Merge pull request #58 from oliverbooth/develop

3.1.0
2024-11-10 00:05:42 +00:00 · 2022-05-13 09:45:58 +01:00 · 2022-05-13 09:45:58 +01:00 · b0ac965a7d
commit b0ac965a7d
parent 5d7d570749 aa00f122b1
184 changed files with 8811 additions and 155 deletions
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@ -32,6 +32,7 @@ jobs:
      run: |
        mkdir build
        dotnet pack X10D -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}
+        dotnet pack X10D.Unity -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='nightly' -p:BuildNumber=${{ github.run_number }}

    - name: Push NuGet Package to GitHub
      run: dotnet nuget push "build/*" --source "github" --api-key ${{ secrets.GITHUB_TOKEN }} --skip-duplicate
--- a/.github/workflows/prerelease.yml
+++ b/.github/workflows/prerelease.yml
@ -32,6 +32,7 @@ jobs:
      run: |
        mkdir build
        dotnet pack X10D -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}
+        dotnet pack X10D.Unity -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build -p:VersionSuffix='prerelease' -p:BuildNumber=${{ github.run_number }}

    - name: Push NuGet Package to GitHub
      run: dotnet nuget push "build/*" --source "github" --api-key ${{ secrets.GITHUB_TOKEN }} --skip-duplicate
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -32,6 +32,7 @@ jobs:
      run: |
        mkdir build
        dotnet pack X10D -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build
+        dotnet pack X10D.Unity -p:SymbolPackageFormat=snupkg --include-symbols --include-source -o build

    - name: Push NuGet Package to GitHub
      run: dotnet nuget push "build/*" --source "github" --api-key ${{ secrets.GITHUB_TOKEN }} --skip-duplicate
--- a/.github/workflows/source_validator.yml
+++ b/.github/workflows/source_validator.yml
@ -32,5 +32,4 @@ jobs:
      run: dotnet build -c Debug

    - name: Run Source Validation
-      run: dotnet run --project X10D.SourceValidator ./X10D/src
-
+      run: dotnet run --project X10D.SourceValidator ./X10D/src ./X10D.Unity/src
--- a/.github/workflows/unity.yml
+++ b/.github/workflows/unity.yml
@ -0,0 +1,50 @@
+name: Unity Test Runner
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+  pull_request:
+    branches:
+      - main
+      - develop
+
+jobs:
+  build:
+    name: "Unity Test Runner"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v2
+        with:
+          dotnet-version: 6.0.x
+
+      - name: Add GitHub NuGet source
+        run: dotnet nuget add source --username oliverbooth --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/oliverbooth/index.json"
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build -c Release
+
+      - name: Copy artifacts to project
+        run: |
+          mkdir -p ./X10D.Unity.Tests/Assets/Libraries
+          cp -r ./X10D/bin/Release/netstandard2.1/X10D.dll ./X10D.Unity.Tests/Assets/Libraries/X10D.dll
+          cp -r ./X10D.Unity/bin/Release/netstandard2.1/X10D.Unity.dll ./X10D.Unity.Tests/Assets/Libraries/X10D.Unity.dll
+
+      - name: Unity - Test runner
+        uses: game-ci/unity-test-runner@v2.0.2
+        env:
+          UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
+          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
+          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+        with:
+          projectPath: X10D.Unity.Tests
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -1,5 +1,80 @@
 # Changelog

+## [3.1.0]
+### Added
+- Reintroduced Unity support
+- X10D: Added `Color.Inverted()` (#54)
+- X10D: Added `Color.WithA()` (#55)
+- X10D: Added `Color.WithB()` (#55)
+- X10D: Added `Color.WithG()` (#55)
+- X10D: Added `Color.WithR()` (#55)
+- X10D: Added `ICollection<T>.ClearAndDisposeAll()`
+- X10D: Added `ICollection<T>.ClearAndDisposeAllAsync()`
+- X10D: Added `IEnumerable<T>.For()` (#50)
+- X10D: Added `IEnumerable<T>.ForEach()` (#50)
+- X10D: Added `IEnumerable<T>.DisposeAll()`
+- X10D: Added `IEnumerable<T>.DisposeAllAsync()`
+- X10D: Added `char.IsEmoji`
+- X10D: Added `ReadOnlySpan<T>.Count(Predicate<T>)`
+- X10D: Added `Rune.IsEmoji`
+- X10D: Added `Span<T>.Count(Predicate<T>)`
+- X10D: Added `string.IsEmoji`
+- X10D: Added `Vector2.WithX()` (#56)
+- X10D: Added `Vector2.WithY()` (#56)
+- X10D: Added `Vector3.WithX()` (#56)
+- X10D: Added `Vector3.WithY()` (#56)
+- X10D: Added `Vector3.WithZ()` (#56)
+- X10D: Added `Vector4.WithX()` (#56)
+- X10D: Added `Vector4.WithY()` (#56)
+- X10D: Added `Vector4.WithZ()` (#56)
+- X10D: Added `Vector4.WithW()` (#56)
+- X10D.Unity: Added `Singleton<T>` class
+- X10D.Unity: Added `Color.Inverted()` (#54)
+- X10D.Unity: Added `Color.WithA()` (#55)
+- X10D.Unity: Added `Color.WithB()` (#55)
+- X10D.Unity: Added `Color.WithG()` (#55)
+- X10D.Unity: Added `Color.WithR()` (#55)
+- X10D.Unity: Added `Color32.Inverted()` (#54)
+- X10D.Unity: Added `Color32.WithA()` (#55)
+- X10D.Unity: Added `Color32.WithB()` (#55)
+- X10D.Unity: Added `Color32.WithG()` (#55)
+- X10D.Unity: Added `Color32.WithR()` (#55)
+- X10D.Unity: Added `Component.GetComponentsInChildrenOnly<T>()`
+- X10D.Unity: Added `GameObject.GetComponentsInChildrenOnly<T>()`
+- X10D.Unity: Added `GameObject.LookAt(GameObject[, Vector3])`
+- X10D.Unity: Added `GameObject.LookAt(Transform[, Vector3])`
+- X10D.Unity: Added `GameObject.LookAt(Vector3[, Vector3])`
+- X10D.Unity: Added `GameObject.SetLayerRecursively(int)` (#57)
+- X10D.Unity: Added `GameObject.SetParent(GameObject[, bool])`
+- X10D.Unity: Added `GameObject.SetParent(Transform[, bool])`
+- X10D.Unity: Added `System.Numerics.Quaternion.ToUnityQuaternion()`
+- X10D.Unity: Added `Quaternion.ToSystemQuaternion()`
+- X10D.Unity: Added `Random.NextColorArgb()`
+- X10D.Unity: Added `Random.NextColor32Argb()`
+- X10D.Unity: Added `Random.NextColorRgb()`
+- X10D.Unity: Added `Random.NextColor32Rgb()`
+- X10D.Unity: Added `Random.NextRotation()`
+- X10D.Unity: Added `Random.NextRotationUniform()`
+- X10D.Unity: Added `Random.NextUnitVector2()`
+- X10D.Unity: Added `Random.NextUnitVector3()`
+- X10D.Unity: Added `Transform.LookAt(GameObject[, Vector3])`
+- X10D.Unity: Added `Transform.SetParent(GameObject[, bool])`
+- X10D.Unity: Added `System.Numerics.Vector2.ToUnityVector()`
+- X10D.Unity: Added `System.Numerics.Vector3.ToUnityVector()`
+- X10D.Unity: Added `System.Numerics.Vector4.ToUnityVector()`
+- X10D.Unity: Added `Vector2.ToSystemVector()`
+- X10D.Unity: Added `Vector3.ToSystemVector()`
+- X10D.Unity: Added `Vector4.ToSystemVector()`
+- X10D.Unity: Added `Vector2.WithX()` (#56)
+- X10D.Unity: Added `Vector2.WithY()` (#56)
+- X10D.Unity: Added `Vector3.WithX()` (#56)
+- X10D.Unity: Added `Vector3.WithY()` (#56)
+- X10D.Unity: Added `Vector3.WithZ()` (#56)
+- X10D.Unity: Added `Vector4.WithX()` (#56)
+- X10D.Unity: Added `Vector4.WithY()` (#56)
+- X10D.Unity: Added `Vector4.WithZ()` (#56)
+- X10D.Unity: Added `Vector4.WithW()` (#56)
+
 ## [3.0.0]

