEnumerable<int> Source()
@@ -124,168 +124,168 @@ public class RandomTests
         }
 
         var random = new Random(1234);
-        Assert.AreEqual(0, random.NextFrom(Source()));
+        Assert.That(random.NextFrom(Source()), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromSpan_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             Span<int> span = stackalloc int[1];
-            return random!.NextFrom(span);
+            _ = random!.NextFrom(span);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromReadOnlySpan_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             Span<int> span = stackalloc int[1];
-            return random!.NextFrom(span.AsReadOnly());
+            _ = random!.NextFrom(span.AsReadOnly());
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromSpan_ShouldReturnOnlyValue_GivenSpanWithLength1()
     {
         Span<int> span = stackalloc int[1];
         span[0] = 42;
 
         var random = new Random(1234);
-        Assert.AreEqual(42, random.NextFrom(span));
+        Assert.That(random.NextFrom(span), Is.EqualTo(42));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromReadOnlySpan_ShouldReturnOnlyValue_GivenSpanWithLength1()
     {
         Span<int> span = stackalloc int[1];
         span[0] = 42;
 
         var random = new Random(1234);
-        Assert.AreEqual(42, random.NextFrom(span.AsReadOnly()));
+        Assert.That(random.NextFrom(span.AsReadOnly()), Is.EqualTo(42));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldBe13076_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(13076, random.NextInt16());
+        Assert.That(random.NextInt16(), Is.EqualTo(13076));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_WithMax10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextInt16(10));
+        Assert.That(random.NextInt16(10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_WithMin0Max10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextInt16(0, 10));
+        Assert.That(random.NextInt16(0, 10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextInt16(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextInt16(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16());
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_WithMax10_ShouldBe3point99081_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.99081f, random.NextSingle(10));
+        Assert.That(random.NextSingle(10), Is.EqualTo(3.99081f));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_WithMin0Max10_ShouldBe3point99081_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.99081f, random.NextSingle(0, 10));
+        Assert.That(random.NextSingle(0, 10), Is.EqualTo(3.99081f));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle(0, 10));
 #if !NET6_0_OR_GREATER
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle());
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle());
 #endif
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextSingle(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextSingle(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenMaxLessThanMin()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentException>(() => random.NextSingle(0, -1));
+        Assert.Throws<ArgumentException>(() => random.NextSingle(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBe_kxiyiyvnqi_GivenSeed1234()
     {
         const string alphabet = "abcdefghijklmnopqrstuvwxyz";
 
         var random = new Random(1234);
-        Assert.AreEqual("kxiyiyvnqi", random.NextString(alphabet.ToCharArray(), 10));
+        Assert.That(random.NextString(alphabet.ToCharArray(), 10), Is.EqualTo("kxiyiyvnqi"));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBeEmpty_GivenLength0()
     {
         var random = new Random(1234);
-        Assert.AreEqual(string.Empty, random.NextString(ArraySegment<char>.Empty, 0));
+        Assert.That(random.NextString(ArraySegment<char>.Empty, 0), Is.EqualTo(string.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBeLength1_GivenLength1()
     {
         var random = new Random(1234);
-        Assert.AreEqual(1, random.NextString("hello world".ToCharArray(), 1).Length);
+        Assert.That(random.NextString("hello world".ToCharArray(), 1).Length, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextString(ArraySegment<char>.Empty, 0));
+        Assert.Throws<ArgumentNullException>(() => random!.NextString(ArraySegment<char>.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNullSource()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentNullException>(() => random.NextString(null!, 0));
+        Assert.Throws<ArgumentNullException>(() => random.NextString(null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNegativeLength()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextString(ArraySegment<char>.Empty, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextString(ArraySegment<char>.Empty, -1));
     }
 }

X10D.Tests/src/Core/SpanTest.cs

@@ -2,191 +2,203 @@
 using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
 #endif
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
-public class SpanTest
+[TestFixture]
+internal class SpanTest
 {
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingByteEnum()
     {
-        ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
-
-        Assert.IsFalse(span.Contains(EnumByte.A));
-        Assert.IsFalse(span.Contains(EnumByte.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
+            Assert.That(span.Contains(EnumByte.A), Is.False);
+            Assert.That(span.Contains(EnumByte.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt16Enum()
     {
-        ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
-
-        Assert.IsFalse(span.Contains(EnumInt16.A));
-        Assert.IsFalse(span.Contains(EnumInt16.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
+            Assert.That(span.Contains(EnumInt16.A), Is.False);
+            Assert.That(span.Contains(EnumInt16.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt32Enum()
     {
-        ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
-
-        Assert.IsFalse(span.Contains(EnumInt32.A));
-        Assert.IsFalse(span.Contains(EnumInt32.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
+            Assert.That(span.Contains(EnumInt32.A), Is.False);
+            Assert.That(span.Contains(EnumInt32.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt64Enum()
     {
-        ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsFalse(span.Contains(EnumInt64.A));
-        Assert.IsFalse(span.Contains(EnumInt64.C));
+            Assert.That(span.Contains(EnumInt64.A), Is.False);
+            Assert.That(span.Contains(EnumInt64.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingByteEnum()
     {
         ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsTrue(span.Contains(EnumByte.B));
+        Assert.That(span.Contains(EnumByte.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt16Enum()
     {
         ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsTrue(span.Contains(EnumInt16.B));
+        Assert.That(span.Contains(EnumInt16.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt32Enum()
     {
         ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsTrue(span.Contains(EnumInt32.B));
+        Assert.That(span.Contains(EnumInt32.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt64Enum()
     {
         ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsTrue(span.Contains(EnumInt64.B));
+        Assert.That(span.Contains(EnumInt64.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingByteEnum()
     {
-        Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
+        Assert.Multiple(() =>
+        {
+            Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsFalse(span.Contains(EnumByte.A));
-        Assert.IsFalse(span.Contains(EnumByte.C));
+            Assert.That(span.Contains(EnumByte.A), Is.False);
+            Assert.That(span.Contains(EnumByte.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt16Enum()
     {
         Span<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsFalse(span.Contains(EnumInt16.A));
-        Assert.IsFalse(span.Contains(EnumInt16.C));
+        Assert.That(span.Contains(EnumInt16.A), Is.False);
+        Assert.That(span.Contains(EnumInt16.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt32Enum()
     {
         Span<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsFalse(span.Contains(EnumInt32.A));
-        Assert.IsFalse(span.Contains(EnumInt32.C));
+        Assert.That(span.Contains(EnumInt32.A), Is.False);
+        Assert.That(span.Contains(EnumInt32.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt64Enum()
     {
         Span<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsFalse(span.Contains(EnumInt64.A));
-        Assert.IsFalse(span.Contains(EnumInt64.C));
+        Assert.That(span.Contains(EnumInt64.A), Is.False);
+        Assert.That(span.Contains(EnumInt64.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingByteEnum()
     {
         Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsTrue(span.Contains(EnumByte.B));
+        Assert.That(span.Contains(EnumByte.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt16Enum()
     {
         Span<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsTrue(span.Contains(EnumInt16.B));
+        Assert.That(span.Contains(EnumInt16.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt32Enum()
     {
         Span<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsTrue(span.Contains(EnumInt32.B));
+        Assert.That(span.Contains(EnumInt32.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt64Enum()
     {
         Span<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsTrue(span.Contains(EnumInt64.B));
+        Assert.That(span.Contains(EnumInt64.B));
     }
 
-    [TestMethod]
+    [Test]
     public void PackByte_ShouldThrowArgumentException_GivenSpanLengthGreaterThan8()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[9];
-            return span.PackByte();
+            _ = span.PackByte();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt16_ShouldThrowArgumentException_GivenSpanLengthGreaterThan16()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[17];
-            return span.PackInt16();
+            _ = span.PackInt16();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldThrowArgumentException_GivenSpanLengthGreaterThan32()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[33];
-            return span.PackInt32();
+            _ = span.PackInt32();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldThrowArgumentException_GivenSpanLengthGreaterThan64()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[65];
-            return span.PackInt64();
+            _ = span.PackInt64();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackByteInternal_Fallback_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         const byte expected = 0b00110011;
@@ -194,11 +206,11 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackByteInternal_Sse2_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         if (!Sse2.IsSupported)
@@ -211,10 +223,10 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackByteInternal_AdvSimd_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         if (!AdvSimd.IsSupported)
@@ -227,11 +239,11 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_AdvSimd();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt16_ShouldReturnSameAsPackByte_WhenSpanHasLength8()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -239,10 +251,10 @@ public class SpanTest
         short expected = span.PackByte();
         short actual = span.PackInt16();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt16Internal_Fallback_ShouldReturnCorrectInt16_GivenReadOnlySpan()
     {
         const short expected = 0b00101101_11010100;
@@ -253,11 +265,11 @@ public class SpanTest
 
         short actual = span.PackInt16Internal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackInt16Internal_Sse2_ShouldReturnCorrectInt16_GivenReadOnlySpan_Using()
     {
         if (!Sse2.IsSupported)
@@ -273,11 +285,11 @@ public class SpanTest
 
         short actual = span.PackInt16Internal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Fallback_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         const int expected = 0b01010101_10101010_01010101_10101010;
@@ -289,11 +301,11 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Sse2_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!Sse2.IsSupported)
@@ -310,10 +322,10 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Avx2_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!Avx2.IsSupported)
@@ -330,10 +342,10 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Avx2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_AdvSimd_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!AdvSimd.IsSupported)
@@ -350,11 +362,11 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_AdvSimd();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -362,10 +374,10 @@ public class SpanTest
         int expected = span.PackByte();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingSpan()
     {
         Span<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -373,10 +385,10 @@ public class SpanTest
         int expected = span.PackByte();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[16]
@@ -387,10 +399,10 @@ public class SpanTest
         int expected = span.PackInt16();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[16]
@@ -401,10 +413,10 @@ public class SpanTest
         int expected = span.PackInt16();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnCorrectInt64_GivenReadOnlySpan()
     {
         const long expected = 0b01010101_11010110_01101001_11010110_00010010_10010111_00101100_10100101;
@@ -418,10 +430,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnCorrectInt64_GivenSpan()
     {
         const long expected = 0b01010101_11010110_01101001_11010110_00010010_10010111_00101100_10100101;
@@ -435,10 +447,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -446,10 +458,10 @@ public class SpanTest
         long expected = span.PackByte();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingSpan()
     {
         Span<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -457,10 +469,10 @@ public class SpanTest
         long expected = span.PackByte();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[16]
@@ -471,10 +483,10 @@ public class SpanTest
         long expected = span.PackInt16();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[16]
@@ -485,10 +497,10 @@ public class SpanTest
         long expected = span.PackInt16();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt32_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[32]
@@ -500,10 +512,10 @@ public class SpanTest
         long expected = span.PackInt32();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt32_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[32]
@@ -515,10 +527,10 @@ public class SpanTest
         long expected = span.PackInt32();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldFallbackAndReturnCorrectValue_GivenNonPowerOfTwoLength_UsingReadOnlySpan()
     {
         const long expected = 0b00000000_00000000_00000000_00000000_00000000_00000000_00000001_01010011;
@@ -526,10 +538,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldFallbackAndReturnCorrectValue_GivenNonPowerOfTwoLength_UsingSpan()
     {
         const long expected = 0b00000000_00000000_00000000_00000000_00000000_00000000_00000001_01010011;
@@ -537,7 +549,7 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
     private enum EnumByte : byte

X10D.Tests/src/Drawing/CircleFTests.cs

@@ -1,167 +1,193 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class CircleFTests
+[TestFixture]
+internal class CircleFTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(MathF.PI, unitCircle.Area);
+        Assert.That(unitCircle.Area, Is.EqualTo(MathF.PI));
     }
 
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitCircle.Circumference, 1e-6f);
+        Assert.That(unitCircle.Circumference, Is.EqualTo(2 * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, CircleF.Empty.CompareTo(CircleF.Unit));
+        Assert.That(CircleF.Empty.CompareTo(CircleF.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, CircleF.Unit.CompareTo(CircleF.Empty));
+        Assert.That(CircleF.Unit.CompareTo(CircleF.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, CircleF.Empty.CompareTo((object)CircleF.Unit));
+        Assert.That(CircleF.Empty.CompareTo((object)CircleF.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, CircleF.Unit.CompareTo(null));
+        Assert.That(CircleF.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => CircleF.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = CircleF.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitCircle()
     {
-        Assert.AreEqual(2.0f, CircleF.Unit.Diameter, 1e-6f);
+        Assert.That(CircleF.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = CircleF.Unit;
         var unitCircle2 = CircleF.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+            Assert.That(unitCircle1 == unitCircle2);
+            Assert.That(unitCircle2 == unitCircle1);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenUnitCirclesAsObjects()
     {
         CircleF unitCircle1 = CircleF.Unit;
         object unitCircle2 = CircleF.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1.Equals(unitCircle2));
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(CircleF.Unit, CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit == CircleF.Empty);
-        Assert.IsTrue(CircleF.Unit != CircleF.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(CircleF.Empty, Is.Not.EqualTo(CircleF.Unit));
+            Assert.That(CircleF.Unit, Is.Not.EqualTo(CircleF.Empty));
+
+            Assert.That(CircleF.Empty != CircleF.Unit);
+            Assert.That(CircleF.Unit != CircleF.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.AreNotEqual((object?)null, CircleF.Empty);
-        Assert.IsFalse(CircleF.Empty.Equals(null));
+        Assert.That(CircleF.Empty, Is.Not.EqualTo(null));
+        Assert.That(CircleF.Empty.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = CircleF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, CircleF.Empty.GetHashCode());
+        Assert.That(CircleF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = CircleF.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, CircleF.Unit.GetHashCode());
+        Assert.That(CircleF.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         CircleF unitCircle = CircleF.Unit;
         Circle converted = (Circle)unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.Radius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Circle)unitCircle));
+            Assert.That(converted == (Circle)unitCircle);
+            Assert.That(converted.Radius, Is.EqualTo(unitCircle.Radius));
+            Assert.That((PointF)converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(CircleF.Unit > CircleF.Empty);
-        Assert.IsTrue(CircleF.Unit >= CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit < CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit <= CircleF.Empty);
+        Assert.That(CircleF.Unit, Is.GreaterThan(CircleF.Empty));
+        Assert.That(CircleF.Unit, Is.GreaterThanOrEqualTo(CircleF.Empty));
+
+        Assert.That(CircleF.Unit > CircleF.Empty);
+        Assert.That(CircleF.Unit >= CircleF.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         CircleF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.Radius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((CircleF)unitCircle));
+            Assert.That(converted == unitCircle);
+            Assert.That(converted.Radius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(CircleF.Empty < CircleF.Unit);
-        Assert.IsTrue(CircleF.Empty <= CircleF.Unit);
-        Assert.IsFalse(CircleF.Empty > CircleF.Unit);
-        Assert.IsFalse(CircleF.Empty >= CircleF.Unit);
+        Assert.Multiple(() =>
+        {
+            Assert.That(CircleF.Empty, Is.LessThan(CircleF.Unit));
+            Assert.That(CircleF.Empty, Is.LessThanOrEqualTo(CircleF.Unit));
+
+            Assert.That(CircleF.Empty < CircleF.Unit);
+            Assert.That(CircleF.Empty <= CircleF.Unit);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptyCircle()
     {
-        Assert.AreEqual(0.0f, CircleF.Empty.Radius, 1e-6f);
+        Assert.That(CircleF.Empty.Radius, Is.EqualTo(0.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitCircle()
     {
-        Assert.AreEqual(1.0f, CircleF.Unit.Radius, 1e-6f);
+        Assert.That(CircleF.Unit.Radius, Is.EqualTo(1.0f).Within(1e-6f));
     }
 }