 In the midst of writing these release notes, I may have missed some important changes. If you notice an API change that is not documented here,
@ -299,6 +374,7 @@ please [open an issue](https://github.com/oliverbooth/X10D/issues)!

 ### ***Not documented***

+[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
 [2.6.0]: https://github.com/oliverbooth/X10D/releases/tag/2.6.0
 [2.5.0]: https://github.com/oliverbooth/X10D/releases/tag/2.5.0
--- a/README.md
+++ b/README.md
@ -23,12 +23,12 @@ Install-Package X10D -Version 3.0.0
 ### Manual installation
 Download the [latest release](https://github.com/oliverbooth/X10D/releases/latest) from this repository and adding a direct assembly reference for your chosen platform.

-### What happened to X10D.Unity?
-I decided it was time for X10D to be migrated to .NET 6. Unity currently supports .NET Framework 4.x / .NET Standard 2.1, and as such is not compatible with X10D at this time.
-Unity have announced official support for .NET 6 in the future (see [this forum post](https://forum.unity.com/threads/unity-future-net-development-status.1092205/) for more details),
-but until such a time that Unity supports .NET 6, X10D.Unity will not be maintained or innovated upon.
+### Unity installation
+Starting with Unity 2021.2, support for .NET Standard 2.1 has been added. With this change, I am confident providing support for this version for the time being, with only minimal feature-loss.
+To add X10D into your Unity project, goto the [Package Manager window](https://docs.unity3d.com/Manual/upm-ui.html), and choose to install from a Git URL, and use the URL https://github.com/oliverbooth/X10D.git#upm

-The upm branch, however, is still available under version 2.6.0 - if you wish to use this version, add the package https://github.com/oliverbooth/X10D.git#upm to your Unity project.
+Parity with the main branch of X10D, and full .NET 6 feature support, is planned - but a timeline is not yet available. Unity plan to add .NET 6 support in the near future.
+For more information, see [this forum post](https://forum.unity.com/threads/unity-future-net-development-status.1092205/).

 ## Features
 I'm planning on writing complete and extensive documentation in the near future. As of this time, feel free to browse the source or the API using your favourite IDE.
--- a/X10D.SourceGenerator/EmojiRegexGenerator.cs
+++ b/X10D.SourceGenerator/EmojiRegexGenerator.cs
@ -0,0 +1,68 @@
+using System.Text;
+using System.Text.RegularExpressions;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+namespace X10D.SourceGenerator;
+
+[Generator]
+internal sealed class EmojiRegexGenerator : ISourceGenerator
+{
+    // ReSharper disable once IdentifierTypo
+    private const string TwemojiRegexUrl = "https://raw.githubusercontent.com/twitter/twemoji-parser/master/src/lib/regex.js";
+    private static readonly HttpClient HttpClient = new();
+    private string _emojiRegex = string.Empty;
+
+    /// <inheritdoc />
+    public void Initialize(GeneratorInitializationContext context)
+    {
+        string response = HttpClient.GetStringAsync(TwemojiRegexUrl).GetAwaiter().GetResult();
+        using var reader = new StringReader(response);
+
+        while (reader.ReadLine() is { } line)
+        {
+            if (!line.StartsWith("export default /"))
+            {
+                continue;
+            }
+
+            Match match = Regex.Match(line, @"export default /(?<regex>.+)/g;");
+            if (!match.Success)
+            {
+                continue;
+            }
+
+            _emojiRegex = $"^{match.Groups["regex"].Value}$";
+            break;
+        }
+    }
+
+    /// <inheritdoc />
+    public void Execute(GeneratorExecutionContext context)
+    {
+        if (string.IsNullOrEmpty(_emojiRegex))
+        {
+            return;
+        }
+
+        var builder = new StringBuilder();
+        builder.AppendLine("// This file was auto-generated by X10D.SourceGenerator");
+        builder.AppendLine("// Do not edit this file manually");
+        builder.AppendLine();
+
+        builder.AppendLine("using System.Text.RegularExpressions;");
+        builder.AppendLine();
+        builder.AppendLine("namespace X10D.Text;");
+        builder.AppendLine();
+        builder.AppendLine("internal static class EmojiRegex");
+        builder.AppendLine("{");
+        builder.AppendLine("    internal static readonly Regex Value = new Regex(");
+        builder.AppendLine($"        @\"{_emojiRegex}\",");
+        // ReSharper disable once StringLiteralTypo
+        builder.AppendLine("        RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.Singleline");
+        builder.AppendLine("    );");
+        builder.AppendLine("}");
+
+        context.AddSource("EmojiRegex.g.cs", SourceText.From(builder.ToString(), Encoding.UTF8));
+    }
+}
--- a/X10D.SourceGenerator/X10D.SourceGenerator.csproj
+++ b/X10D.SourceGenerator/X10D.SourceGenerator.csproj
@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netstandard2.0</TargetFramework>
+        <LangVersion>10.0</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all"/>
+        <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3">
+            <PrivateAssets>all</PrivateAssets>
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
+    </ItemGroup>
+
+</Project>
--- a/X10D.SourceValidator/Program.cs
+++ b/X10D.SourceValidator/Program.cs
@ -1,11 +1,13 @@
 using System.Text;

-var directories = new Stack<string>(Directory.GetDirectories(args[0]));
 var problems = 0;
-var files = 0;
-
-while (directories.Count > 0)
+foreach (string arg in args)
 {
+    var directories = new Stack<string>(Directory.GetDirectories(arg));
+    var files = 0;
+
+    while (directories.Count > 0)
+    {
        string path = Path.GetFullPath(directories.Pop());

        foreach (string directory in Directory.EnumerateDirectories(path))
@ -58,7 +60,9 @@ while (directories.Count > 0)
                lineNumber++;
            }
        }
+    }
+
+    Console.Out.WriteLine($"Finished scanning {files} files, {problems} problems encountered.");
 }