X10D.Tests/src/Drawing/CircleTests.cs

@@ -1,145 +1,161 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class CircleTests
+[TestFixture]
+internal class CircleTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(MathF.PI * unitCircle.Radius * unitCircle.Radius, unitCircle.Area);
+        Assert.That(unitCircle.Area, Is.EqualTo(MathF.PI * unitCircle.Radius * unitCircle.Radius));
     }
 
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(2.0f * MathF.PI * unitCircle.Radius, unitCircle.Circumference, 1e-6f);
+        Assert.That(unitCircle.Circumference, Is.EqualTo(2.0f * MathF.PI * unitCircle.Radius).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, Circle.Empty.CompareTo(Circle.Unit));
+        Assert.That(Circle.Empty.CompareTo(Circle.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, Circle.Unit.CompareTo(Circle.Empty));
+        Assert.That(Circle.Unit.CompareTo(Circle.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, Circle.Empty.CompareTo((object)Circle.Unit));
+        Assert.That(Circle.Empty.CompareTo((object)Circle.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Circle.Unit.CompareTo(null));
+        Assert.That(Circle.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Circle.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Circle.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitCircle()
     {
-        Assert.AreEqual(2.0f, Circle.Unit.Diameter, 1e-6f);
+        Assert.That(Circle.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = Circle.Unit;
         var unitCircle2 = Circle.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenUnitCirclesAsObjects()
     {
         Circle unitCircle1 = Circle.Unit;
         object unitCircle2 = Circle.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1.Equals(unitCircle2));
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(Circle.Unit, Circle.Empty);
-        Assert.IsFalse(Circle.Unit == Circle.Empty);
-        Assert.IsTrue(Circle.Unit != Circle.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Circle.Empty, Is.Not.EqualTo(Circle.Unit));
+            Assert.That(Circle.Unit, Is.Not.EqualTo(Circle.Empty));
+
+            Assert.That(Circle.Empty != Circle.Unit);
+            Assert.That(Circle.Unit != Circle.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.AreNotEqual((object?)null, Circle.Empty);
-        Assert.IsFalse(Circle.Empty.Equals(null));
+        Assert.That(Circle.Empty, Is.Not.EqualTo(null));
+        Assert.That(Circle.Empty.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Circle.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Circle.Empty.GetHashCode());
+        Assert.That(Circle.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Circle.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Circle.Unit.GetHashCode());
+        Assert.That(Circle.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Circle.Unit > Circle.Empty);
-        Assert.IsTrue(Circle.Unit >= Circle.Empty);
-        Assert.IsFalse(Circle.Unit < Circle.Empty);
-        Assert.IsFalse(Circle.Unit <= Circle.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Circle.Unit, Is.GreaterThan(Circle.Empty));
+            Assert.That(Circle.Unit, Is.GreaterThanOrEqualTo(Circle.Empty));
+            Assert.That(Circle.Unit > Circle.Empty);
+            Assert.That(Circle.Unit >= Circle.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Circle.Empty < Circle.Unit);
-        Assert.IsTrue(Circle.Empty <= Circle.Unit);
-        Assert.IsFalse(Circle.Empty > Circle.Unit);
-        Assert.IsFalse(Circle.Empty >= Circle.Unit);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Circle.Empty, Is.LessThan(Circle.Unit));
+            Assert.That(Circle.Empty, Is.LessThanOrEqualTo(Circle.Unit));
+            Assert.That(Circle.Empty < Circle.Unit);
+            Assert.That(Circle.Empty <= Circle.Unit);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptyCircle()
     {
-        Assert.AreEqual(0, Circle.Empty.Radius);
+        Assert.That(Circle.Empty.Radius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitCircle()
     {
-        Assert.AreEqual(1, Circle.Unit.Radius);
+        Assert.That(Circle.Unit.Radius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/ColorTests.cs

@@ -1,11 +1,11 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class ColorTests
+[TestFixture]
+internal class ColorTests
 {
     private static readonly Color Black = Color.FromArgb(0, 0, 0);
     private static readonly Color White = Color.FromArgb(255, 255, 255);
@@ -16,251 +16,278 @@ public class ColorTests
     private static readonly Color Magenta = Color.FromArgb(255, 0, 255);
     private static readonly Color Yellow = Color.FromArgb(255, 255, 0);
 
-    [TestMethod]
+    [Test]
     public void Deconstruct_ShouldDeconstructColor_GivenColor()
     {
         (byte r, byte g, byte b) = Black;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (byte a, r, g, b) = Black;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Red;
-        Assert.AreEqual(255, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.EqualTo(255));
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (a, r, g, b) = Red;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(255, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.EqualTo(255));
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Green;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(255, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.EqualTo(255));
+            Assert.That(b, Is.Zero);
+        });
 
         (a, r, g, b) = Green;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(255, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.EqualTo(255));
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Blue;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(255, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.EqualTo(255));
+        });
 
         (a, r, g, b) = Blue;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(255, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.EqualTo(255));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void GetClosestConsoleColor_ShouldReturnClosestColor_GivenValidColor()
     {
-        Assert.AreEqual(ConsoleColor.White, Color.Transparent.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.AliceBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.AntiqueWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Aqua.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Aquamarine.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Azure.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Beige.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Bisque.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Black, Color.Black.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.BlanchedAlmond.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Blue, Color.Blue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.BlueViolet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Brown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.BurlyWood.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.CadetBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Chartreuse.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Chocolate.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Coral.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.CornflowerBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Cornsilk.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Red, Color.Crimson.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Cyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.DarkBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.DarkCyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.DarkGoldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGreen, Color.DarkGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkKhaki.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkMagenta.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DarkOliveGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.DarkOrange.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkOrchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.DarkRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkSalmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DarkSlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGreen, Color.DarkSlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DarkTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkViolet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.DeepPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DeepSkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DimGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DodgerBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Firebrick.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.FloralWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.ForestGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.Fuchsia.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Gainsboro.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.GhostWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Gold.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Goldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.Gray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.Green.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.GreenYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Honeydew.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.HotPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.IndianRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.Indigo.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Ivory.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Khaki.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Lavender.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LavenderBlush.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.LawnGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LemonChiffon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightCoral.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightCyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightGoldenrodYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSalmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.LightSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.LightSlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSteelBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.Lime.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.LimeGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Linen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.Magenta.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Maroon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumAquamarine.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Blue, Color.MediumBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumOrchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumPurple.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.MediumSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumSlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.MediumSpringGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.MediumTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.MediumVioletRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.MidnightBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.MintCream.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.MistyRose.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Moccasin.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.NavajoWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.Navy.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.OldLace.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.Olive.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.OliveDrab.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Orange.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Red, Color.OrangeRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Orchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PaleGoldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PaleGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PaleTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PaleVioletRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PapayaWhip.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PeachPuff.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Peru.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Pink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Plum.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PowderBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.Purple.GetClosestConsoleColor());
+        Assert.Multiple(() =>
+        {
+            Assert.That(Color.Transparent.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.AliceBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.AntiqueWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Aqua.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Aquamarine.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Azure.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Beige.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Bisque.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Black.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Black));
+            Assert.That(Color.BlanchedAlmond.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Blue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Blue));
+            Assert.That(Color.BlueViolet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.Brown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.BurlyWood.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.CadetBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Chartreuse.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Chocolate.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Coral.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.CornflowerBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Cornsilk.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Crimson.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.Cyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DarkBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.DarkCyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.DarkGoldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.DarkGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGreen));
+            Assert.That(Color.DarkKhaki.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkMagenta.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DarkOliveGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DarkOrange.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.DarkOrchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DarkRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.DarkSalmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkSlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DarkSlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGreen));
+            Assert.That(Color.DarkTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DarkViolet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DeepPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.DeepSkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DimGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DodgerBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Firebrick.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.FloralWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.ForestGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.Fuchsia.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.Gainsboro.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.GhostWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Gold.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Goldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Gray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Green.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.GreenYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Honeydew.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.HotPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.IndianRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Indigo.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.Ivory.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Khaki.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Lavender.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LavenderBlush.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LawnGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.LemonChiffon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightCoral.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightCyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightGoldenrodYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSalmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.LightSkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.LightSteelBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Lime.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.LimeGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.Linen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Magenta.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.Maroon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.MediumAquamarine.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Blue));
+            Assert.That(Color.MediumOrchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumPurple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.MediumSlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumSpringGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.MediumTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.MediumVioletRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.MidnightBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.MintCream.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.MistyRose.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Moccasin.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.NavajoWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Navy.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.OldLace.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Olive.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.OliveDrab.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Orange.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.OrangeRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.Orchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PaleGoldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PaleGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PaleTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PaleVioletRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PapayaWhip.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PeachPuff.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Peru.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Pink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Plum.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PowderBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Purple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
 #if NET6_0_OR_GREATER
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.RebeccaPurple.GetClosestConsoleColor());
+            Assert.That(Color.RebeccaPurple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
 #endif
-        Assert.AreEqual(ConsoleColor.Red, Color.Red.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.RosyBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.RoyalBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.SaddleBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Salmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.SandyBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.SeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.SeaShell.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Sienna.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Silver.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.SkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Snow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.SpringGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SteelBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Tan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.Teal.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Thistle.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Tomato.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Turquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Violet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Wheat.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.White.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.WhiteSmoke.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Yellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.YellowGreen.GetClosestConsoleColor());
+            Assert.That(Color.Red.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.RosyBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.RoyalBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SaddleBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.Salmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SandyBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.SeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SeaShell.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Sienna.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.Silver.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.SlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Snow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.SpringGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SteelBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Tan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Teal.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.Thistle.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Tomato.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Turquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Violet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Wheat.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.White.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.WhiteSmoke.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Yellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.YellowGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Inverted_ShouldReturnInvertedColor()
     {
-        Assert.AreEqual(White, Black.Inverted());
-        Assert.AreEqual(Black, White.Inverted());
-        Assert.AreEqual(Red, Cyan.Inverted());
-        Assert.AreEqual(Cyan, Red.Inverted());
-        Assert.AreEqual(Green, Magenta.Inverted());
-        Assert.AreEqual(Magenta, Green.Inverted());
-        Assert.AreEqual(Yellow, Blue.Inverted());
-        Assert.AreEqual(Blue, Yellow.Inverted());
+        Assert.That(Black.Inverted(), Is.EqualTo(White));
+        Assert.That(White.Inverted(), Is.EqualTo(Black));
+        Assert.That(Cyan.Inverted(), Is.EqualTo(Red));
+        Assert.That(Red.Inverted(), Is.EqualTo(Cyan));
+        Assert.That(Magenta.Inverted(), Is.EqualTo(Green));
+        Assert.That(Green.Inverted(), Is.EqualTo(Magenta));
+        Assert.That(Blue.Inverted(), Is.EqualTo(Yellow));
+        Assert.That(Yellow.Inverted(), Is.EqualTo(Blue));
     }
 
-    [TestMethod]
+    [Test]
     public void Inverted_ShouldIgnoreAlpha()
     {
         Color expected = Color.FromArgb(255, 0, 0, 0);
         Color actual = Color.FromArgb(255, 255, 255, 255).Inverted();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void WithA0_ShouldReturnSameColor_GivenWhite()
     {
         Color transparent = Color.FromArgb(0, 255, 255, 255);
-        Assert.AreEqual(transparent, White.WithA(0));
-        Assert.AreEqual(transparent, transparent.WithA(0));
+        Assert.That(White.WithA(0), Is.EqualTo(transparent));
+        Assert.That(transparent.WithA(0), Is.EqualTo(transparent));
     }
 
-    [TestMethod]
+    [Test]
     public void WithB0_ShouldReturnYellow_GivenWhite()
     {
-        Assert.AreEqual(Yellow, White.WithB(0));
-        Assert.AreEqual(Yellow, Yellow.WithB(0));
+        Assert.That(White.WithB(0), Is.EqualTo(Yellow));
+        Assert.That(Yellow.WithB(0), Is.EqualTo(Yellow));
     }
 
-    [TestMethod]
+    [Test]
     public void WithG0_ShouldReturnMagenta_GivenWhite()
     {
-        Assert.AreEqual(Magenta, White.WithG(0));
-        Assert.AreEqual(Magenta, Magenta.WithG(0));
+        Assert.That(White.WithG(0), Is.EqualTo(Magenta));
+        Assert.That(Magenta.WithG(0), Is.EqualTo(Magenta));
     }
 
-    [TestMethod]
+    [Test]
     public void WithR0_ShouldReturnCyan_GivenWhite()
     {
-        Assert.AreEqual(Cyan, White.WithR(0));
-        Assert.AreEqual(Cyan, Cyan.WithR(0));
+        Assert.That(White.WithR(0), Is.EqualTo(Cyan));
+        Assert.That(Cyan.WithR(0), Is.EqualTo(Cyan));
     }
 }

X10D.Tests/src/Drawing/CuboidTests.cs

@@ -1,82 +1,82 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class CuboidTests
+[TestFixture]
+internal class CuboidTests
 {
-    [TestMethod]
+    [Test]
     public void Corners_ShouldBeCorrect_GivenCubeOfSize1()
     {
         Cuboid cube = Cuboid.Cube;
 
-        Assert.AreEqual(new Vector3(0.5f, 0.5f, -0.5f), cube.FrontTopRight);
-        Assert.AreEqual(new Vector3(-0.5f, 0.5f, -0.5f), cube.FrontTopLeft);
-        Assert.AreEqual(new Vector3(0.5f, -0.5f, -0.5f), cube.FrontBottomRight);
-        Assert.AreEqual(new Vector3(-0.5f, -0.5f, -0.5f), cube.FrontBottomLeft);
-        Assert.AreEqual(new Vector3(0.5f, 0.5f, 0.5f), cube.BackTopRight);
-        Assert.AreEqual(new Vector3(-0.5f, 0.5f, 0.5f), cube.BackTopLeft);
-        Assert.AreEqual(new Vector3(0.5f, -0.5f, 0.5f), cube.BackBottomRight);
-        Assert.AreEqual(new Vector3(-0.5f, -0.5f, 0.5f), cube.BackBottomLeft);
+        Assert.That(cube.FrontTopRight, Is.EqualTo(new Vector3(0.5f, 0.5f, -0.5f)));
+        Assert.That(cube.FrontTopLeft, Is.EqualTo(new Vector3(-0.5f, 0.5f, -0.5f)));
+        Assert.That(cube.FrontBottomRight, Is.EqualTo(new Vector3(0.5f, -0.5f, -0.5f)));
+        Assert.That(cube.FrontBottomLeft, Is.EqualTo(new Vector3(-0.5f, -0.5f, -0.5f)));
+        Assert.That(cube.BackTopRight, Is.EqualTo(new Vector3(0.5f, 0.5f, 0.5f)));
+        Assert.That(cube.BackTopLeft, Is.EqualTo(new Vector3(-0.5f, 0.5f, 0.5f)));
+        Assert.That(cube.BackBottomRight, Is.EqualTo(new Vector3(0.5f, -0.5f, 0.5f)));
+        Assert.That(cube.BackBottomLeft, Is.EqualTo(new Vector3(-0.5f, -0.5f, 0.5f)));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoCubesOfSize1()
     {
         var cube1 = Cuboid.Cube;
         var cube2 = Cuboid.Cube;
-        Assert.AreEqual(cube1, cube2);
-        Assert.IsTrue(cube1 == cube2);
-        Assert.IsFalse(cube1 != cube2);
+        Assert.That(cube1, Is.EqualTo(cube2));
+        Assert.That(cube2, Is.EqualTo(cube1));
+        Assert.That(cube1 == cube2);
+        Assert.That(cube2 == cube1);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCubes()
     {
-        Assert.AreNotEqual(Cuboid.Cube, Cuboid.Empty);
-        Assert.IsFalse(Cuboid.Cube == Cuboid.Empty);
-        Assert.IsTrue(Cuboid.Cube != Cuboid.Empty);
+        Assert.That(Cuboid.Empty, Is.Not.EqualTo(Cuboid.Cube));
+        Assert.That(Cuboid.Empty != Cuboid.Cube);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Cuboid.Cube.Equals(null));
+        Assert.That(Cuboid.Cube.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Cuboid.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Cuboid.Empty.GetHashCode());
+        Assert.That(Cuboid.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenCubeOfSize1()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Cuboid.Cube.GetHashCode();
-        Assert.AreEqual(hashCode, Cuboid.Cube.GetHashCode());
+        Assert.That(Cuboid.Cube.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void Size_ShouldBeOne_GivenCubeOfSize1()
     {
-        Assert.AreEqual(Vector3.One, Cuboid.Cube.Size);
+        Assert.That(Cuboid.Cube.Size, Is.EqualTo(Vector3.One));
     }
 
-    [TestMethod]
+    [Test]
     public void Size_ShouldBeOne_GivenRotatedCube()
     {
-        Assert.AreEqual(Vector3.One, new Cuboid(0, 0, 0, 1, 1, 1, 90, 0, 0).Size);
+        Assert.That(new Cuboid(0, 0, 0, 1, 1, 1, 90, 0, 0).Size, Is.EqualTo(Vector3.One));
     }
 
-    [TestMethod]
+    [Test]
     public void Volume_ShouldBe1_GivenCubeOfSize1()
     {
-        Assert.AreEqual(1.0f, Cuboid.Cube.Volume, 1e-6f);
+        Assert.That(Cuboid.Cube.Volume, Is.EqualTo(1.0f).Within(1e-6f));
     }
 }

X10D.Tests/src/Drawing/EllipseFTests.cs

@@ -1,156 +1,171 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class EllipseFTests
+[TestFixture]
+internal class EllipseFTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitEllipse()
     {
         var unitEllipse = EllipseF.Unit;
-        Assert.AreEqual(MathF.PI, unitEllipse.Area, 1e-6f);
+        Assert.That(unitEllipse.Area, Is.EqualTo(MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void ApproximateCircumference_ShouldBe2PiRadius_GivenUnitEllipse()
     {
         var unitEllipse = EllipseF.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
+        Assert.That(unitEllipse.ApproximateCircumference, Is.EqualTo(2 * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldGiveCorrectEllipse()
     {
         var ellipse = new EllipseF(PointF.Empty, new SizeF(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(0, 0, 2, 1);
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(PointF.Empty, new Vector2(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(Vector2.Zero, new Vector2(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
         var unitEllipse1 = EllipseF.Unit;
         var unitEllipse2 = EllipseF.Unit;
-        Assert.AreEqual(unitEllipse1, unitEllipse2);
-        Assert.IsTrue(unitEllipse1 == unitEllipse2);
-        Assert.IsFalse(unitEllipse1 != unitEllipse2);
+        Assert.That(unitEllipse2, Is.EqualTo(unitEllipse1));
+        Assert.That(unitEllipse1, Is.EqualTo(unitEllipse2));
+        Assert.That(unitEllipse2 == unitEllipse1);
+        Assert.That(unitEllipse1 == unitEllipse2);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentEllipses()
     {
-        Assert.AreNotEqual(EllipseF.Unit, EllipseF.Empty);
-        Assert.IsFalse(EllipseF.Unit == EllipseF.Empty);
-        Assert.IsTrue(EllipseF.Unit != EllipseF.Empty);
+        Assert.That(EllipseF.Empty, Is.Not.EqualTo(EllipseF.Unit));
+        Assert.That(EllipseF.Empty != EllipseF.Unit);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(EllipseF.Unit.Equals(null));
+        Assert.That(EllipseF.Unit, Is.Not.EqualTo(null));
+        Assert.That(EllipseF.Unit.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = EllipseF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, EllipseF.Empty.GetHashCode());
+        Assert.That(EllipseF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = EllipseF.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, EllipseF.Unit.GetHashCode());
+        Assert.That(EllipseF.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, EllipseF.Empty.HorizontalRadius);
+        Assert.That(EllipseF.Empty.HorizontalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, EllipseF.Unit.HorizontalRadius);
+        Assert.That(EllipseF.Unit.HorizontalRadius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentEllipse_GivenEllipse()
     {
         EllipseF unitEllipse = EllipseF.Unit;
         Ellipse converted = (Ellipse)unitEllipse;
 
-        Assert.AreEqual(unitEllipse, converted);
-        Assert.AreEqual(unitEllipse.HorizontalRadius, converted.HorizontalRadius);
-        Assert.AreEqual(unitEllipse.VerticalRadius, converted.VerticalRadius);
-        Assert.AreEqual(unitEllipse.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Ellipse)unitEllipse));
+            Assert.That(converted == unitEllipse);
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitEllipse.HorizontalRadius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitEllipse.VerticalRadius));
+            Assert.That((PointF)converted.Center, Is.EqualTo(unitEllipse.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         EllipseF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitCircle));
+            Assert.That(converted == unitCircle);
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircleF()
     {
         CircleF unitCircle = CircleF.Unit;
         EllipseF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitCircle));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenEllipse()
     {
         Ellipse unitEllipse = Ellipse.Unit;
         EllipseF converted = unitEllipse;
 
-        Assert.AreEqual(unitEllipse, converted);
-        Assert.AreEqual(unitEllipse.HorizontalRadius, converted.HorizontalRadius);
-        Assert.AreEqual(unitEllipse.VerticalRadius, converted.VerticalRadius);
-        Assert.AreEqual(unitEllipse.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitEllipse));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitEllipse.HorizontalRadius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitEllipse.VerticalRadius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitEllipse.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, EllipseF.Empty.VerticalRadius);
+        Assert.That(EllipseF.Empty.VerticalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, EllipseF.Unit.VerticalRadius);
+        Assert.That(EllipseF.Unit.VerticalRadius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/EllipseTests.cs

@@ -1,111 +1,128 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class EllipseTests
+[TestFixture]
+internal class EllipseTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitEllipse()
     {
         var unitEllipse = Ellipse.Unit;
-        Assert.AreEqual(MathF.PI, unitEllipse.Area, 1e-6f);
+        Assert.That(unitEllipse.Area, Is.EqualTo(MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void ApproximateCircumference_ShouldBe2PiRadius_GivenUnitEllipse()
     {
         var unitEllipse = Ellipse.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
+        Assert.That(unitEllipse.ApproximateCircumference, Is.EqualTo(2.0f * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldGiveCorrectEllipse()
     {
         var ellipse = new Ellipse(Point.Empty, new Size(2, 1));
-        Assert.AreEqual(new Point(0, 0), ellipse.Center);
-        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+        Assert.Multiple(() =>
+        {
+            Assert.That(ellipse.Center, Is.EqualTo(new Point(0, 0)));
+            Assert.That(ellipse.Radius, Is.EqualTo(new Size(2, 1)));
+        });
 
         ellipse = new Ellipse(0, 0, 2, 1);
-        Assert.AreEqual(new Point(0, 0), ellipse.Center);
-        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+        Assert.Multiple(() =>
+        {
+            Assert.That(ellipse.Center, Is.EqualTo(new Point(0, 0)));
+            Assert.That(ellipse.Radius, Is.EqualTo(new Size(2, 1)));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
         var unitEllipse1 = Ellipse.Unit;
         var unitEllipse2 = Ellipse.Unit;
-        Assert.AreEqual(unitEllipse1, unitEllipse2);
-        Assert.IsTrue(unitEllipse1 == unitEllipse2);
-        Assert.IsFalse(unitEllipse1 != unitEllipse2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitEllipse2, Is.EqualTo(unitEllipse1));
+            Assert.That(unitEllipse1, Is.EqualTo(unitEllipse2));
+            Assert.That(unitEllipse2 == unitEllipse1);
+            Assert.That(unitEllipse1 == unitEllipse2);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentEllipses()
     {
-        Assert.AreNotEqual(Ellipse.Unit, Ellipse.Empty);
-        Assert.IsFalse(Ellipse.Unit == Ellipse.Empty);
-        Assert.IsTrue(Ellipse.Unit != Ellipse.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Ellipse.Empty, Is.Not.EqualTo(Ellipse.Unit));
+            Assert.That(Ellipse.Unit, Is.Not.EqualTo(Ellipse.Empty));
+            Assert.That(Ellipse.Empty != Ellipse.Unit);
+            Assert.That(Ellipse.Unit != Ellipse.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Ellipse.Unit.Equals(null));
+        Assert.That(Ellipse.Unit.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Ellipse.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Ellipse.Empty.GetHashCode());
+        Assert.That(Ellipse.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Ellipse.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Ellipse.Unit.GetHashCode());
+        Assert.That(Ellipse.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, Ellipse.Empty.HorizontalRadius);
+        Assert.That(Ellipse.Empty.HorizontalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, Ellipse.Unit.HorizontalRadius);
+        Assert.That(Ellipse.Unit.HorizontalRadius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         Ellipse converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Ellipse)unitCircle));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, Ellipse.Empty.VerticalRadius);
+        Assert.That(Ellipse.Empty.VerticalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, Ellipse.Unit.VerticalRadius);
+        Assert.That(Ellipse.Unit.VerticalRadius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/Line3DTests.cs

@@ -1,116 +1,115 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class Line3DTests
+[TestFixture]
+internal class Line3DTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, Line3D.Empty.CompareTo(Line3D.One));
+        Assert.That(Line3D.Empty.CompareTo(Line3D.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, Line3D.Empty.CompareTo((object)Line3D.One));
+        Assert.That(Line3D.Empty.CompareTo((object)Line3D.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Line3D.One.CompareTo(null));
+        Assert.That(Line3D.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, Line3D.One.CompareTo(Line3D.Empty));
+        Assert.That(Line3D.One.CompareTo(Line3D.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
         var unitLine3D = Line3D.One;
-        Assert.AreEqual(0, unitLine3D.CompareTo(unitLine3D));
+        Assert.That(unitLine3D.CompareTo(unitLine3D), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Line3D.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Line3D.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, Line3D.Empty.Length);
+        Assert.That(Line3D.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitX.Length, 1e-6f);
+        Assert.That(Line3D.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitY.Length, 1e-6f);
+        Assert.That(Line3D.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitZLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitZ.Length, 1e-6f);
+        Assert.That(Line3D.UnitZ.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         Line3D first = Line3D.One;
         Line3D second = Line3D.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.That(second, Is.EqualTo(first));
+        Assert.That(second == first);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(Line3D.One, Line3D.Empty);
-        Assert.IsFalse(Line3D.One == Line3D.Empty);
-        Assert.IsTrue(Line3D.One != Line3D.Empty);
+        Assert.That(Line3D.Empty, Is.Not.EqualTo(Line3D.One));
+        Assert.That(Line3D.Empty != Line3D.One);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Line3D.One.Equals(null));
+        Assert.That(Line3D.One, Is.Not.EqualTo(null));
+        Assert.That(Line3D.One.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line3D.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Line3D.Empty.GetHashCode());
+        Assert.That(Line3D.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line3D.One.GetHashCode();
-        Assert.AreEqual(hashCode, Line3D.One.GetHashCode());
+        Assert.That(Line3D.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line3D oneLine = new Line3D(Vector3.Zero, Vector3.UnitX + Vector3.UnitY);
@@ -119,12 +118,15 @@ public class Line3DTests
         var expectedStart = new Point((int)oneLine.Start.X, (int)oneLine.Start.Y);
         var expectedEnd = new Point((int)oneLine.End.X, (int)oneLine.End.Y);
 
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLineF_GivenLine()
     {
         Line3D oneLine = new Line3D(Vector3.Zero, Vector3.UnitX + Vector3.UnitY);
@@ -133,21 +135,25 @@ public class Line3DTests
         var expectedStart = new PointF(oneLine.Start.X, oneLine.Start.Y);
         var expectedEnd = new PointF(oneLine.End.X, oneLine.End.Y);
 
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Line3D.One > Line3D.Empty);
-        Assert.IsTrue(Line3D.One >= Line3D.Empty);
-        Assert.IsFalse(Line3D.One < Line3D.Empty);
-        Assert.IsFalse(Line3D.One <= Line3D.Empty);
+        Assert.That(Line3D.One, Is.GreaterThan(Line3D.Empty));
+        Assert.That(Line3D.One, Is.GreaterThanOrEqualTo(Line3D.Empty));
+
+        Assert.That(Line3D.One > Line3D.Empty);
+        Assert.That(Line3D.One >= Line3D.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line oneLine = Line.One;
@@ -156,13 +162,16 @@ public class Line3DTests
         var expectedStart = new Vector3(oneLine.Start.X, oneLine.Start.Y, 0.0f);
         var expectedEnd = new Vector3(oneLine.End.X, oneLine.End.Y, 0.0f);
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line3D)oneLine));
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLineF()
     {
         LineF oneLine = LineF.One;
@@ -171,18 +180,22 @@ public class Line3DTests
         var expectedStart = new Vector3(oneLine.Start.X, oneLine.Start.Y, 0.0f);
         var expectedEnd = new Vector3(oneLine.End.X, oneLine.End.Y, 0.0f);
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line3D)oneLine));
+            Assert.That(converted == oneLine);
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Line3D.Empty < Line3D.One);
-        Assert.IsTrue(Line3D.Empty <= Line3D.One);
-        Assert.IsFalse(Line3D.Empty > Line3D.One);
-        Assert.IsFalse(Line3D.Empty >= Line3D.One);
+        Assert.That(Line3D.Empty, Is.LessThan(Line3D.One));
+        Assert.That(Line3D.Empty, Is.LessThanOrEqualTo(Line3D.One));
+        Assert.That(Line3D.Empty < Line3D.One);
+        Assert.That(Line3D.Empty <= Line3D.One);
     }
 }