-Console.Out.WriteLine($"Finished scanning {files} files, {problems} problems encountered.");
 return problems;
--- a/X10D.Tests/X10D.Tests.csproj
+++ b/X10D.Tests/X10D.Tests.csproj
@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFrameworks>netstandard2.1;net6.0</TargetFrameworks>
+        <LangVersion>10.0</LangVersion>
        <IsPackable>false</IsPackable>
        <Nullable>enable</Nullable>
        <ImplicitUsings>true</ImplicitUsings>
--- a/X10D.Tests/src/Collections/ArrayTests.cs
+++ b/X10D.Tests/src/Collections/ArrayTests.cs
@ -25,6 +25,7 @@ public class ArrayTests
        Assert.ThrowsException<ArgumentNullException>(array!.AsReadOnly);
    }

+    [CLSCompliant(false)]
    [TestMethod]
    [DataRow]
    [DataRow(1)]
--- a/X10D.Tests/src/Collections/CollectionTests.cs
+++ b/X10D.Tests/src/Collections/CollectionTests.cs
@ -0,0 +1,77 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Collections;
+
+namespace X10D.Tests.Collections;
+
+[TestClass]
+public class CollectionTests
+{
+    [TestMethod]
+    public void ClearAndDisposeAll_ShouldDispose_GivenCollection()
+    {
+        var collection = new List<Disposable> {new(), new(), new()};
+        var copy = new List<Disposable>(collection);
+
+        collection.ClearAndDisposeAll();
+
+        Assert.IsTrue(copy.All(x => x.IsDisposed));
+        Assert.AreEqual(0, collection.Count);
+    }
+
+    [TestMethod]
+    public async Task ClearAndDisposeAllAsync_ShouldDispose_GivenCollection()
+    {
+        var collection = new List<Disposable> {new(), new(), new()};
+        var copy = new List<Disposable>(collection);
+
+        await collection.ClearAndDisposeAllAsync();
+
+        Assert.IsTrue(copy.All(x => x.IsDisposed));
+        Assert.AreEqual(0, collection.Count);
+    }
+
+    [TestMethod]
+    public void ClearAndDisposeAll_ShouldThrow_GivenNull()
+    {
+        List<Disposable>? collection = null;
+        Assert.ThrowsException<ArgumentNullException>(() => collection!.ClearAndDisposeAll());
+    }
+
+    [TestMethod]
+    public void ClearAndDisposeAllAsync_ShouldThrow_GivenNull()
+    {
+        List<Disposable>? collection = null;
+        Assert.ThrowsExceptionAsync<ArgumentNullException>(async () => await collection!.ClearAndDisposeAllAsync());
+    }
+
+    [TestMethod]
+    public void ClearAndDisposeAll_ShouldThrow_GivenReadOnlyCollection()
+    {
+        var collection = new List<Disposable>().AsReadOnly();
+        Assert.ThrowsException<InvalidOperationException>(() => collection.ClearAndDisposeAll());
+    }
+
+    [TestMethod]
+    public void ClearAndDisposeAllAsync_ShouldThrow_GivenReadOnlyCollection()
+    {
+        var collection = new List<Disposable>().AsReadOnly();
+        Assert.ThrowsExceptionAsync<InvalidOperationException>(async () => await collection.ClearAndDisposeAllAsync());
+    }
+
+    private class Disposable : IDisposable, IAsyncDisposable
+    {
+        public bool IsDisposed { get; private set; }
+
+        public void Dispose()
+        {
+            Assert.IsTrue(IsDisposed = true);
+        }
+
+#pragma warning disable CS1998
+        public async ValueTask DisposeAsync()
+#pragma warning restore CS1998
+        {
+            Assert.IsTrue(IsDisposed = true);
+        }
+    }
+}
--- a/X10D.Tests/src/Collections/EnumerableTests.cs
+++ b/X10D.Tests/src/Collections/EnumerableTests.cs
@ -6,6 +6,94 @@ namespace X10D.Tests.Collections;
 [TestClass]
 public class EnumerableTests
 {
+    [TestMethod]
+    public void DisposeAll_ShouldDispose_GivenCollection()
+    {
+        var collection = new List<Disposable> {new(), new(), new()};
+        collection.DisposeAll();
+        Assert.IsTrue(collection.All(x => x.IsDisposed));
+    }
+
+    [TestMethod]
+    public async Task DisposeAllAsync_ShouldDispose_GivenCollection()
+    {
+        var collection = new List<Disposable> {new(), new(), new()};
+        await collection.DisposeAllAsync();
+        Assert.IsTrue(collection.All(x => x.IsDisposed));
+    }
+
+    [TestMethod]
+    public void DisposeAll_ShouldThrow_GivenNull()
+    {
+        List<Disposable>? collection = null;
+        Assert.ThrowsException<ArgumentNullException>(() => collection!.DisposeAll());
+    }
+
+    [TestMethod]
+    public async Task DisposeAllAsync_ShouldThrow_GivenNull()
+    {
+        List<Disposable>? collection = null;
+        await Assert.ThrowsExceptionAsync<ArgumentNullException>(async () => await collection!.DisposeAllAsync());
+    }
+
+    [TestMethod]
+    public void For_ShouldTransform_GivenTransformationDelegate()
+    {
+        var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        var multipliedByIndex = new[] {0, 2, 6, 12, 20, 30, 42, 56, 72, 90};
+
+        IEnumerable<DummyClass> source = oneToTen.Select(i => new DummyClass {Value = i}).ToArray();
+        IEnumerable<int> values = source.Select(o => o.Value);
+        CollectionAssert.AreEqual(oneToTen, values.ToArray());
+
+        source.For((i, o) => o.Value *= i);
+        values = source.Select(o => o.Value);
+        CollectionAssert.AreEqual(multipliedByIndex, values.ToArray());
+    }
+
+    [TestMethod]
+    public void For_ShouldThrow_GivenNullSource()
+    {
+        IEnumerable<object>? source = null;
+        Assert.ThrowsException<ArgumentNullException>(() => source!.For((_, _) => { }));
+    }
+
+    [TestMethod]
+    public void For_ShouldThrow_GivenNullAction()
+    {
+        IEnumerable<object> source = ArraySegment<object>.Empty;
+        Assert.ThrowsException<ArgumentNullException>(() => source.For(null!));
+    }
+
+    [TestMethod]
+    public void ForEach_ShouldTransform_GivenTransformationDelegate()
+    {
+        var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        var oneToTenDoubled = new[] {2, 4, 6, 8, 10, 12, 14, 16, 18, 20};
+
+        IEnumerable<DummyClass> source = oneToTen.Select(i => new DummyClass {Value = i}).ToArray();
+        IEnumerable<int> values = source.Select(o => o.Value);
+        CollectionAssert.AreEqual(oneToTen, values.ToArray());
+
+        source.ForEach(o => o.Value *= 2);
+        values = source.Select(o => o.Value);
+        CollectionAssert.AreEqual(oneToTenDoubled, values.ToArray());
+    }
+
+    [TestMethod]
+    public void ForEach_ShouldThrow_GivenNullSource()
+    {
+        IEnumerable<object>? source = null;
+        Assert.ThrowsException<ArgumentNullException>(() => source!.ForEach(_ => { }));
+    }
+
+    [TestMethod]
+    public void ForEach_ShouldThrow_GivenNullAction()
+    {
+        IEnumerable<object> source = ArraySegment<object>.Empty;
+        Assert.ThrowsException<ArgumentNullException>(() => source.ForEach(null!));
+    }
+
    [TestMethod]
    public void Shuffled_ShouldThrow_GivenNull()
    {
@ -23,4 +111,26 @@ public class EnumerableTests
        shuffled = array.Shuffled().ToArray();
        CollectionAssert.AreNotEqual(array, shuffled);
    }
+
+    private class DummyClass
+    {
+        public int Value { get; set; }
+    }
+
+    private class Disposable : IDisposable, IAsyncDisposable
+    {
+        public bool IsDisposed { get; private set; }
+
+        public void Dispose()
+        {
+            Assert.IsTrue(IsDisposed = true);
+        }
+
+#pragma warning disable CS1998
+        public async ValueTask DisposeAsync()
+#pragma warning restore CS1998
+        {
+            Assert.IsTrue(IsDisposed = true);
+        }
+    }
 }
--- a/X10D.Tests/src/Collections/ListTests.cs
+++ b/X10D.Tests/src/Collections/ListTests.cs
@ -6,6 +6,7 @@ namespace X10D.Tests.Collections;
 [TestClass]
 public class ListTests
 {
+    [CLSCompliant(false)]
    [TestMethod]
    [DataRow(1)]
    [DataRow(1, 2, 3)]
@ -25,6 +26,7 @@ public class ListTests
        CollectionAssert.AreEqual(all42, list);
    }