X10D.Tests/src/Drawing/LineFTests.cs

@@ -1,146 +1,163 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class LineFTests
+[TestFixture]
+internal class LineFTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, LineF.Empty.CompareTo(LineF.One));
+        Assert.That(LineF.Empty.CompareTo(LineF.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, LineF.Empty.CompareTo((object)LineF.One));
+        Assert.That(LineF.Empty.CompareTo((object)LineF.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, LineF.One.CompareTo(null));
+        Assert.That(LineF.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, LineF.One.CompareTo(LineF.Empty));
+        Assert.That(LineF.One.CompareTo(LineF.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
-        var unitLineF = LineF.One;
-        Assert.AreEqual(0, unitLineF.CompareTo(unitLineF));
+        Assert.That(LineF.One.CompareTo(LineF.One), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => LineF.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = LineF.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, LineF.Empty.Length);
+        Assert.That(LineF.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, LineF.UnitX.Length, 1e-6f);
+        Assert.That(LineF.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, LineF.UnitY.Length, 1e-6f);
+        Assert.That(LineF.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         LineF first = LineF.One;
         LineF second = LineF.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(LineF.One, LineF.Empty);
-        Assert.IsFalse(LineF.One == LineF.Empty);
-        Assert.IsTrue(LineF.One != LineF.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(LineF.Empty, Is.Not.EqualTo(LineF.One));
+            Assert.That(LineF.One, Is.Not.EqualTo(LineF.Empty));
+            Assert.That(LineF.Empty != LineF.One);
+            Assert.That(LineF.One != LineF.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(LineF.One.Equals(null));
+        Assert.That(LineF.One, Is.Not.EqualTo(null));
+        Assert.That(LineF.One.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = LineF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, LineF.Empty.GetHashCode());
+        Assert.That(LineF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = LineF.One.GetHashCode();
-        Assert.AreEqual(hashCode, LineF.One.GetHashCode());
+        Assert.That(LineF.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLine_GivenLine()
     {
         LineF oneLine = LineF.One;
         Line converted = (Line)oneLine;
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(oneLine.Start, converted.Start);
-        Assert.AreEqual(oneLine.End, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line)oneLine));
+            Assert.That(converted == oneLine);
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That((PointF)converted.Start, Is.EqualTo(oneLine.Start));
+            Assert.That((PointF)converted.End, Is.EqualTo(oneLine.End));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(LineF.One > LineF.Empty);
-        Assert.IsTrue(LineF.One >= LineF.Empty);
-        Assert.IsFalse(LineF.One < LineF.Empty);
-        Assert.IsFalse(LineF.One <= LineF.Empty);
+        Assert.That(LineF.One, Is.GreaterThan(LineF.Empty));
+        Assert.That(LineF.One, Is.GreaterThanOrEqualTo(LineF.Empty));
+        Assert.That(LineF.One > LineF.Empty);
+        Assert.That(LineF.One >= LineF.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line oneLine = Line.One;
         LineF converted = oneLine;
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(oneLine.Start, converted.Start);
-        Assert.AreEqual(oneLine.End, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((LineF)oneLine));
+            Assert.That(converted == oneLine);
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo((PointF)oneLine.Start));
+            Assert.That(converted.End, Is.EqualTo((PointF)oneLine.End));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(LineF.Empty < LineF.One);
-        Assert.IsTrue(LineF.Empty <= LineF.One);
-        Assert.IsFalse(LineF.Empty > LineF.One);
-        Assert.IsFalse(LineF.Empty >= LineF.One);
+        Assert.That(LineF.Empty, Is.LessThan(LineF.One));
+        Assert.That(LineF.Empty, Is.LessThanOrEqualTo(LineF.One));
+        Assert.That(LineF.Empty < LineF.One);
+        Assert.That(LineF.Empty <= LineF.One);
     }
 }

X10D.Tests/src/Drawing/LineTests.cs

@@ -1,122 +1,131 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class LineTests
+[TestFixture]
+internal class LineTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, Line.Empty.CompareTo(Line.One));
+        Assert.That(Line.Empty.CompareTo(Line.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, Line.Empty.CompareTo((object)Line.One));
+        Assert.That(Line.Empty.CompareTo((object)Line.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Line.One.CompareTo(null));
+        Assert.That(Line.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, Line.One.CompareTo(Line.Empty));
+        Assert.That(Line.One.CompareTo(Line.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
         var unitLine = Line.One;
-        Assert.AreEqual(0, unitLine.CompareTo(unitLine));
+        Assert.That(unitLine.CompareTo(unitLine), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Line.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Line.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         Line first = Line.One;
         Line second = Line.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(Line.One, Line.Empty);
-        Assert.IsFalse(Line.One == Line.Empty);
-        Assert.IsTrue(Line.One != Line.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Line.Empty, Is.Not.EqualTo(Line.One));
+            Assert.That(Line.One, Is.Not.EqualTo(Line.Empty));
+            Assert.That(Line.Empty != Line.One);
+            Assert.That(Line.One != Line.Empty);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Line.One.Equals(null));
+        Assert.That(Line.One, Is.Not.EqualTo(null));
+        Assert.That(Line.One.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Line.Empty.GetHashCode());
+        Assert.That(Line.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line.One.GetHashCode();
-        Assert.AreEqual(hashCode, Line.One.GetHashCode());
+        Assert.That(Line.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, Line.Empty.Length);
+        Assert.That(Line.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, Line.UnitX.Length, 1e-6f);
+        Assert.That(Line.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, Line.UnitY.Length, 1e-6f);
+        Assert.That(Line.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Line.One > Line.Empty);
-        Assert.IsTrue(Line.One >= Line.Empty);
-        Assert.IsFalse(Line.One < Line.Empty);
-        Assert.IsFalse(Line.One <= Line.Empty);
+        Assert.That(Line.One, Is.GreaterThan(Line.Empty));
+        Assert.That(Line.One, Is.GreaterThanOrEqualTo(Line.Empty));
+        Assert.That(Line.One > Line.Empty);
+        Assert.That(Line.One >= Line.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Line.Empty < Line.One);
-        Assert.IsTrue(Line.Empty <= Line.One);
-        Assert.IsFalse(Line.Empty > Line.One);
-        Assert.IsFalse(Line.Empty >= Line.One);
+        Assert.That(Line.Empty, Is.LessThan(Line.One));
+        Assert.That(Line.Empty, Is.LessThanOrEqualTo(Line.One));
+        Assert.That(Line.Empty < Line.One);
+        Assert.That(Line.Empty <= Line.One);
     }
 }

X10D.Tests/src/Drawing/PointFTests.cs

@@ -1,5 +1,5 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 #if !NET6_0_OR_GREATER
 using X10D.Core;
 #endif
@@ -7,59 +7,74 @@ using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class PointFTests
+[TestFixture]
+internal class PointFTests
 {
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnTrue_GivenPointOnLine()
     {
         var point = new PointF(1.0f, 0.0f);
         var line = new LineF(PointF.Empty, new PointF(2.0f, 0.0f));
 
-        Assert.IsTrue(point.IsOnLine(line));
-        Assert.IsTrue(point.IsOnLine(line.Start, line.End));
-        Assert.IsTrue(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line));
+            Assert.That(point.IsOnLine(line.Start, line.End));
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnFalse_GivenPointNotOnLine()
     {
         var point = new PointF(1.0f, 1.0f);
         var line = new LineF(PointF.Empty, new PointF(2.0f, 0.0f));
 
-        Assert.IsFalse(point.IsOnLine(line));
-        Assert.IsFalse(point.IsOnLine(line.Start, line.End));
-        Assert.IsFalse(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line), Is.False);
+            Assert.That(point.IsOnLine(line.Start, line.End), Is.False);
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestInteger_GivenNoParameters()
     {
         var point = new PointF(1.5f, 2.6f);
         var rounded = point.Round();
 
-        Assert.AreEqual(2, rounded.X);
-        Assert.AreEqual(3, rounded.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(rounded.X, Is.EqualTo(2));
+            Assert.That(rounded.Y, Is.EqualTo(3));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearest10_GivenPrecision10()
     {
         var point = new PointF(1.5f, 25.2f);
         var rounded = point.Round(10);
 
-        Assert.AreEqual(0, rounded.X);
-        Assert.AreEqual(30, rounded.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(rounded.X, Is.Zero);
+            Assert.That(rounded.Y, Is.EqualTo(30));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSizeF_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new PointF(random.NextSingle(), random.NextSingle());
         var size = point.ToSizeF();
 
-        Assert.AreEqual(point.X, size.Width, 1e-6f);
-        Assert.AreEqual(point.Y, size.Height, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Height, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/PointTests.cs

@@ -1,64 +1,79 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class PointTests
+[TestFixture]
+internal class PointTests
 {
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnTrue_GivenPointOnLine()
     {
         var point = new Point(1, 0);
         var line = new Line(Point.Empty, new Point(2, 0));
 
-        Assert.IsTrue(point.IsOnLine(line));
-        Assert.IsTrue(point.IsOnLine(line.Start, line.End));
-        Assert.IsTrue(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line));
+            Assert.That(point.IsOnLine(line.Start, line.End));
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnFalse_GivenPointNotOnLine()
     {
         var point = new Point(1, 1);
         var line = new Line(Point.Empty, new Point(2, 0));
 
-        Assert.IsFalse(point.IsOnLine(line));
-        Assert.IsFalse(point.IsOnLine(line.Start, line.End));
-        Assert.IsFalse(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line), Is.False);
+            Assert.That(point.IsOnLine(line.Start, line.End), Is.False);
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSize_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToSize();
 
-        Assert.AreEqual(point.X, size.Width);
-        Assert.AreEqual(point.Y, size.Height);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X));
+            Assert.That(size.Height, Is.EqualTo(point.Y));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSizeF_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToSizeF();
 
-        Assert.AreEqual(point.X, size.Width, 1e-6f);
-        Assert.AreEqual(point.Y, size.Height, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Height, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToVector2_ShouldReturnVector_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToVector2();
 
-        Assert.AreEqual(point.X, size.X, 1e-6f);
-        Assert.AreEqual(point.Y, size.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.X, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Y, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/PolygonFTests.cs

@@ -1,228 +1,230 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class PolygonFTests
+[TestFixture]
+internal class PolygonFTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polygon = PolygonF.Empty;
         polygon.AddVertices(new[] {new PointF(1, 2), new PointF(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfPointF()
     {
         var polygon = PolygonF.Empty;
         IEnumerable<PointF> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector2()
     {
         var polygon = PolygonF.Empty;
         IEnumerable<Vector2> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polygon = PolygonF.Empty;
         polygon.AddVertices(new[] {new Vector2(1, 2), new Vector2(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
 
         polygon.ClearVertices();
-        Assert.AreEqual(0, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolygon()
     {
         var pointPolygon = new PolygonF(new[] {new PointF(1, 2), new PointF(3, 4)});
         var vectorPolygon = new PolygonF(new[] {new Vector2(1, 2), new Vector2(3, 4)});
 
-        Assert.AreEqual(2, pointPolygon.VertexCount);
-        Assert.AreEqual(2, vectorPolygon.VertexCount);
+        Assert.That(pointPolygon.VertexCount, Is.EqualTo(2));
+        Assert.That(vectorPolygon.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfPointF()
     {
         IEnumerable<PointF> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector2()
     {
         IEnumerable<Vector2> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolygon()
     {
         var first = PolygonF.Empty;
         first.AddVertices(new[] {new PointF(1, 2), new PointF(3, 4)});
 
         var second = new PolygonF(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.That(first.VertexCount, Is.EqualTo(2));
+        Assert.That(second.VertexCount, Is.EqualTo(2));
 
         // we cannot use CollectionAssert here for reasons I am not entirely sure of.
         // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+        CollectionAssert.AreEqual(first.Vertices, second.Vertices);
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
         PolygonF polygon = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(polygon));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(polygon));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolygons()
     {
         var first = PolygonF.Empty;
         var second = PolygonF.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
         PolygonF first = CreateHexagon();
         PolygonF second = CreateHexagon();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolygon()
     {
         PolygonF first = CreateHexagon();
         PolygonF second = PolygonF.Empty;
 
-        Assert.AreNotEqual(first, second);
-        Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.Not.EqualTo(first));
+            Assert.That(first, Is.Not.EqualTo(second));
+            Assert.That(second != first);
+            Assert.That(first != second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygon_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => PolygonF.FromPolygon(null!));
+        Assert.Throws<ArgumentNullException>(() => PolygonF.FromPolygon(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenEmptyPolygon()
     {
-        Assert.IsFalse(PolygonF.Empty.IsConvex);
+        Assert.That(PolygonF.Empty.IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeTrue_GivenHexagon()
     {
-        Assert.IsTrue(CreateHexagon().IsConvex);
+        Assert.That(CreateHexagon().IsConvex, Is.True);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenConcavePolygon()
     {
-        Assert.IsFalse(CreateConcavePolygon().IsConvex);
+        Assert.That(CreateConcavePolygon().IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         PolygonF polygon = CreateHexagon();
         Polygon converted = (Polygon)polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.IsConvex, converted.IsConvex);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(polygon.Vertices.SequenceEqual(converted.Vertices.Select(p => (PointF)p)));
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Polygon)polygon));
+            Assert.That(converted.IsConvex, Is.EqualTo(polygon.IsConvex));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(polygon.Vertices, converted.Vertices.Select(p => (PointF)p));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         Polygon polygon = PolygonTests.CreateHexagon();
         PolygonF converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.IsConvex, converted.IsConvex);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(p => (PointF)p)));
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((PolygonF)polygon));
+            Assert.That(converted == polygon);
+            Assert.That(converted.IsConvex, Is.EqualTo(polygon.IsConvex));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p => (PointF)p));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolygonFWith1Point()
     {
         var polygon = new PolygonF();
         polygon.AddVertex(new Point(1, 1));
 
-        Assert.AreEqual(1, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(1));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolygon()
     {
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = PolygonF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, PolygonF.Empty.GetHashCode());
+        Assert.That(PolygonF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    internal static PolygonF CreateHexagon()
+    private static PolygonF CreateHexagon()
     {
         var hexagon = new PolygonF();
         hexagon.AddVertex(new Vector2(0, 0));
@@ -234,7 +236,7 @@ public class PolygonFTests
         return hexagon;
     }
 
-    internal static PolygonF CreateConcavePolygon()
+    private static PolygonF CreateConcavePolygon()
     {
         var hexagon = new PolygonF();
         hexagon.AddVertex(new Vector2(0, 0));

X10D.Tests/src/Drawing/PolygonTests.cs

@@ -1,136 +1,131 @@
 using System.Drawing;
-using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class PolygonTests
+[TestFixture]
+internal class PolygonTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
-
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerable()
     {
         var polygon = Polygon.Empty;
         IEnumerable<Point> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
 
         polygon.ClearVertices();
-        Assert.AreEqual(0, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolygon()
     {
         var pointPolygon = new Polygon(new[] {new Point(1, 2), new Point(3, 4)});
 
-        Assert.AreEqual(2, pointPolygon.VertexCount);
+        Assert.That(pointPolygon.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfPoint()
     {
         IEnumerable<Point> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polygon(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new Polygon(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolygon()
     {
         var first = Polygon.Empty;
         first.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
 
         var second = new Polygon(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.That(first.VertexCount, Is.EqualTo(2));
+        Assert.That(second.VertexCount, Is.EqualTo(2));
 
         // we cannot use CollectionAssert here for reasons I am not entirely sure of.
         // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+        Assert.That(first.Vertices.SequenceEqual(second.Vertices));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldThrowArgumentNullException_GivenNullPolygon()
     {
         Polygon polygon = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polygon(polygon));
+        Assert.Throws<ArgumentNullException>(() => _ = new Polygon(polygon));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolygons()
     {
         var first = Polygon.Empty;
         var second = Polygon.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
         Polygon first = CreateHexagon();
         Polygon second = CreateHexagon();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolygon()
     {
         Polygon first = CreateHexagon();
         Polygon second = Polygon.Empty;
 
-        Assert.AreNotEqual(first, second);
-        Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.Not.EqualTo(first));
+            Assert.That(first, Is.Not.EqualTo(second));
+            Assert.That(second != first);
+            Assert.That(first != second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldReturnEquivalentPolygon_GivenPolygon()
     {
         PolygonF hexagon = CreateHexagonF();
@@ -138,57 +133,57 @@ public class PolygonTests
         Polygon expected = CreateHexagon();
         Polygon actual = Polygon.FromPolygonF(hexagon);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldThrowArgumentNullException_GivenNullPolygon()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polygon.FromPolygonF(null!));
+        Assert.Throws<ArgumentNullException>(() => Polygon.FromPolygonF(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenEmptyPolygon()
     {
-        Assert.IsFalse(Polygon.Empty.IsConvex);
+        Assert.That(Polygon.Empty.IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeTrue_GivenHexagon()
     {
-        Assert.IsTrue(CreateHexagon().IsConvex);
+        Assert.That(CreateHexagon().IsConvex);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenConcavePolygon()
     {
-        Assert.IsFalse(CreateConcavePolygon().IsConvex);
+        Assert.That(CreateConcavePolygon().IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolygonWith1Point()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertex(new Point(1, 1));
 
-        Assert.AreEqual(1, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(1));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolygon()
     {
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Polygon.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Polygon.Empty.GetHashCode());
+        Assert.That(Polygon.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
     internal static Polygon CreateHexagon()

X10D.Tests/src/Drawing/PolyhedronTests.cs

@@ -1,196 +1,221 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class PolyhedronTests
+[TestFixture]
+internal class PolyhedronTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polyhedron = Polyhedron.Empty;
         polyhedron.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
+
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector3()
     {
         var polygon = Polyhedron.Empty;
         IEnumerable<Vector3> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polyhedron = Polyhedron.Empty;
         polyhedron.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
 
         polyhedron.ClearVertices();
-        Assert.AreEqual(0, polyhedron.VertexCount);
+        Assert.That(polyhedron.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolyhedron()
     {
         var polyhedron = new Polyhedron(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
+        Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector3()
     {
         IEnumerable<Vector3> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polyhedron(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new Polyhedron(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolyhedron()
     {
         var first = Polyhedron.Empty;
         first.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
 
         var second = new Polyhedron(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(first.VertexCount, Is.EqualTo(2));
+            Assert.That(second.VertexCount, Is.EqualTo(2));
 
-        // we cannot use CollectionAssert here for reasons I am not entirely sure of.
-        // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+            // we cannot use CollectionAssert here for reasons I am not entirely sure of.
+            // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
+            CollectionAssert.AreEqual(first.Vertices, second.Vertices);
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolyhedrons()
     {
         var first = Polyhedron.Empty;
         var second = Polyhedron.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
-        Polyhedron first = CreateHexagon();
-        Polyhedron second = CreateHexagon();
+        Polyhedron first = CreateHexagonPolyhedron();
+        Polyhedron second = CreateHexagonPolyhedron();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+            Assert.That(second == first);
+            Assert.That(first == second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolyhedron()
     {
-        Polyhedron first = CreateHexagon();
+        Polyhedron first = CreateHexagonPolyhedron();
         Polyhedron second = Polyhedron.Empty;
 
-        Assert.AreNotEqual(first, second);
-        Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.Not.EqualTo(first));
+            Assert.That(first, Is.Not.EqualTo(second));
+            Assert.That(second != first);
+            Assert.That(first != second);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygon_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polyhedron.FromPolygon(null!));
+        Assert.Throws<ArgumentNullException>(() => Polyhedron.FromPolygon(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polyhedron.FromPolygonF(null!));
+        Assert.Throws<ArgumentNullException>(() => Polyhedron.FromPolygonF(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentPolyhedron_GivenPolyhedron()
     {
         Polygon polygon = PolygonTests.CreateHexagon();
         Polyhedron converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(p =>
+        Assert.Multiple(() =>
         {
-            var point = p.ToVector2();
-            return new Vector3(point.X, point.Y, 0);
-        })));
+            Assert.That(converted, Is.EqualTo((Polyhedron)polygon));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p =>
+            {
+                var point = p.ToVector2();
+                return new Vector3(point.X, point.Y, 0);
+            }));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentPolyhedron_GivenPolyhedronF()
     {
-        PolygonF polygon = PolygonFTests.CreateHexagon();
+        PolygonF polygon = CreateHexagonPolygon();
         Polyhedron converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(v =>
+        Assert.Multiple(() =>
         {
-            var point = v.ToVector2();
-            return new Vector3(point.X, point.Y, 0);
-        })));
+            Assert.That(converted, Is.EqualTo((Polyhedron)polygon));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p =>
+            {
+                var point = p.ToVector2();
+                return new Vector3(point.X, point.Y, 0);
+            }));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolyhedronWith1Point()
     {
         var polyhedron = new Polyhedron();
         polyhedron.AddVertex(Vector3.One);
 
-        Assert.AreEqual(1, polyhedron.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(1));
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolyhedron()
     {
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+        Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Polyhedron.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Polyhedron.Empty.GetHashCode());
+        Assert.That(Polyhedron.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    internal static Polyhedron CreateHexagon()
+    private static PolygonF CreateHexagonPolygon()
+    {
+        var hexagon = new PolygonF();
+        hexagon.AddVertex(new Vector2(0, 0));
+        hexagon.AddVertex(new Vector2(1, 0));
+        hexagon.AddVertex(new Vector2(1, 1));
+        hexagon.AddVertex(new Vector2(0, 1));
+        hexagon.AddVertex(new Vector2(-1, 1));
+        hexagon.AddVertex(new Vector2(-1, 0));
+        return hexagon;
+    }
+
+    private static Polyhedron CreateHexagonPolyhedron()
     {
         var hexagon = new Polyhedron();
         hexagon.AddVertex(new Vector3(0, 0, 0));
@@ -202,7 +227,7 @@ public class PolyhedronTests
         return hexagon;
     }
 
-    internal static Polyhedron CreateConcavePolyhedron()
+    private static Polyhedron CreateConcavePolyhedron()
     {
         var hexagon = new Polyhedron();
         hexagon.AddVertex(new Vector3(0, 0, 0));

X10D.Tests/src/Drawing/RandomTests.cs

@@ -1,37 +1,37 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class RandomTests
+[TestFixture]
+internal class RandomTests
 {
-    [TestMethod]
+    [Test]
     public void NextColorArgb_ShouldReturn331515e5_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(Color.FromArgb(51, 21, 21, 229), random.NextColorArgb());
+        Assert.That(random.NextColorArgb(), Is.EqualTo(Color.FromArgb(51, 21, 21, 229)));
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorArgb_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorArgb());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextColorArgb());
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorRgb_ShouldReturn1515e5_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(Color.FromArgb(255, 21, 21, 229), random.NextColorRgb());
+        Assert.That(random.NextColorRgb(), Is.EqualTo(Color.FromArgb(255, 21, 21, 229)));
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorRgb_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorRgb());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextColorRgb());
     }
 }

X10D.Tests/src/Drawing/SizeTests.cs

@@ -1,42 +1,51 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class SizeTests
+[TestFixture]
+internal class SizeTests
 {
-    [TestMethod]
+    [Test]
     public void ToPoint_ShouldReturnPoint_WithEquivalentMembers()
     {
         var random = new Random();
         var size = new Size(random.Next(), random.Next());
         var point = size.ToPoint();
 
-        Assert.AreEqual(size.Width, point.X);
-        Assert.AreEqual(size.Height, point.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.X, Is.EqualTo(size.Width));
+            Assert.That(point.Y, Is.EqualTo(size.Height));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToPointF_ShouldReturnPoint_WithEquivalentMembers()
     {
         var random = new Random();
         var size = new Size(random.Next(), random.Next());
         var point = size.ToPointF();
 
-        Assert.AreEqual(size.Width, point.X, 1e-6f);
-        Assert.AreEqual(size.Height, point.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.X, Is.EqualTo(size.Width).Within(1e-6f));
+            Assert.That(point.Y, Is.EqualTo(size.Height).Within(1e-6f));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToVector2_ShouldReturnVector_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Size(random.Next(), random.Next());
         var size = point.ToVector2();
 
-        Assert.AreEqual(point.Width, size.X, 1e-6f);
-        Assert.AreEqual(point.Height, size.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.X, Is.EqualTo(point.Width).Within(1e-6f));
+            Assert.That(size.Y, Is.EqualTo(point.Height).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/SphereTests.cs

@@ -1,135 +1,142 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
-public class SphereTests
+[TestFixture]
+internal class SphereTests
 {
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitSphere = Sphere.Unit;
-        Assert.AreEqual(2.0f * MathF.PI * unitSphere.Radius, unitSphere.Circumference, 1e-6f);
+        Assert.That(unitSphere.Circumference, Is.EqualTo(2.0f * MathF.PI * unitSphere.Radius).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, Sphere.Empty.CompareTo(Sphere.Unit));
+        Assert.That(Sphere.Empty.CompareTo(Sphere.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, Sphere.Unit.CompareTo(Sphere.Empty));
+        Assert.That(Sphere.Unit.CompareTo(Sphere.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, Sphere.Empty.CompareTo((object)Sphere.Unit));
+        Assert.That(Sphere.Empty.CompareTo((object)Sphere.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Sphere.Unit.CompareTo(null));
+        Assert.That(Sphere.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = Sphere.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Sphere.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Sphere.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitSphere()
     {
-        Assert.AreEqual(2.0f, Sphere.Unit.Diameter, 1e-6f);
+        Assert.That(Sphere.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = Sphere.Unit;
         var unitCircle2 = Sphere.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+            Assert.That(unitCircle2 == unitCircle1);
+            Assert.That(unitCircle1 == unitCircle2);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Sphere.Unit.Equals(null));
+        Assert.That(Sphere.Unit, Is.Not.EqualTo(null));
+        Assert.That(Sphere.Unit.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(Sphere.Unit, Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit == Sphere.Empty);
-        Assert.IsTrue(Sphere.Unit != Sphere.Empty);
+        Assert.That(Sphere.Empty, Is.Not.EqualTo(Sphere.Unit));
+        Assert.That(Sphere.Unit, Is.Not.EqualTo(Sphere.Empty));
+        Assert.That(Sphere.Empty != Sphere.Unit);
+        Assert.That(Sphere.Unit != Sphere.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Sphere.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Sphere.Empty.GetHashCode());
+        Assert.That(Sphere.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Sphere.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Sphere.Unit.GetHashCode());
+        Assert.That(Sphere.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Sphere.Unit > Sphere.Empty);
-        Assert.IsTrue(Sphere.Unit >= Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit < Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit <= Sphere.Empty);
+        Assert.That(Sphere.Unit, Is.GreaterThan(Sphere.Empty));
+        Assert.That(Sphere.Unit, Is.GreaterThanOrEqualTo(Sphere.Empty));
+        Assert.That(Sphere.Unit > Sphere.Empty);
+        Assert.That(Sphere.Unit >= Sphere.Empty);
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Sphere.Empty < Sphere.Unit);
-        Assert.IsTrue(Sphere.Empty <= Sphere.Unit);
-        Assert.IsFalse(Sphere.Empty > Sphere.Unit);
-        Assert.IsFalse(Sphere.Empty >= Sphere.Unit);
+        Assert.That(Sphere.Empty, Is.LessThan(Sphere.Unit));
+        Assert.That(Sphere.Empty, Is.LessThanOrEqualTo(Sphere.Unit));
+        Assert.That(Sphere.Empty < Sphere.Unit);
+        Assert.That(Sphere.Empty <= Sphere.Unit);
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptySphere()
     {
-        Assert.AreEqual(0, Sphere.Empty.Radius);
+        Assert.That(Sphere.Empty.Radius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitSphere()
     {
-        Assert.AreEqual(1, Sphere.Unit.Radius);
+        Assert.That(Sphere.Unit.Radius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Volume_ShouldBe4Over3TimesPi_GivenUnitCircle()
     {
         var unitSphere = Sphere.Unit;
-        Assert.AreEqual(4.0f / 3.0f * MathF.PI, unitSphere.Volume);
+        Assert.That(unitSphere.Volume, Is.EqualTo(4.0f / 3.0f * MathF.PI));
     }
 }

X10D.Tests/src/Hosting/ServiceCollectionTests.cs

@@ -1,14 +1,14 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Hosting.DependencyInjection;
 
 namespace X10D.Tests.Hosting;
 
-[TestClass]
-public class ServiceCollectionTests
+[TestFixture]
+internal class ServiceCollectionTests
 {
-    [TestMethod]
+    [Test]
     public void AddHostedSingleton_ShouldRegisterServiceAsSingletonAndAsHostedService()
     {
         var services = new ServiceCollection();
@@ -19,14 +19,38 @@ public class ServiceCollectionTests
         var service = serviceProvider.GetService<TestService>();
         var hostedService = serviceProvider.GetService<IHostedService>();
 
-        Assert.IsNotNull(service);
-        Assert.IsNotNull(hostedService);
-        Assert.IsInstanceOfType(service, typeof(TestService));
-        Assert.IsInstanceOfType(hostedService, typeof(TestService));
-        Assert.AreSame(service, hostedService);
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
     }
 
-    [TestMethod]
+    [Test]
+    public void AddHostedSingleton_ShouldRegisterServiceAsSingletonAndAsHostedService_GivenServiceAndImplTypes()
+    {
+        var services = new ServiceCollection();
+
+        services.AddHostedSingleton<ITestService, TestService>();
+
+        var serviceProvider = services.BuildServiceProvider();
+        var service = serviceProvider.GetService<ITestService>();
+        var hostedService = serviceProvider.GetService<IHostedService>();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
+    }
+
+    [Test]
     public void AddHostedSingleton_ShouldRegisterServiceTypeAsSingletonAndAsHostedService()
     {
         var services = new ServiceCollection();
@@ -37,15 +61,48 @@ public class ServiceCollectionTests
         var service = serviceProvider.GetService<TestService>();
         var hostedService = serviceProvider.GetService<IHostedService>();
 
-        Assert.IsNotNull(service);
-        Assert.IsNotNull(hostedService);
-        Assert.IsInstanceOfType(service, typeof(TestService));
-        Assert.IsInstanceOfType(hostedService, typeof(TestService));
-        Assert.AreSame(service, hostedService);
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
     }
 
-    private sealed class TestService : IHostedService
+    [Test]
+    public void AddHostedSingleton_ShouldRegisterServiceTypeAsSingletonAndAsHostedService_GivenServiceAndImplTypes()
     {
+        var services = new ServiceCollection();
+
+        services.AddHostedSingleton(typeof(ITestService), typeof(TestService));
+
+        var serviceProvider = services.BuildServiceProvider();
+        var service = serviceProvider.GetService<ITestService>();
+        var hostedService = serviceProvider.GetService<IHostedService>();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
+    }
+
+    private interface ITestService
+    {
+        void Foo();
+    }
+
+    private sealed class TestService : ITestService, IHostedService
+    {
+        public void Foo()
+        {
+        }
+
         public Task StartAsync(CancellationToken cancellationToken)
         {
             return Task.CompletedTask;

X10D.Tests/src/IO/BooleanTests.cs

@@ -1,32 +1,32 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class BooleanTests
+[TestFixture]
+internal class BooleanTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContaining1()
     {
         const bool value = true;
         CollectionAssert.AreEqual(new byte[] {1}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContaining1_GivenLargeEnoughSpan()
     {
         const bool value = true;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new byte[] {1}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const bool value = true;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/ByteTests.cs

@@ -1,32 +1,32 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class ByteTests
+[TestFixture]
+internal class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContainingItself()
     {
         const byte value = 0xFF;
         CollectionAssert.AreEqual(new[] {value}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContainingItself_GivenLargeEnoughSpan()
     {
         const byte value = 0xFF;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new[] {value}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const byte value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/DirectoryInfoTests.cs