+    [CLSCompliant(false)]
    [TestMethod]
    [DataRow(1)]
    [DataRow(1, 2, 3)]
--- a/X10D.Tests/src/Core/EnumerableTests.cs
+++ b/X10D.Tests/src/Core/EnumerableTests.cs
@ -1,20 +0,0 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using X10D.Core;
-
-namespace X10D.Tests.Core;
-
-[TestClass]
-public class EnumerableTests
-{
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
-    public void AsEnumerable_ShouldWrapElement_GivenValue(object o)
-    {
-        IEnumerable<object?> array = o.AsEnumerableValue().ToArray(); // prevent multiple enumeration of IEnumerable
-        Assert.IsNotNull(array);
-        Assert.IsTrue(array.Count() == 1);
-        Assert.AreEqual(o, array.ElementAt(0));
-    }
-}
--- a/X10D.Tests/src/Drawing/ColorTests.cs
+++ b/X10D.Tests/src/Drawing/ColorTests.cs
@ -0,0 +1,69 @@
+using System.Drawing;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Drawing;
+
+namespace X10D.Tests.Drawing;
+
+[TestClass]
+public class ColorTests
+{
+    private static readonly Color Black = Color.FromArgb(0, 0, 0);
+    private static readonly Color White = Color.FromArgb(255, 255, 255);
+    private static readonly Color Red = Color.FromArgb(255, 0, 0);
+    private static readonly Color Green = Color.FromArgb(0, 255, 0);
+    private static readonly Color Blue = Color.FromArgb(0, 0, 255);
+    private static readonly Color Cyan = Color.FromArgb(0, 255, 255);
+    private static readonly Color Magenta = Color.FromArgb(255, 0, 255);
+    private static readonly Color Yellow = Color.FromArgb(255, 255, 0);
+
+    [TestMethod]
+    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());
+    }
+
+    [TestMethod]
+    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);
+    }
+
+    [TestMethod]
+    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));
+    }
+
+    [TestMethod]
+    public void WithB0_ShouldReturnYellow_GivenWhite()
+    {
+        Assert.AreEqual(Yellow, White.WithB(0));
+        Assert.AreEqual(Yellow, Yellow.WithB(0));
+    }
+
+    [TestMethod]
+    public void WithG0_ShouldReturnMagenta_GivenWhite()
+    {
+        Assert.AreEqual(Magenta, White.WithG(0));
+        Assert.AreEqual(Magenta, Magenta.WithG(0));
+    }
+
+    [TestMethod]
+    public void WithR0_ShouldReturnCyan_GivenWhite()
+    {
+        Assert.AreEqual(Cyan, White.WithR(0));
+        Assert.AreEqual(Cyan, Cyan.WithR(0));
+    }
+}
--- a/X10D.Tests/src/Linq/ReadOnlySpanTests.cs
+++ b/X10D.Tests/src/Linq/ReadOnlySpanTests.cs
@ -55,4 +55,28 @@ public class ReadOnlySpanTests
            return span.Any(null!);
        });
    }
+
+    [TestMethod]
+    public void Count_ShouldReturn0_GivenEmptySpan()
+    {
+        var span = new ReadOnlySpan<int>();
+        Assert.AreEqual(0, span.Count(i => i % 2 == 0));
+    }
+
+    [TestMethod]
+    public void Count_ShouldReturn5_ForEvenNumbers_GivenNumbers1To10()
+    {
+        var span = new ReadOnlySpan<int>(new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
+        Assert.AreEqual(5, span.Count(i => i % 2 == 0));
+    }
+
+    [TestMethod]
+    public void Count_ShouldThrow_GivenNullPredicate()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new ReadOnlySpan<int>();
+            return span.Count(null!);
+        });
+    }
 }
--- a/X10D.Tests/src/Linq/SByteExtensions.cs
+++ b/X10D.Tests/src/Linq/SByteExtensions.cs
@ -12,12 +12,12 @@ public class SByteTests
    {
        sbyte Cast(int i) => (sbyte)i;

-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Product());
+        Assert.AreEqual(0, Enumerable.Range(0, 10).Select(Cast).Product());
+        Assert.AreEqual(1, Enumerable.Range(1, 1).Select(Cast).Product());
+        Assert.AreEqual(2, Enumerable.Range(1, 2).Select(Cast).Product());
+        Assert.AreEqual(6, Enumerable.Range(1, 3).Select(Cast).Product());
+        Assert.AreEqual(24, Enumerable.Range(1, 4).Select(Cast).Product());
+        Assert.AreEqual(120, Enumerable.Range(1, 5).Select(Cast).Product());

        // 6! will overflow for sbyte
    }
--- a/X10D.Tests/src/Linq/SpanTests.cs
+++ b/X10D.Tests/src/Linq/SpanTests.cs
@ -55,4 +55,28 @@ public class SpanTests
            return span.Any(null!);
        });
    }
+
+    [TestMethod]
+    public void Count_ShouldReturn0_GivenEmptySpan()
+    {
+        var span = new Span<int>();
+        Assert.AreEqual(0, span.Count(i => i % 2 == 0));
+    }
+
+    [TestMethod]
+    public void Count_ShouldReturn5_ForEvenNumbers_GivenNumbers1To10()
+    {
+        var span = new Span<int>(new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
+        Assert.AreEqual(5, span.Count(i => i % 2 == 0));
+    }
+
+    [TestMethod]
+    public void Count_ShouldThrow_GivenNullPredicate()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new Span<int>();
+            return span.Count(null!);
+        });
+    }
 }
--- a/X10D.Tests/src/Math/DecimalTests.cs
+++ b/X10D.Tests/src/Math/DecimalTests.cs
@ -7,6 +7,7 @@ namespace X10D.Tests.Math;
 [TestClass]
 public class DecimalTests
 {
+#if NETCOREAPP3_0_OR_GREATER
    [TestMethod]
    public void ComplexSqrt_ShouldBeCorrect_GivenReal()
    {
@ -25,6 +26,7 @@ public class DecimalTests
        Assert.AreEqual(new Complex(0, 3.0), (-9.0m).ComplexSqrt());
        Assert.AreEqual(new Complex(0, 4.0), (-16.0m).ComplexSqrt());
    }
+#endif

    [TestMethod]
    public void IsEven_ShouldBeFalse_GivenOddNumber()
--- a/X10D.Tests/src/Math/DoubleTests.cs
+++ b/X10D.Tests/src/Math/DoubleTests.cs
@ -29,6 +29,7 @@ public class DoubleTests
        Assert.AreEqual(12.0, 0.20943951023931953.RadiansToDegrees(), 1e-6);
    }

+#if NETCOREAPP3_0_OR_GREATER
    [TestMethod]
    public void ComplexSqrt_ShouldBeCorrect_GivenReal()
    {
@ -60,6 +61,7 @@ public class DoubleTests
    {
        Assert.AreEqual(Complex.NaN, double.NaN.ComplexSqrt());
    }
+#endif

    [TestMethod]
    public void IsEven_ShouldBeFalse_GivenOddNumber()
--- a/X10D.Tests/src/Math/SingleTests.cs
+++ b/X10D.Tests/src/Math/SingleTests.cs
@ -29,6 +29,7 @@ public class SingleTests
        Assert.AreEqual(12.0f, 0.20943952f.RadiansToDegrees(), 1e-6f);
    }

+#if NETCOREAPP3_0_OR_GREATER
    [TestMethod]
    public void ComplexSqrt_ShouldBeCorrect_GivenReal()
    {
@ -60,6 +61,7 @@ public class SingleTests
    {
        Assert.AreEqual(Complex.NaN, float.NaN.ComplexSqrt());
    }
+#endif