@@ -1,19 +1,19 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class DirectoryInfoTests
+[TestFixture]
+internal class DirectoryInfoTests
 {
-    [TestMethod]
+    [Test]
     public void Clear_ShouldClear_GivenValidDirectory()
     {
         string tempDirectoryPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
         var tempDirectory = new DirectoryInfo(tempDirectoryPath);
 
         tempDirectory.Create();
-        Assert.IsTrue(tempDirectory.Exists);
+        Assert.That(tempDirectory.Exists);
 
         var file = new FileInfo(Path.Combine(tempDirectory.FullName, "file"));
         file.Create().Close();
@@ -24,34 +24,42 @@ public class DirectoryInfoTests
         var childFile = new FileInfo(Path.Combine(childDirectory.FullName, "childFile"));
         childFile.Create().Close();
 
-        Assert.AreEqual(1, tempDirectory.GetFiles().Length);
-        Assert.AreEqual(1, tempDirectory.GetDirectories().Length);
+        Assert.Multiple(() =>
+        {
+            Assert.That(tempDirectory.GetFiles(), Has.Length.EqualTo(1));
+            Assert.That(tempDirectory.GetDirectories(), Has.Length.EqualTo(1));
+        });
+
         tempDirectory.Clear();
-        Assert.AreEqual(0, tempDirectory.GetFiles().Length);
-        Assert.AreEqual(0, tempDirectory.GetDirectories().Length);
-        Assert.IsTrue(tempDirectory.Exists);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(tempDirectory.GetFiles(), Is.Empty);
+            Assert.That(tempDirectory.GetDirectories(), Is.Empty);
+            Assert.That(tempDirectory.Exists);
+        });
 
         tempDirectory.Delete();
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowArgumentNullException_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((DirectoryInfo?)null)!.Clear());
+        Assert.Throws<ArgumentNullException>(() => ((DirectoryInfo?)null)!.Clear());
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowDirectoryNotFoundException_GivenInvalidDirectory()
     {
         var directory = new DirectoryInfo(@"123:/@12#3");
-        Assert.ThrowsException<DirectoryNotFoundException>(() => directory.Clear());
+        Assert.Throws<DirectoryNotFoundException>(() => directory.Clear());
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowDirectoryNotFoundException_GivenNonExistentDirectory()
     {
         var directory = new DirectoryInfo(@"/@12#3");
-        Assert.IsFalse(directory.Exists);
-        Assert.ThrowsException<DirectoryNotFoundException>(() => directory.Clear());
+        Assert.That(directory.Exists, Is.False);
+        Assert.Throws<DirectoryNotFoundException>(() => directory.Clear());
     }
 }

X10D.Tests/src/IO/DoubleTests.cs

@@ -1,66 +1,66 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class DoubleTests
+[TestFixture]
+internal class DoubleTests
 {
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue()
+    [Test]
+    public void GetBigEndianBytes_ReturnsCorrectValue()
     {
         const double value = 42.5;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0, 0, 0, 0, 0, 0x40, 0x45, 0x40}
-            : new byte[] {0x40, 0x45, 0x40, 0, 0, 0, 0, 0};
-        CollectionAssert.AreEqual(bytes, value.GetBytes());
+
+        var expected = new byte[] { 0x40, 0x45, 0x40, 0, 0, 0, 0, 0 };
+        byte[] actual = value.GetBigEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue_WithEndianness()
+    [Test]
+    public void GetLittleEndianBytes_ReturnsCorrectValue()
     {
         const double value = 42.5;
-        byte[] littleEndian = {0, 0, 0, 0, 0, 0x40, 0x45, 0x40};
-        byte[] bigEndian = {0x40, 0x45, 0x40, 0, 0, 0, 0, 0};
 
-        CollectionAssert.AreEqual(littleEndian, value.GetBytes(Endianness.LittleEndian));
-        CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
+        var expected = new byte[] { 0, 0, 0, 0, 0, 0x40, 0x45, 0x40 };
+        byte[] actual = value.GetLittleEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const double value = 42.5;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0, 0, 0, 0, 0, 0x40, 0x45, 0x40}
-            : new byte[] {0x40, 0x45, 0x40, 0, 0, 0, 0, 0};
 
-        Span<byte> buffer = stackalloc byte[8];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
-        CollectionAssert.AreEqual(bytes, buffer.ToArray());
+        var expected = new byte[] { 0x40, 0x45, 0x40, 0, 0, 0, 0, 0 };
+        Span<byte> actual = stackalloc byte[8];
+        Assert.That(value.TryWriteBigEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
+    [Test]
+    public void TryWriteLittleEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const double value = 42.5;
-        byte[] littleEndian = {0, 0, 0, 0, 0, 0x40, 0x45, 0x40};
-        byte[] bigEndian = {0x40, 0x45, 0x40, 0, 0, 0, 0, 0};
 
-        Span<byte> buffer = stackalloc byte[8];
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
-        CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
-        CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
+        var expected = new byte[] { 0, 0, 0, 0, 0, 0x40, 0x45, 0x40 };
+        Span<byte> actual = stackalloc byte[8];
+        Assert.That(value.TryWriteLittleEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsFalse_GivenSmallSpan()
     {
         const double value = 42.5;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBigEndian(buffer), Is.False);
+    }
+
+    [Test]
+    public void TryWriteLittleEndian_RReturnsFalse_GivenSmallSpan()
+    {
+        const double value = 42.5;
+        Span<byte> buffer = stackalloc byte[0];
+        Assert.That(value.TryWriteLittleEndian(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/FileInfoTests.cs

@@ -1,23 +1,23 @@
 using System.Security.Cryptography;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class FileInfoTests
+[TestFixture]
+internal class FileInfoTests
 {
-    [TestMethod]
+    [Test]
     public void GetHashSha1ShouldBeCorrect()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         File.WriteAllText(fileName, "Hello World");
-        Assert.IsTrue(File.Exists(fileName));
+        Assert.That(File.Exists(fileName));
 
         // SHA-1
         byte[] expectedHash =
@@ -37,17 +37,17 @@ public class FileInfoTests
         }
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteHashSha1ShouldBeCorrect()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         File.WriteAllText(fileName, "Hello World");
-        Assert.IsTrue(File.Exists(fileName));
+        Assert.That(File.Exists(fileName));
 
         // SHA-1
         byte[] expectedHash =
@@ -60,7 +60,7 @@ public class FileInfoTests
         {
             Span<byte> hash = stackalloc byte[20];
             new FileInfo(fileName).TryWriteHash<SHA1>(hash, out int bytesWritten);
-            Assert.AreEqual(expectedHash.Length, bytesWritten);
+            Assert.That(bytesWritten, Is.EqualTo(expectedHash.Length));
             CollectionAssert.AreEqual(expectedHash, hash.ToArray());
         }
         finally
@@ -69,25 +69,25 @@ public class FileInfoTests
         }
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashNullShouldThrow()
     {
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<ArgumentNullException>(() => ((FileInfo?)null)!.GetHash<SHA1>());
-        Assert.ThrowsException<ArgumentNullException>(() => ((FileInfo?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<ArgumentNullException>(() => _ = ((FileInfo?)null)!.GetHash<SHA1>());
+        Assert.Throws<ArgumentNullException>(() => ((FileInfo?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashInvalidFileShouldThrow()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<FileNotFoundException>(() => new FileInfo(fileName).GetHash<SHA1>());
-        Assert.ThrowsException<FileNotFoundException>(() => new FileInfo(fileName).TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<FileNotFoundException>(() => _ = new FileInfo(fileName).GetHash<SHA1>());
+        Assert.Throws<FileNotFoundException>(() => new FileInfo(fileName).TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 }

X10D.Tests/src/IO/Int16Tests.cs

@@ -1,62 +1,66 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class Int16Tests
+[TestFixture]
+internal class Int16Tests
 {
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue()
+    [Test]
+    public void GetLittleEndianBytes_ReturnsCorrectValue()
     {
         const short value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0} : new byte[] {0, 0x0F};
-        CollectionAssert.AreEqual(bytes, value.GetBytes());
+
+        byte[] expected = { 0x0F, 0 };
+        byte[] actual = value.GetLittleEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue_WithEndianness()
+    [Test]
+    public void GetBigEndianBytes_ReturnsCorrectValue()
     {
         const short value = 0x0F;
-        byte[] littleEndian = {0x0F, 0};
-        byte[] bigEndian = {0, 0x0F};
 
-        CollectionAssert.AreEqual(littleEndian, value.GetBytes(Endianness.LittleEndian));
-        CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
+        byte[] expected = { 0, 0x0F };
+        byte[] actual = value.GetBigEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
+    [Test]
+    public void TryWriteLittleEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const short value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0} : new byte[] {0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[2];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
-        CollectionAssert.AreEqual(bytes, buffer.ToArray());
+        byte[] expected = { 0x0F, 0 };
+        Span<byte> actual = stackalloc byte[2];
+        Assert.That(value.TryWriteLittleEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
+    [Test]
+    public void TryWriteBigEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const short value = 0x0F;
-        byte[] littleEndian = {0x0F, 0};
-        byte[] bigEndian = {0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[2];
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
-        CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
-        CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
+        byte[] expected = { 0, 0x0F };
+        Span<byte> actual = stackalloc byte[2];
+        Assert.That(value.TryWriteBigEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
+    [Test]
+    public void TryWriteLittleEndian_RReturnsFalse_GivenSmallSpan()
     {
         const short value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteLittleEndian(buffer), Is.False);
+    }
+
+    [Test]
+    public void TryWriteBigEndian_ReturnsFalse_GivenSmallSpan()
+    {
+        const short value = 0x0F;
+        Span<byte> buffer = stackalloc byte[0];
+        Assert.That(value.TryWriteBigEndian(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/Int32Tests.cs

@@ -1,62 +1,66 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class Int32Tests
+[TestFixture]
+internal class Int32Tests
 {
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue()
+    [Test]
+    public void GetBigEndianBytes_ReturnsCorrectValue()
     {
         const int value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0, 0, 0} : new byte[] {0, 0, 0, 0x0F};
-        CollectionAssert.AreEqual(bytes, value.GetBytes());
+
+        var expected = new byte[] { 0, 0, 0, 0x0F };
+        byte[] actual = value.GetBigEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue_WithEndianness()
+    [Test]
+    public void GetLittleEndianBytes_ReturnsCorrectValue()
     {
         const int value = 0x0F;
-        byte[] littleEndian = {0x0F, 0, 0, 0};
-        byte[] bigEndian = {0, 0, 0, 0x0F};
 
-        CollectionAssert.AreEqual(littleEndian, value.GetBytes(Endianness.LittleEndian));
-        CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
+        var expected = new byte[] { 0x0F, 0, 0, 0 };
+        byte[] actual = value.GetLittleEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const int value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0, 0, 0} : new byte[] {0, 0, 0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[4];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
-        CollectionAssert.AreEqual(bytes, buffer.ToArray());
+        var expected = new byte[] { 0, 0, 0, 0x0F };
+        Span<byte> actual = stackalloc byte[4];
+        Assert.That(value.TryWriteBigEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
+    [Test]
+    public void TryWriteLittleEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const int value = 0x0F;
-        byte[] littleEndian = {0x0F, 0, 0, 0};
-        byte[] bigEndian = {0, 0, 0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[4];
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
-        CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
-        CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
+        var expected = new byte[] { 0x0F, 0, 0, 0 };
+        Span<byte> actual = stackalloc byte[4];
+        Assert.That(value.TryWriteLittleEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsFalse_GivenSmallSpan()
     {
         const int value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBigEndian(buffer), Is.False);
+    }
+
+    [Test]
+    public void TryWriteLittleEndian_RReturnsFalse_GivenSmallSpan()
+    {
+        const int value = 0x0F;
+        Span<byte> buffer = stackalloc byte[0];
+        Assert.That(value.TryWriteLittleEndian(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/Int64Tests.cs

@@ -1,66 +1,66 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class Int64Tests
+[TestFixture]
+internal class Int64Tests
 {
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue()
+    [Test]
+    public void GetLittleEndianBytes_ReturnsCorrectValue()
     {
         const long value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0x0F, 0, 0, 0, 0, 0, 0, 0}
-            : new byte[] {0, 0, 0, 0, 0, 0, 0, 0x0F};
-        CollectionAssert.AreEqual(bytes, value.GetBytes());
+
+        byte[] expected = { 0x0F, 0, 0, 0, 0, 0, 0, 0 };
+        byte[] actual = value.GetLittleEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue_WithEndianness()
+    [Test]
+    public void GetBigEndianBytes_ReturnsCorrectValue()
     {
         const long value = 0x0F;
-        byte[] littleEndian = {0x0F, 0, 0, 0, 0, 0, 0, 0};
-        byte[] bigEndian = {0, 0, 0, 0, 0, 0, 0, 0x0F};
 
-        CollectionAssert.AreEqual(littleEndian, value.GetBytes(Endianness.LittleEndian));
-        CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
+        byte[] expected = { 0, 0, 0, 0, 0, 0, 0, 0x0F };
+        byte[] actual = value.GetBigEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
+    [Test]
+    public void TryWriteLittleEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const long value = 0x0F;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0x0F, 0, 0, 0, 0, 0, 0, 0}
-            : new byte[] {0, 0, 0, 0, 0, 0, 0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[8];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
-        CollectionAssert.AreEqual(bytes, buffer.ToArray());
+        byte[] expected = { 0x0F, 0, 0, 0, 0, 0, 0, 0 };
+        Span<byte> actual = stackalloc byte[8];
+        Assert.That(value.TryWriteLittleEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
+    [Test]
+    public void TryWriteBigEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const long value = 0x0F;
-        byte[] littleEndian = {0x0F, 0, 0, 0, 0, 0, 0, 0};
-        byte[] bigEndian = {0, 0, 0, 0, 0, 0, 0, 0x0F};
 
-        Span<byte> buffer = stackalloc byte[8];
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
-        CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
-        CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
+        byte[] expected = { 0, 0, 0, 0, 0, 0, 0, 0x0F };
+        Span<byte> actual = stackalloc byte[8];
+        Assert.That(value.TryWriteBigEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
+    [Test]
+    public void TryWriteLittleEndian_RReturnsFalse_GivenSmallSpan()
     {
         const long value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteLittleEndian(buffer), Is.False);
+    }
+
+    [Test]
+    public void TryWriteBigEndian_ReturnsFalse_GivenSmallSpan()
+    {
+        const long value = 0x0F;
+        Span<byte> buffer = stackalloc byte[0];
+        Assert.That(value.TryWriteBigEndian(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/ListOfByteTests.cs

@@ -1,27 +1,27 @@
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class ListOfByteTests
+[TestFixture]
+internal class ListOfByteTests
 {
-    [TestMethod]
+    [Test]
     public void AsString_ShouldReturnBytes_GivenBytes()
     {
         var bytes = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05};
-        Assert.AreEqual("01-02-03-04-05", bytes.AsString());
+        Assert.That(bytes.AsString(), Is.EqualTo("01-02-03-04-05"));
     }
 
-    [TestMethod]
+    [Test]
     public void AsString_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.AsString());
+        Assert.Throws<ArgumentNullException>(() => bytes!.AsString());
     }
 
-    [TestMethod]
+    [Test]
     public void ToDouble_ShouldReturnDouble_GivenBytes()
     {
         var bytes = new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40};
@@ -31,59 +31,59 @@ public class ListOfByteTests
             Array.Reverse(bytes);
         }
 