    [TestMethod]
    public void IsEven_ShouldBeFalse_GivenOddNumber()
--- a/X10D.Tests/src/Numerics/Vector2Tests.cs
+++ b/X10D.Tests/src/Numerics/Vector2Tests.cs
@ -0,0 +1,37 @@
+using System.Numerics;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Numerics;
+
+namespace X10D.Tests.Numerics;
+
+[TestClass]
+public class Vector2Tests
+{
+    [TestMethod]
+    public void WithX_ShouldReturnVectorWithNewX_GivenVector()
+    {
+        Assert.AreEqual(Vector2.UnitY, Vector2.One.WithX(0));
+        Assert.AreEqual(Vector2.Zero, Vector2.Zero.WithX(0));
+        Assert.AreEqual(Vector2.Zero, Vector2.UnitX.WithX(0));
+        Assert.AreEqual(Vector2.UnitY, Vector2.UnitY.WithX(0));
+
+        Assert.AreEqual(Vector2.One, Vector2.One.WithX(1));
+        Assert.AreEqual(Vector2.UnitX, Vector2.Zero.WithX(1));
+        Assert.AreEqual(Vector2.UnitX, Vector2.UnitX.WithX(1));
+        Assert.AreEqual(Vector2.One, Vector2.UnitY.WithX(1));
+    }
+
+    [TestMethod]
+    public void WithY_ShouldReturnVectorWithNewY_GivenVector()
+    {
+        Assert.AreEqual(Vector2.UnitX, Vector2.One.WithY(0));
+        Assert.AreEqual(Vector2.Zero, Vector2.Zero.WithY(0));
+        Assert.AreEqual(Vector2.UnitX, Vector2.UnitX.WithY(0));
+        Assert.AreEqual(Vector2.Zero, Vector2.UnitY.WithY(0));
+
+        Assert.AreEqual(Vector2.One, Vector2.One.WithY(1));
+        Assert.AreEqual(Vector2.UnitY, Vector2.Zero.WithY(1));
+        Assert.AreEqual(Vector2.One, Vector2.UnitX.WithY(1));
+        Assert.AreEqual(Vector2.UnitY, Vector2.UnitY.WithY(1));
+    }
+}
--- a/X10D.Tests/src/Numerics/Vector3Tests.cs
+++ b/X10D.Tests/src/Numerics/Vector3Tests.cs
@ -0,0 +1,57 @@
+using System.Numerics;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Numerics;
+
+namespace X10D.Tests.Numerics;
+
+[TestClass]
+public class Vector3Tests
+{
+    [TestMethod]
+    public void WithX_ShouldReturnVectorWithNewX_GivenVector()
+    {
+        Assert.AreEqual(new Vector3(0, 1, 1), Vector3.One.WithX(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.Zero.WithX(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.UnitX.WithX(0));
+        Assert.AreEqual(Vector3.UnitY, Vector3.UnitY.WithX(0));
+        Assert.AreEqual(Vector3.UnitZ, Vector3.UnitZ.WithX(0));
+
+        Assert.AreEqual(Vector3.One, Vector3.One.WithX(1));
+        Assert.AreEqual(Vector3.UnitX, Vector3.Zero.WithX(1));
+        Assert.AreEqual(Vector3.UnitX, Vector3.UnitX.WithX(1));
+        Assert.AreEqual(new Vector3(1, 1, 0), Vector3.UnitY.WithX(1));
+        Assert.AreEqual(new Vector3(1, 0, 1), Vector3.UnitZ.WithX(1));
+    }
+
+    [TestMethod]
+    public void WithY_ShouldReturnVectorWithNewY_GivenVector()
+    {
+        Assert.AreEqual(new Vector3(1, 0, 1), Vector3.One.WithY(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.Zero.WithY(0));
+        Assert.AreEqual(Vector3.UnitX, Vector3.UnitX.WithY(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.UnitY.WithY(0));
+        Assert.AreEqual(Vector3.UnitZ, Vector3.UnitZ.WithY(0));
+
+        Assert.AreEqual(Vector3.One, Vector3.One.WithY(1));
+        Assert.AreEqual(Vector3.UnitY, Vector3.Zero.WithY(1));
+        Assert.AreEqual(new Vector3(1, 1, 0), Vector3.UnitX.WithY(1));
+        Assert.AreEqual(Vector3.UnitY, Vector3.UnitY.WithY(1));
+        Assert.AreEqual(new Vector3(0, 1, 1), Vector3.UnitZ.WithY(1));
+    }
+
+    [TestMethod]
+    public void WithZ_ShouldReturnVectorWithNewZ_GivenVector()
+    {
+        Assert.AreEqual(new Vector3(1, 1, 0), Vector3.One.WithZ(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.Zero.WithZ(0));
+        Assert.AreEqual(Vector3.UnitX, Vector3.UnitX.WithZ(0));
+        Assert.AreEqual(Vector3.UnitY, Vector3.UnitY.WithZ(0));
+        Assert.AreEqual(Vector3.Zero, Vector3.UnitZ.WithZ(0));
+
+        Assert.AreEqual(Vector3.One, Vector3.One.WithZ(1));
+        Assert.AreEqual(Vector3.UnitZ, Vector3.Zero.WithZ(1));
+        Assert.AreEqual(new Vector3(1, 0, 1), Vector3.UnitX.WithZ(1));
+        Assert.AreEqual(new Vector3(0, 1, 1), Vector3.UnitY.WithZ(1));
+        Assert.AreEqual(Vector3.UnitZ, Vector3.UnitZ.WithZ(1));
+    }
+}
--- a/X10D.Tests/src/Numerics/Vector4Tests.cs
+++ b/X10D.Tests/src/Numerics/Vector4Tests.cs
@ -0,0 +1,81 @@
+using System.Numerics;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Numerics;
+
+namespace X10D.Tests.Numerics;
+
+[TestClass]
+public class Vector4Tests
+{
+    [TestMethod]
+    public void WithW_ShouldReturnVectorWithNewW_GivenVector()
+    {
+        Assert.AreEqual(new Vector4(1, 1, 1, 0), Vector4.One.WithW(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.Zero.WithW(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.UnitW.WithW(0));
+        Assert.AreEqual(Vector4.UnitX, Vector4.UnitX.WithW(0));
+        Assert.AreEqual(Vector4.UnitY, Vector4.UnitY.WithW(0));
+        Assert.AreEqual(Vector4.UnitZ, Vector4.UnitZ.WithW(0));
+
+        Assert.AreEqual(Vector4.One, Vector4.One.WithW(1));
+        Assert.AreEqual(Vector4.UnitW, Vector4.Zero.WithW(1));
+        Assert.AreEqual(Vector4.UnitW, Vector4.UnitW.WithW(1));
+        Assert.AreEqual(new Vector4(1, 0, 0, 1), Vector4.UnitX.WithW(1));
+        Assert.AreEqual(new Vector4(0, 1, 0, 1), Vector4.UnitY.WithW(1));
+        Assert.AreEqual(new Vector4(0, 0, 1, 1), Vector4.UnitZ.WithW(1));
+    }
+
+    [TestMethod]
+    public void WithX_ShouldReturnVectorWithNewX_GivenVector()
+    {
+        Assert.AreEqual(new Vector4(0, 1, 1, 1), Vector4.One.WithX(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.Zero.WithX(0));
+        Assert.AreEqual(Vector4.UnitW, Vector4.UnitW.WithX(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.UnitX.WithX(0));
+        Assert.AreEqual(Vector4.UnitY, Vector4.UnitY.WithX(0));
+        Assert.AreEqual(Vector4.UnitZ, Vector4.UnitZ.WithX(0));
+
+        Assert.AreEqual(Vector4.One, Vector4.One.WithX(1));
+        Assert.AreEqual(Vector4.UnitX, Vector4.Zero.WithX(1));
+        Assert.AreEqual(new Vector4(1, 0, 0, 1), Vector4.UnitW.WithX(1));
+        Assert.AreEqual(Vector4.UnitX, Vector4.UnitX.WithX(1));
+        Assert.AreEqual(new Vector4(1, 1, 0, 0), Vector4.UnitY.WithX(1));
+        Assert.AreEqual(new Vector4(1, 0, 1, 0), Vector4.UnitZ.WithX(1));
+    }
+
+    [TestMethod]
+    public void WithY_ShouldReturnVectorWithNewY_GivenVector()
+    {
+        Assert.AreEqual(new Vector4(1, 0, 1, 1), Vector4.One.WithY(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.Zero.WithY(0));
+        Assert.AreEqual(Vector4.UnitW, Vector4.UnitW.WithY(0));
+        Assert.AreEqual(Vector4.UnitX, Vector4.UnitX.WithY(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.UnitY.WithY(0));
+        Assert.AreEqual(Vector4.UnitZ, Vector4.UnitZ.WithY(0));
+
+        Assert.AreEqual(Vector4.One, Vector4.One.WithY(1));
+        Assert.AreEqual(Vector4.UnitY, Vector4.Zero.WithY(1));
+        Assert.AreEqual(new Vector4(0, 1, 0, 1), Vector4.UnitW.WithY(1));
+        Assert.AreEqual(new Vector4(1, 1, 0, 0), Vector4.UnitX.WithY(1));
+        Assert.AreEqual(Vector4.UnitY, Vector4.UnitY.WithY(1));
+        Assert.AreEqual(new Vector4(0, 1, 1, 0), Vector4.UnitZ.WithY(1));
+    }
+
+    [TestMethod]
+    public void WithZ_ShouldReturnVectorWithNewZ_GivenVector()
+    {
+        Assert.AreEqual(new Vector4(1, 1, 0, 1), Vector4.One.WithZ(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.Zero.WithZ(0));
+        Assert.AreEqual(Vector4.UnitW, Vector4.UnitW.WithZ(0));
+        Assert.AreEqual(Vector4.UnitX, Vector4.UnitX.WithZ(0));
+        Assert.AreEqual(Vector4.UnitY, Vector4.UnitY.WithZ(0));
+        Assert.AreEqual(Vector4.Zero, Vector4.UnitZ.WithZ(0));
+
+        Assert.AreEqual(Vector4.One, Vector4.One.WithZ(1));
+        Assert.AreEqual(Vector4.UnitZ, Vector4.Zero.WithZ(1));
+        Assert.AreEqual(new Vector4(0, 0, 1, 1), Vector4.UnitW.WithZ(1));
+        Assert.AreEqual(new Vector4(1, 0, 1, 0), Vector4.UnitX.WithZ(1));
+        Assert.AreEqual(new Vector4(0, 1, 1, 0), Vector4.UnitY.WithZ(1));
+        Assert.AreEqual(Vector4.UnitZ, Vector4.UnitZ.WithZ(1));
+    }
+}
--- a/X10D.Tests/src/Text/CharTests.cs
+++ b/X10D.Tests/src/Text/CharTests.cs
@ -1,4 +1,5 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Text;

 namespace X10D.Tests.Text;
@ -6,6 +7,25 @@ namespace X10D.Tests.Text;
 [TestClass]
 public class CharTests
 {
+    [TestMethod]
+    public void IsEmoji_ShouldReturnTrue_GivenBasicEmoji()
+    {
+        Assert.IsTrue('✂'.IsEmoji());
+        Assert.IsTrue('✅'.IsEmoji());
+        Assert.IsTrue('❎'.IsEmoji());
+        Assert.IsTrue('➕'.IsEmoji());
+        Assert.IsTrue('➖'.IsEmoji());
+    }
+
+    [TestMethod]
+    public void IsEmoji_ShouldReturnFalse_GivenNonEmoji()
+    {
+        for (var letter = 'A'; letter <= 'Z'; letter++)
+        {
+            Assert.IsFalse(letter.IsEmoji());
+        }
+    }
+
    [TestMethod]
    public void RepeatShouldBeCorrect()
    {
--- a/X10D.Tests/src/Text/CoreTests.cs
+++ b/X10D.Tests/src/Text/CoreTests.cs
@ -6,6 +6,7 @@ namespace X10D.Tests.Text;
 [TestClass]
 public class CoreTests
 {
+#if NET5_0_OR_GREATER
    [TestMethod]
    public void ToJsonShouldNotBeEmpty()
    {
@ -23,4 +24,5 @@ public class CoreTests
        CollectionAssert.AreEqual(source, target);
        CollectionAssert.AreEquivalent(source, target);
    }
+#endif
 }
--- a/X10D.Tests/src/Text/RuneTests.cs
+++ b/X10D.Tests/src/Text/RuneTests.cs
@ -1,4 +1,5 @@
-using System.Text;
+#if NETCOREAPP3_0_OR_GREATER
+using System.Text;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Text;

@ -7,6 +8,25 @@ namespace X10D.Tests.Text;
 [TestClass]
 public class RuneTests
 {
+    [TestMethod]
+    public void IsEmoji_ShouldReturnTrue_GivenBasicEmoji()
+    {
+        Assert.IsTrue(new Rune('✂').IsEmoji());
+        Assert.IsTrue(new Rune('✅').IsEmoji());
+        Assert.IsTrue(new Rune('❎').IsEmoji());
+        Assert.IsTrue(new Rune('➕').IsEmoji());
+        Assert.IsTrue(new Rune('➖').IsEmoji());
+    }
+
+    [TestMethod]
+    public void IsEmoji_ShouldReturnFalse_GivenNonEmoji()
+    {
+        for (var letter = 'A'; letter <= 'Z'; letter++)
+        {
+            Assert.IsFalse(new Rune(letter).IsEmoji());
+        }
+    }
+
    [TestMethod]
    public void RepeatShouldBeCorrect()
    {
@ -37,3 +57,4 @@ public class RuneTests
        Assert.ThrowsException<ArgumentOutOfRangeException>(() => new Rune('a').Repeat(-1));
    }
 }
+#endif
--- a/X10D.Tests/src/Text/StringTests.cs
+++ b/X10D.Tests/src/Text/StringTests.cs
@ -1,5 +1,7 @@
 using System.Text;
+#if NET5_0_OR_GREATER
 using System.Text.Json.Serialization;
+#endif
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Text;

@ -149,6 +151,7 @@ public class StringTests
        Assert.ThrowsException<ArgumentException>(() => " ".EnumParse<DayOfWeek>());
    }

+#if NET5_0_OR_GREATER
    [TestMethod]
    public void FromJson_ShouldDeserializeCorrectly_GivenJsonString()
    {
@ -162,6 +165,7 @@ public class StringTests
        Assert.AreEqual(2, target.Values[1]);
        Assert.AreEqual(3, target.Values[2]);
    }
+#endif

    [TestMethod]
    public void GetBytes_ShouldReturnUtf8Bytes_GivenHelloWorld()
@ -195,6 +199,44 @@ public class StringTests
        Assert.ThrowsException<ArgumentNullException>(() => "Hello World".GetBytes(null!));
    }

+    [TestMethod]
+    public void IsEmoji_ShouldReturnTrue_GivenBasicEmoji()
+    {
+        Assert.IsTrue("😀".IsEmoji());
+        Assert.IsTrue("🤓".IsEmoji());
+        Assert.IsTrue("🟦".IsEmoji());
+        Assert.IsTrue("🟧".IsEmoji());
+        Assert.IsTrue("🟨".IsEmoji());
+        Assert.IsTrue("🟩".IsEmoji());
+        Assert.IsTrue("🟪".IsEmoji());
+        Assert.IsTrue("🟫".IsEmoji());
+        Assert.IsTrue("📱".IsEmoji());
+        Assert.IsTrue("🎨".IsEmoji());
+    }
+
+    [TestMethod]
+    public void IsEmoji_ShouldReturnTrue_GivenMultiByteEmoji()
+    {
+        string[] regionalIndicatorCodes = Enumerable.Range(0, 26)
+            .Select(i => Encoding.Unicode.GetString(new byte[] {0x3C, 0xD8, (byte)(0xE6 + i), 0xDD}))
+            .ToArray();
+
+        for (var i = 0; i < 26; i++)
+        for (var j = 0; j < 26; j++)
+        {
+            string flag = (regionalIndicatorCodes[i] + regionalIndicatorCodes[j]);
+            Assert.IsTrue(flag.IsEmoji());
+        }
+    }
+
+    [TestMethod]
+    public void IsEmoji_ShouldReturnFalse_GivenNonEmoji()
+    {
+        Assert.IsFalse("Hello World".IsEmoji());
+        Assert.IsFalse("Hello".IsEmoji());
+        Assert.IsFalse("World".IsEmoji());
+    }
+
    [TestMethod]
    public void IsLower_ShouldReturnTrue_GivenLowercaseString()
    {
@ -441,9 +483,11 @@ public class StringTests
        Assert.AreEqual(alternative, ((string?)null).WithWhiteSpaceAlternative(alternative));
    }

+#if NET5_0_OR_GREATER
    private struct SampleStructure
    {
        [JsonPropertyName("values")]
        public int[] Values { get; set; }
    }
+#endif
 }
--- a/X10D.Tests/src/Time/DoubleTests.cs
+++ b/X10D.Tests/src/Time/DoubleTests.cs
@ -1,4 +1,5 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+#if NET5_0_OR_GREATER
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Time;