-        Assert.AreEqual(420.0, bytes.ToDouble(), 1e-6);
+        Assert.That(bytes.ToDouble(), Is.EqualTo(420.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void ToDouble_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToDouble());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToDouble());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt16_ShouldReturnInt16_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01};
-        Assert.AreEqual(420, bytes.ToInt16());
+        Assert.That(bytes.ToInt16(), Is.EqualTo(420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt16_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt16());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToInt16());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt32_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00};
-        Assert.AreEqual(420, bytes.ToInt32());
+        Assert.That(bytes.ToInt32(), Is.EqualTo(420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt32_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt32());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToInt32());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt64_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-        Assert.AreEqual(420L, bytes.ToInt64());
+        Assert.That(bytes.ToInt64(), Is.EqualTo(420L));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt64_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt64());
+        Assert.Throws<ArgumentNullException>(() => bytes!.ToInt64());
     }
 
-    [TestMethod]
+    [Test]
     public void ToSingle_ShouldReturnDouble_GivenBytes()
     {
         var bytes = new byte[] {0x00, 0x00, 0xD2, 0x43};
@@ -93,76 +93,76 @@ public class ListOfByteTests
             Array.Reverse(bytes);
         }
 
-        Assert.AreEqual(420.0, bytes.ToSingle(), 1e-6);
+        Assert.That(bytes.ToSingle(), Is.EqualTo(420.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void ToSingle_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToSingle());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToSingle());
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldReturnHelloWorld_GivenUTF8()
     {
         var bytes = new byte[] {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64};
-        Assert.AreEqual("Hello World", bytes.ToString(Encoding.UTF8));
+        Assert.That(bytes.ToString(Encoding.UTF8), Is.EqualTo("Hello World"));
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToString(Encoding.UTF8));
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToString(Encoding.UTF8));
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldThrow_GivenNullEncoding()
     {
         var bytes = new byte[] {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64};
-        Assert.ThrowsException<ArgumentNullException>(() => bytes.ToString(null!));
+        Assert.Throws<ArgumentNullException>(() => bytes.ToString(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt16_ShouldReturnInt16_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01};
-        Assert.AreEqual((ushort)420, bytes.ToUInt16());
+        Assert.That(bytes.ToUInt16(), Is.EqualTo((ushort)420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt16_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt16());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToUInt16());
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt32_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00};
-        Assert.AreEqual(420U, bytes.ToUInt32());
+        Assert.That(bytes.ToUInt32(), Is.EqualTo(420U));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt32_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt32());
+        Assert.Throws<ArgumentNullException>(() => bytes!.ToUInt32());
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt64_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-        Assert.AreEqual(420UL, bytes.ToUInt64());
+        Assert.That(bytes.ToUInt64(), Is.EqualTo(420UL));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt64_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt64());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToUInt64());
     }
 }

X10D.Tests/src/IO/SByteTests.cs

@@ -1,33 +1,32 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-[CLSCompliant(false)]
-public class SByteTests
+[TestFixture]
+internal class SByteTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContainingItself()
     {
         const sbyte value = 0x0F;
         CollectionAssert.AreEqual(new[] {(byte)value}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContainingItself_GivenLargeEnoughSpan()
     {
         const sbyte value = 0x0F;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new[] {(byte)value}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const sbyte value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/SingleTests.cs

@@ -1,66 +1,66 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class SingleTests
+[TestFixture]
+internal class SingleTests
 {
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue()
+    [Test]
+    public void GetBigEndianBytes_ReturnsCorrectValue()
     {
         const float value = 42.5f;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0, 0, 0x2A, 0x42}
-            : new byte[] {0x42, 0x2A, 0, 0};
-        CollectionAssert.AreEqual(bytes, value.GetBytes());
+
+        var expected = new byte[] { 0x42, 0x2A, 0, 0 };
+        byte[] actual = value.GetBigEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void GetBytes_ReturnsCorrectValue_WithEndianness()
+    [Test]
+    public void GetLittleEndianBytes_ReturnsCorrectValue()
     {
         const float value = 42.5f;
-        byte[] littleEndian = {0, 0, 0x2A, 0x42};
-        byte[] bigEndian = {0x42, 0x2A, 0, 0};
 
-        CollectionAssert.AreEqual(littleEndian, value.GetBytes(Endianness.LittleEndian));
-        CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
+        var expected = new byte[] { 0, 0, 0x2A, 0x42 };
+        byte[] actual = value.GetLittleEndianBytes();
+        CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const float value = 42.5f;
-        byte[] bytes = BitConverter.IsLittleEndian
-            ? new byte[] {0, 0, 0x2A, 0x42}
-            : new byte[] {0x42, 0x2A, 0, 0};
 
-        Span<byte> buffer = stackalloc byte[4];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
-        CollectionAssert.AreEqual(bytes, buffer.ToArray());
+        var expected = new byte[] { 0x42, 0x2A, 0, 0 };
+        Span<byte> actual = stackalloc byte[4];
+        Assert.That(value.TryWriteBigEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
+    [Test]
+    public void TryWriteLittleEndian_ReturnsTrue_FillsSpanCorrectly()
     {
         const float value = 42.5f;
-        byte[] littleEndian = {0, 0, 0x2A, 0x42};
-        byte[] bigEndian = {0x42, 0x2A, 0, 0};
 
-        Span<byte> buffer = stackalloc byte[4];
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
-        CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
-
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
-        CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
+        var expected = new byte[] { 0, 0, 0x2A, 0x42 };
+        Span<byte> actual = stackalloc byte[4];
+        Assert.That(value.TryWriteLittleEndian(actual));
+        CollectionAssert.AreEqual(expected, actual.ToArray());
     }
 
-    [TestMethod]
-    public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
+    [Test]
+    public void TryWriteBigEndian_ReturnsFalse_GivenSmallSpan()
     {
         const float value = 42.5f;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBigEndian(buffer), Is.False);
+    }
+
+    [Test]
+    public void TryWriteLittleEndian_RReturnsFalse_GivenSmallSpan()
+    {
+        const float value = 42.5f;
+        Span<byte> buffer = stackalloc byte[0];
+        Assert.That(value.TryWriteLittleEndian(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/StreamTests.ReadDecimal.cs

@@ -1,42 +1,43 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadDecimal_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadDecimal_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadDecimalBigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDecimalBigEndian());
     }
 
-    [TestMethod]
-    public void ReadDecimal_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadDecimalLittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadDecimal((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDecimalLittleEndian());
     }
 
-    [TestMethod]
-    public void ReadDecimal_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadDecimalBigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadDecimalBigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadDecimalLittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadDecimalLittleEndian());
+    }
+
+    [Test]
+    public void ReadDecimalBigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
         ReadOnlySpan<byte> bytes = stackalloc byte[]
@@ -47,14 +48,17 @@ public partial class StreamTests
         stream.Position = 0;
 
         const decimal expected = 420.0m;
-        decimal actual = stream.ReadDecimal(Endianness.BigEndian);
+        decimal actual = stream.ReadDecimalBigEndian();
 
-        Assert.AreEqual(16, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.Multiple(() =>
+        {
+            Assert.That(stream.Position, Is.EqualTo(16));
+            Assert.That(actual, Is.EqualTo(expected));
+        });
     }
 
-    [TestMethod]
-    public void ReadDecimal_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadDecimalLittleEndian_ShouldWriteLittleEndian()
     {
         using var stream = new MemoryStream();
         ReadOnlySpan<byte> bytes = stackalloc byte[]
@@ -65,9 +69,12 @@ public partial class StreamTests
         stream.Position = 0;
 
         const decimal expected = 420.0m;
-        decimal actual = stream.ReadDecimal(Endianness.LittleEndian);
+        decimal actual = stream.ReadDecimalLittleEndian();
 
-        Assert.AreEqual(16, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.Multiple(() =>
+        {
+            Assert.That(stream.Position, Is.EqualTo(16));
+            Assert.That(actual, Is.EqualTo(expected));
+        });
     }
 }

X10D.Tests/src/IO/StreamTests.ReadDouble.cs

@@ -1,67 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadDouble_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadDouble_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadDoubleBigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDoubleBigEndian());
     }
 
-    [TestMethod]
-    public void ReadDouble_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadDoubleLittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadDouble((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDoubleLittleEndian());
     }
 
-    [TestMethod]
-    public void ReadDouble_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadDoubleBigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadDoubleBigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadDoubleLittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadDoubleLittleEndian());
+    }
+
+    [Test]
+    public void ReadDoubleBigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x40, 0x7A, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x40, 0x7A, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const double expected = 420.0;
-        double actual = stream.ReadDouble(Endianness.BigEndian);
+        double actual = stream.ReadDoubleBigEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    public void ReadDouble_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadDoubleLittleEndian_ShouldWriteLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const double expected = 420.0;
-        double actual = stream.ReadDouble(Endianness.LittleEndian);
+        double actual = stream.ReadDoubleLittleEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt16.cs

@@ -1,67 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadInt16_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadInt16_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadInt16BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt16BigEndian());
     }
 
-    [TestMethod]
-    public void ReadInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadInt16LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt16((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt16LittleEndian());
     }
 
-    [TestMethod]
-    public void ReadInt16_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadInt16BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt16BigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadInt16LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt16LittleEndian());
+    }
+
+    [Test]
+    public void ReadInt16BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const short expected = 420;
-        short actual = stream.ReadInt16(Endianness.BigEndian);
+        short actual = stream.ReadInt16BigEndian();
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    public void ReadInt16_ShouldReadLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadInt16LittleEndian_ShouldReadLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const short expected = 420;
-        short actual = stream.ReadInt16(Endianness.LittleEndian);
+        short actual = stream.ReadInt16LittleEndian();
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt32.cs

@@ -1,67 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadInt32_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadInt32_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadInt32BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt32BigEndian());
     }
 
-    [TestMethod]
-    public void ReadInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadInt32LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt32((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt32LittleEndian());
     }
 
-    [TestMethod]
-    public void ReadInt32_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadInt32BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt32BigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadInt32LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt32LittleEndian());
+    }
+
+    [Test]
+    public void ReadInt32BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const int expected = 420;
-        int actual = stream.ReadInt32(Endianness.BigEndian);
+        int actual = stream.ReadInt32BigEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    public void ReadInt32_ShouldReadLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadInt32LittleEndian_ShouldReadLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const int expected = 420;
-        int actual = stream.ReadInt32(Endianness.LittleEndian);
+        int actual = stream.ReadInt32LittleEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt64.cs

@@ -1,67 +1,65 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadInt64_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadInt64_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadInt64BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt64BigEndian());
     }
 
-    [TestMethod]
-    public void ReadInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadInt64LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt64((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt64LittleEndian());
     }
 
-    [TestMethod]
-    public void ReadInt64_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    public void ReadInt64BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt64BigEndian());
+    }
+
+    [Test]
+    public void ReadInt64LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadInt64LittleEndian());
+    }
+
+    [Test]
+    public void ReadInt64BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const long expected = 420;
-        long actual = stream.ReadInt64(Endianness.BigEndian);
+        long actual = stream.ReadInt64BigEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    public void ReadInt64_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadInt64LittleEndian_ShouldWriteLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const long expected = 420;
-        long actual = stream.ReadInt64(Endianness.LittleEndian);
+        long actual = stream.ReadInt64LittleEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadSingle.cs

@@ -1,67 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void ReadSingle_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void ReadSingle_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadSingleBigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadSingleBigEndian());
     }
 
-    [TestMethod]
-    public void ReadSingle_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadSingleLittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadSingle((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadSingleLittleEndian());
     }
 
-    [TestMethod]
-    public void ReadSingle_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadSingleBigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadSingleBigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadSingleLittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadSingleLittleEndian());
+    }
+
+    [Test]
+    public void ReadSingleBigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x43, 0xD2, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x43, 0xD2, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const float expected = 420.0f;
-        float actual = stream.ReadSingle(Endianness.BigEndian);
+        float actual = stream.ReadSingleBigEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    public void ReadSingle_ShouldReadLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadSingleLittleEndian_ShouldReadLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0xD2, 0x43};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0xD2, 0x43 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const float expected = 420.0f;
-        float actual = stream.ReadSingle(Endianness.LittleEndian);
+        float actual = stream.ReadSingleLittleEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt16.cs

@@ -1,72 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt16_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt16_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadUInt16BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt16BigEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadUInt16LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt16((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt16LittleEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt16_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt16BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt16BigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt16LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt16LittleEndian());
+    }
+
+    [Test]
+    public void ReadUInt16BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const ushort expected = 420;
-        ushort actual = stream.ReadUInt16(Endianness.BigEndian);
+        ushort actual = stream.ReadUInt16BigEndian();
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt16_ShouldReadLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadUInt16LittleEndian_ShouldReadLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const ushort expected = 420;
-        ushort actual = stream.ReadUInt16(Endianness.LittleEndian);
+        ushort actual = stream.ReadUInt16LittleEndian();
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt32.cs

@@ -1,72 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt32_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt32_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadUInt32BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt32BigEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadUInt32LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt32((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt32LittleEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt32_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt32BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt32BigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt32LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt32LittleEndian());
+    }
+
+    [Test]
+    public void ReadUInt32BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const uint expected = 420;
-        uint actual = stream.ReadUInt32(Endianness.BigEndian);
+        uint actual = stream.ReadUInt32BigEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt32_ShouldReadLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadUInt32LittleEndian_ShouldReadLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const uint expected = 420;
-        uint actual = stream.ReadUInt32(Endianness.LittleEndian);
+        uint actual = stream.ReadUInt32LittleEndian();
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt64.cs

@@ -1,72 +1,68 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt64_ShouldThrowArgumentException_GivenNonReadableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64(Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt64_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void ReadUInt64BigEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt64BigEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    public void ReadUInt64LittleEndian_ShouldThrowArgumentNullException_GivenNullStream()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt64((Endianness)(-1)));
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt64LittleEndian());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt64_ShouldReadBigEndian_GivenBigEndian()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt64BigEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt64BigEndian());
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void ReadUInt64LittleEndian_ShouldThrowArgumentException_GivenNonReadableStream()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt64LittleEndian());
+    }
+
+    [Test]
+    public void ReadUInt64BigEndian_ShouldReadBigEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const ulong expected = 420;
-        ulong actual = stream.ReadUInt64(Endianness.BigEndian);
+        ulong actual = stream.ReadUInt64BigEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void ReadUInt64_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void ReadUInt64LittleEndian_ShouldWriteLittleEndian()
     {
         using var stream = new MemoryStream();
-        ReadOnlySpan<byte> bytes = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> bytes = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
         stream.Write(bytes);
         stream.Position = 0;
 
         const ulong expected = 420;
-        ulong actual = stream.ReadUInt64(Endianness.LittleEndian);
+        ulong actual = stream.ReadUInt64LittleEndian();
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.WriteDecimal.cs

@@ -1,65 +1,67 @@
 using System.Diagnostics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteDecimal_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0m, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0m, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteDecimal_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndDecimalArgument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0m, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0m, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420.0m));
     }
 
-    [TestMethod]
-    public void WriteDecimal_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndDecimalArgument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420.0m));
     }
 
-    [TestMethod]
-    public void WriteDecimal_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndDecimalArgument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420.0m));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndDecimalArgument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420.0m));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenDecimalArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0m, Endianness.BigEndian);
-        Assert.AreEqual(16, stream.Position);
+        stream.WriteBigEndian(420.0m);
+        Assert.That(stream.Position, Is.EqualTo(16));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[16];
         ReadOnlySpan<byte> expected = stackalloc byte[]
         {
-            0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x68
+            0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x68, 0x10, 0x00, 0x00
         };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(16, read);
+        Assert.That(read, Is.EqualTo(16));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteDecimal_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenDecimalArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0m, Endianness.LittleEndian);
-        Assert.AreEqual(16, stream.Position);
+        stream.WriteLittleEndian(420.0m);
+        Assert.That(stream.Position, Is.EqualTo(16));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[16];
@@ -71,7 +73,7 @@ public partial class StreamTests
 
         Trace.WriteLine(string.Join(", ", actual.ToArray().Select(b => $"0x{b:X2}")));
 
-        Assert.AreEqual(16, read);
+        Assert.That(read, Is.EqualTo(16));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteDouble.cs

@@ -1,68 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteDouble_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteDouble_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndDoubleArgument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420.0));
     }
 
-    [TestMethod]
-    public void WriteDouble_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndDoubleArgument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420.0));
     }
 
-    [TestMethod]
-    public void WriteDouble_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndDoubleArgument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420.0));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndDoubleArgument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420.0));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenDoubleArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteBigEndian(420.0);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x40, 0x7A, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x40, 0x7A, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteDouble_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenDoubleArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteLittleEndian(420.0);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt16.cs

@@ -1,68 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteInt16_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((short)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((short)420, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteInt16_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt16Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((short)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((short)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian((short)420));
     }
 
-    [TestMethod]
-    public void WriteInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt16Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian((short)420));
     }
 
-    [TestMethod]
-    public void WriteInt16_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt16Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian((short)420));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt16Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian((short)420));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenInt16Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write((short)420, Endianness.BigEndian);
-        Assert.AreEqual(2, stream.Position);
+        stream.WriteBigEndian((short)420);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteInt16_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenInt16Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write((short)420, Endianness.LittleEndian);
-        Assert.AreEqual(2, stream.Position);
+        stream.WriteLittleEndian((short)420);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt32.cs

@@ -1,68 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteInt32_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteInt32_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt32Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420));
     }
 
-    [TestMethod]
-    public void WriteInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt32Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420));
     }
 
-    [TestMethod]
-    public void WriteInt32_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt32Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt32Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenInt32Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteBigEndian(420);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteInt32_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenInt32Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteLittleEndian(420);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt64.cs

@@ -1,68 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteInt64_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420L, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420L, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteInt64_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt64Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420L, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420L, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420L));
     }
 
-    [TestMethod]
-    public void WriteInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt64Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420L));
     }
 
-    [TestMethod]
-    public void WriteInt64_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndInt64Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420L));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndInt64Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420L));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenInt64Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420L, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteBigEndian(420L);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteInt64_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
-        stream.Write(420L, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteLittleEndian(420L);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteSingle.cs

@@ -1,68 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    public void WriteSingle_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0f, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0f, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    public void WriteSingle_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndSingleArgument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0f, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0f, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420.0f));
     }
 
-    [TestMethod]
-    public void WriteSingle_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndSingleArgument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420.0f));
     }
 
-    [TestMethod]
-    public void WriteSingle_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndSingleArgument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420.0f));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndSingleArgument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420.0f));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenSingleArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0f, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteBigEndian(420.0f);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x43, 0xD2, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x43, 0xD2, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    public void WriteSingle_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenSingleArgument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420.0f, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteLittleEndian(420.0f);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0xD2, 0x43};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0xD2, 0x43 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt16.cs

@@ -1,73 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt16_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((ushort)420, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt16_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt16Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian((ushort)420));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt16Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian((ushort)420));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt16_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt16Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian((ushort)420));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt16Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian((ushort)420));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenUInt16Endian()
     {
         using var stream = new MemoryStream();
-        stream.Write((ushort)420, Endianness.BigEndian);
-        Assert.AreEqual(2, stream.Position);
+        stream.WriteBigEndian((ushort)420);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt16_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenUInt16tleEndian()
     {
         using var stream = new MemoryStream();
-        stream.Write((ushort)420, Endianness.LittleEndian);
-        Assert.AreEqual(2, stream.Position);
+        stream.WriteLittleEndian((ushort)420);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt32.cs

@@ -1,73 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt32_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420U, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420U, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt32_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt32Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420U, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420U, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420U));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt32Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420U));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt32_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt32Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420U));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt32Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420U));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenUInt32Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420U, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteBigEndian(420U);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt32_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenUInt32Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420U, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        stream.WriteLittleEndian(420U);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt64.cs

@@ -1,73 +1,70 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-public partial class StreamTests
+internal partial class StreamTests
 {
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt64_ShouldThrowArgumentException_GivenNonWriteableStream()
-    {
-        Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420UL, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420UL, Endianness.BigEndian));
-    }
-
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt64_ShouldThrowArgumentNullException_GivenNullStream()
+    [Test]
+    public void WriteBigEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt64Argument()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420UL, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420UL, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.WriteBigEndian(420UL));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteBigEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt64Argument()
     {
-        // we don't need to enclose this stream in a using declaration, since disposing a
-        // null stream is meaningless. NullStream.Dispose actually does nothing, anyway.
-        // that - coupled with the fact that encapsulating the stream in a using declaration causes the
-        // analyser to trip up and think the stream is disposed by the time the local is captured in
-        // assertion lambda - means this line is fine as it is. please do not change.
-        Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteBigEndian(420UL));
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt64_ShouldWriteBigEndian_GivenBigEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldThrowArgumentNullException_GivenNullStream_AndUInt64Argument()
+    {
+        Stream stream = null!;
+        Assert.Throws<ArgumentNullException>(() => stream.WriteLittleEndian(420UL));
+    }
+
+    [Test]
+    [SuppressMessage("Reliability", "CA2000:Dispose objects before losing scope")]
+    public void WriteLittleEndian_ShouldThrowArgumentException_GivenNonWritableStream_AndUInt64Argument()
+    {
+        Stream stream = new DummyStream();
+        Assert.Throws<ArgumentException>(() => stream.WriteLittleEndian(420UL));
+    }
+
+    [Test]
+    public void WriteBigEndian_ShouldWriteBigEndian_GivenUInt64Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420UL, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteBigEndian(420UL);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
-    [CLSCompliant(false)]
-    public void WriteUInt64_ShouldWriteLittleEndian_GivenLittleEndian()
+    [Test]
+    public void WriteLittleEndian_ShouldWriteLittleEndian_GivenUInt64Argument()
     {
         using var stream = new MemoryStream();
-        stream.Write(420UL, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        stream.WriteLittleEndian(420UL);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
-        ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        ReadOnlySpan<byte> expected = stackalloc byte[] { 0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.cs

@@ -1,15 +1,15 @@
 using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public partial class StreamTests
+[TestFixture]
+internal partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void GetHashSha1ShouldBeCorrect()
     {
         // SHA-1
@@ -29,15 +29,15 @@ public partial class StreamTests
         CollectionAssert.AreEqual(expectedHash, hash);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashNullShouldThrow()
     {
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<ArgumentNullException>(() => ((Stream?)null)!.GetHash<SHA1>());
-        Assert.ThrowsException<ArgumentNullException>(() => ((Stream?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<ArgumentNullException>(() => ((Stream?)null)!.GetHash<SHA1>());
+        Assert.Throws<ArgumentNullException>(() => ((Stream?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteHashSha1_ShouldBeCorrect()
     {
         // SHA-1
@@ -53,49 +53,48 @@ public partial class StreamTests
 
         Span<byte> hash = stackalloc byte[20];
         stream.TryWriteHash<SHA1>(hash, out int bytesWritten);
-        Assert.AreEqual(expectedHash.Length, bytesWritten);
+        Assert.That(bytesWritten, Is.EqualTo(expectedHash.Length));
         CollectionAssert.AreEqual(expectedHash, hash.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void GetHash_TryWriteHash_ShouldThrow_GivenNonReadableStream()
     {
-        Assert.ThrowsException<IOException>(() =>
+        Assert.Throws<IOException>(() =>
         {
             using var stream = new DummyStream();
             stream.GetHash<SHA1>();
         });
 
-        Assert.ThrowsException<IOException>(() =>
+        Assert.Throws<IOException>(() =>
         {
             using var stream = new DummyStream();
             stream.TryWriteHash<SHA1>(Span<byte>.Empty, out _);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void LargeStreamShouldThrow()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             using var stream = new DummyStream(true);
             stream.TryWriteHash<SHA1>(Span<byte>.Empty, out _);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NullCreateMethodShouldThrow()
     {
-        Assert.ThrowsException<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClass>());
-        Assert.ThrowsException<TypeInitializationException>(() =>
-            Stream.Null.TryWriteHash<HashAlgorithmTestClass>(Span<byte>.Empty, out _));
+        Assert.Throws<ArgumentException>(() => Stream.Null.GetHash<HashAlgorithmTestClass>());
+        Assert.Throws<ArgumentException>(() => Stream.Null.TryWriteHash<HashAlgorithmTestClass>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void NoCreateMethodShouldThrow()
     {
-        Assert.ThrowsException<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClassNoCreateMethod>());
-        Assert.ThrowsException<TypeInitializationException>(() =>
+        Assert.Throws<ArgumentException>(() => Stream.Null.GetHash<HashAlgorithmTestClassNoCreateMethod>());
+        Assert.Throws<ArgumentException>(() =>
             Stream.Null.TryWriteHash<HashAlgorithmTestClassNoCreateMethod>(Span<byte>.Empty, out _));
     }
 

X10D.Tests/src/IO/TextReaderTests.cs

@@ -1,13 +1,13 @@
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
-public class TextReaderTests
+[TestFixture]
+internal class TextReaderTests
 {
-    [TestMethod]
+    [Test]
     public void EnumerateLines_ShouldYield10Lines_Given10LineString()
     {
         using var stream = new MemoryStream();
@@ -28,10 +28,10 @@ public class TextReaderTests
             lineCount++;
         }
 
-        Assert.AreEqual(10, lineCount);
+        Assert.That(lineCount, Is.EqualTo(10));
     }
 
-    [TestMethod]
+    [Test]
     public async Task EnumerateLinesAsync_ShouldYield10Lines_Given10LineString()
     {
         using var stream = new MemoryStream();
@@ -52,14 +52,14 @@ public class TextReaderTests
             lineCount++;
         }
 
-        Assert.AreEqual(10, lineCount);
+        Assert.That(lineCount, Is.EqualTo(10));
     }
 
-    [TestMethod]
+    [Test]
     public void EnumerateLines_ShouldThrowArgumentNullException_GivenNullSource()
     {
         TextReader reader = null!;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             foreach (string _ in reader.EnumerateLines())
             {
@@ -68,16 +68,16 @@ public class TextReaderTests
         });
     }
 
-    [TestMethod]
-    public async Task EnumerateLinesAsync_ShouldThrowArgumentNullException_GivenNullSource()
+    [Test]
+    public void EnumerateLinesAsync_ShouldThrowArgumentNullException_GivenNullSource()
     {
         TextReader reader = null!;
-        await Assert.ThrowsExceptionAsync<ArgumentNullException>(async () =>
+        Assert.ThrowsAsync<ArgumentNullException>(async () =>
         {
             await foreach (string _ in reader.EnumerateLinesAsync().ConfigureAwait(false))
             {
                 // loop body is intentionally empty
             }
-        }).ConfigureAwait(false);
+        });
     }
 }

X10D.Tests/src/IO/TextWriterTests.Double.cs

@@ -0,0 +1,131 @@
+using System.Globalization;
+using System.Text;
+using NUnit.Framework;
+using X10D.IO;
+
+namespace X10D.Tests.IO;
+
+internal partial class TextWriterTests
+{
+    [Test]
+    public void WriteNoAlloc_ShouldThrowArgumentNullException_GivenDouble_AndNullWriter()
+    {
+        TextWriter writer = null!;
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420.0));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420.0, "N0"));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420.0, "N0", null));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldThrowObjectDisposedException_GivenDouble_AndDisposedStream()
+    {
+        var stream = new MemoryStream();
+        var writer = new StreamWriter(stream, Encoding.UTF8);
+        writer.Dispose();
+        stream.Dispose();
+
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420.0));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420.0, "N0"));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420.0, "N0", null));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldThrowArgumentNullException_GivenDouble_AndNullWriter()
+    {
+        TextWriter writer = null!;
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420.0));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420.0, "N0"));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420.0, "N0", null));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldThrowObjectDisposedException_GivenDouble_AndDisposedStream()
+    {
+        var stream = new MemoryStream();
+        var writer = new StreamWriter(stream, Encoding.UTF8);
+        writer.Dispose();
+        stream.Dispose();
+
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420.0));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420.0, "N0"));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420.0, "N0", null));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenDouble()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420.0);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenDouble_AndFormatString()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420.0, "N0");
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenDouble_AndFormatString_AndCultureInfo()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420.0, "N0", CultureInfo.CurrentCulture);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenDouble()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420.0);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenDouble_AndFormatString()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420.0, "N0");
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenDouble_AndFormatString_AndCultureInfo()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420.0, "N0", CultureInfo.CurrentCulture);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+}

X10D.Tests/src/IO/TextWriterTests.Int32.cs

@@ -0,0 +1,131 @@
+using System.Globalization;
+using System.Text;
+using NUnit.Framework;
+using X10D.IO;
+
+namespace X10D.Tests.IO;
+
+internal partial class TextWriterTests
+{
+    [Test]
+    public void WriteNoAlloc_ShouldThrowArgumentNullException_GivenInt32_AndNullWriter()
+    {
+        TextWriter writer = null!;
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420, "N0"));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteNoAlloc(420, "N0", null));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldThrowObjectDisposedException_GivenInt32_AndDisposedStream()
+    {
+        var stream = new MemoryStream();
+        var writer = new StreamWriter(stream, Encoding.UTF8);
+        writer.Dispose();
+        stream.Dispose();
+
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420, "N0"));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteNoAlloc(420, "N0", null));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldThrowArgumentNullException_GivenInt32_AndNullWriter()
+    {
+        TextWriter writer = null!;
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420, "N0"));
+        Assert.Throws<ArgumentNullException>(() => writer.WriteLineNoAlloc(420, "N0", null));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldThrowObjectDisposedException_GivenInt32_AndDisposedStream()
+    {
+        var stream = new MemoryStream();
+        var writer = new StreamWriter(stream, Encoding.UTF8);
+        writer.Dispose();
+        stream.Dispose();
+
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420, "N0"));
+        Assert.Throws<ObjectDisposedException>(() => writer.WriteLineNoAlloc(420, "N0", null));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenInt32()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenInt32_AndFormatString()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420, "N0");
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteNoAlloc_ShouldWriteTextValue_GivenInt32_AndFormatString_AndCultureInfo()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteNoAlloc(420, "N0", CultureInfo.CurrentCulture);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        const string expected = "420";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenInt32()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenInt32_AndFormatString()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420, "N0");
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+
+    [Test]
+    public void WriteLineNoAlloc_ShouldWriteTextValue_GivenInt32_AndFormatString_AndCultureInfo()
+    {
+        Assert.That(_stream.Length, Is.Zero);
+        _writer.WriteLineNoAlloc(420, "N0", CultureInfo.CurrentCulture);
+        _writer.Flush();
+
+        string actual = Encoding.UTF8.GetString(_stream.ToArray());
+        var expected = $"420{Environment.NewLine}";
+
+        Assert.That(actual, Is.EqualTo(expected));
+    }
+}