 namespace X10D.Tests.Time;
@ -51,3 +52,4 @@ public class DoubleTests
        Assert.IsTrue((_negativeOne).Weeks() < TimeSpan.Zero);
    }
 }
+#endif
--- a/X10D.Unity.Tests/.gitignore
+++ b/X10D.Unity.Tests/.gitignore
@ -0,0 +1,72 @@
+# This .gitignore file should be placed at the root of your Unity project directory
+#
+# Get latest from https://github.com/github/gitignore/blob/main/Unity.gitignore
+#
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/[Ll]ogs/
+/[Uu]ser[Ss]ettings/
+
+# MemoryCaptures can get excessive in size.
+# They also could contain extremely sensitive data
+/[Mm]emoryCaptures/
+
+# Recordings can get excessive in size
+/[Rr]ecordings/
+
+# Uncomment this line if you wish to ignore the asset store tools plugin
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+
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+
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+*.pidb
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+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# Unity3D generated meta files
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+*.pdb.meta
+*.mdb.meta
+
+# Unity3D generated file on crash reports
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+
+# Builds
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+*.app
+
+# Crashlytics generated file
+crashlytics-build.properties
+
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--- a/X10D.Unity.Tests/Assets/Scenes/SampleScene.unity.meta
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--- a/X10D.Unity.Tests/Assets/Tests.meta
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--- a/X10D.Unity.Tests/Assets/Tests/ComponentTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/ComponentTests.cs
@ -0,0 +1,29 @@
+#nullable enable
+
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace X10D.Unity.Tests
+{
+    public class ComponentTests
+    {
+        [UnityTest]
+        public IEnumerator GetComponentsInChildrenOnly_ShouldIgnoreParent()
+        {
+            var parent = new GameObject();
+            var rigidbody = parent.AddComponent<Rigidbody>();
+
+            var child = new GameObject();
+            child.transform.SetParent(parent.transform);
+            child.AddComponent<Rigidbody>();
+
+            Rigidbody[] components = rigidbody.GetComponentsInChildrenOnly<Rigidbody>();
+            Assert.AreEqual(1, components.Length);
+            Assert.AreEqual(components[0].gameObject, child);
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/ComponentTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/ComponentTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0619dbb274114e4aa247ed8f4e7cff03
+timeCreated: 1652006240
--- a/X10D.Unity.Tests/Assets/Tests/Drawing.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 9674f5a2171d4c7d88cbfe9f1249bb27
+timeCreated: 1652006440
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/Color32Tests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/Color32Tests.cs
@ -0,0 +1,83 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Unity.Drawing;
+
+namespace X10D.Unity.Tests.Drawing
+{
+    public class Color32Tests
+    {
+        private static readonly Color32 Black = new(0, 0, 0, 1);
+        private static readonly Color32 White = new(255, 255, 255, 1);
+        private static readonly Color32 Red = new(255, 0, 0, 1);
+        private static readonly Color32 Green = new(0, 255, 0, 1);
+        private static readonly Color32 Blue = new(0, 0, 255, 1);
+        private static readonly Color32 Cyan = new(0, 255, 255, 1);
+        private static readonly Color32 Magenta = new(255, 0, 255, 1);
+        private static readonly Color32 Yellow = new(255, 255, 0, 1);
+
+        [UnityTest]
+        public IEnumerator 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());
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator Inverted_ShouldIgnoreAlpha()
+        {
+            var expected = new Color32(0, 0, 0, 255);
+            var actual = new Color32(255, 255, 255, 255).Inverted();
+
+            Assert.AreEqual(expected, actual);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithA0_ShouldReturnSameColor_GivenWhite()
+        {
+            var transparent = new Color32(255, 255, 255, 0);
+            Assert.AreEqual(transparent, White.WithA(0));
+            Assert.AreEqual(transparent, transparent.WithA(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithB0_ShouldReturnYellow_GivenWhite()
+        {
+            Assert.AreEqual(Yellow, White.WithB(0));
+            Assert.AreEqual(Yellow, Yellow.WithB(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithG0_ShouldReturnMagenta_GivenWhite()
+        {
+            Assert.AreEqual(Magenta, White.WithG(0));
+            Assert.AreEqual(Magenta, Magenta.WithG(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithR0_ShouldReturnCyan_GivenWhite()
+        {
+            Assert.AreEqual(Cyan, White.WithR(0));
+            Assert.AreEqual(Cyan, Cyan.WithR(0));
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/Color32Tests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/Color32Tests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 877c5a68b0dd44c68aae01463ae26b26
+timeCreated: 1652035626
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/ColorTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/ColorTests.cs
@ -0,0 +1,83 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Unity.Drawing;
+
+namespace X10D.Unity.Tests.Drawing
+{
+    public class ColorTests
+    {
+        private static readonly Color Black = new(0, 0, 0);
+        private static readonly Color White = new(1, 1, 1);
+        private static readonly Color Red = new(1, 0, 0);
+        private static readonly Color Green = new(0, 1, 0);
+        private static readonly Color Blue = new(0, 0, 1);
+        private static readonly Color Cyan = new(0, 1, 1);
+        private static readonly Color Magenta = new(1, 0, 1);
+        private static readonly Color Yellow = new(1, 1, 0);
+
+        [UnityTest]
+        public IEnumerator 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());
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator Inverted_ShouldIgnoreAlpha()
+        {
+            var expected = new Color(0, 0, 0, 1);
+            var actual = new Color(1, 1, 1, 1).Inverted();
+
+            Assert.AreEqual(expected, actual);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithA0_ShouldReturnSameColor_GivenWhite()
+        {
+            var transparent = new Color(1, 1, 1, 0);
+            Assert.AreEqual(transparent, White.WithA(0));
+            Assert.AreEqual(transparent, transparent.WithA(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithB0_ShouldReturnYellow_GivenWhite()
+        {
+            Assert.AreEqual(Yellow, White.WithB(0));
+            Assert.AreEqual(Yellow, Yellow.WithB(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithG0_ShouldReturnMagenta_GivenWhite()
+        {
+            Assert.AreEqual(Magenta, White.WithG(0));
+            Assert.AreEqual(Magenta, Magenta.WithG(0));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithR0_ShouldReturnCyan_GivenWhite()
+        {
+            Assert.AreEqual(Cyan, White.WithR(0));
+            Assert.AreEqual(Cyan, Cyan.WithR(0));
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/ColorTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/ColorTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 61df0ae6778a4ab084e688f13adfc29c
+timeCreated: 1652035747
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/RandomTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/RandomTests.cs
@ -0,0 +1,87 @@
+#nullable enable
+
+using System;
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Unity.Drawing;
+using Random = System.Random;
+
+namespace X10D.Unity.Tests.Drawing
+{
+    public class RandomTests
+    {
+        [UnityTest]
+        public IEnumerator NextColorArgb_ShouldReturn331515e5_GivenSeed1234()
+        {
+            var random = new Random(1234);
+            var color = random.NextColorArgb();
+            Assert.AreEqual(0.373868465f, color.r, 1e-6f);
+            Assert.AreEqual(0.391597569f, color.g, 1e-6f);
+            Assert.AreEqual(0.675019085f, color.b, 1e-6f);
+            Assert.AreEqual(0.234300315f, color.a, 1e-6f);
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColorArgb_ShouldThrow_GivenNull()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextColorArgb());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColor32Argb_ShouldReturn331515e5_GivenSeed1234()
+        {
+            var random = new Random(1234);
+            Assert.AreEqual(new Color32(21, 21, 229, 51), random.NextColor32Argb());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColor32Argb_ShouldThrow_GivenNull()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextColor32Argb());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColorRgb_ShouldReturn1515e5_GivenSeed1234()
+        {
+            var random = new Random(1234);
+            var color = random.NextColorRgb();
+            Assert.AreEqual(0.234300315f, color.r, 1e-6f);
+            Assert.AreEqual(0.373868465f, color.g, 1e-6f);
+            Assert.AreEqual(0.391597569f, color.b, 1e-6f);
+            Assert.AreEqual(1, color.a, 1e-6f);
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColorRgb_ShouldThrow_GivenNull()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextColorRgb());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColor32Rgb_ShouldReturn1515e5_GivenSeed1234()
+        {
+            var random = new Random(1234);
+            Assert.AreEqual(new Color32(21, 21, 229, 255), random.NextColor32Rgb());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextColor32Rgb_ShouldThrow_GivenNull()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextColor32Rgb());
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Drawing/RandomTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Drawing/RandomTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 28fa03c101834cd79774d8138b9d4adb
+timeCreated: 1652006445
--- a/X10D.Unity.Tests/Assets/Tests/GameObjectTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/GameObjectTests.cs
@ -0,0 +1,109 @@
+#nullable enable
+
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace X10D.Unity.Tests
+{
+    public class GameObjectTests
+    {
+        [UnityTest]
+        public IEnumerator GetComponentsInChildrenOnly_ShouldIgnoreParent()
+        {
+            var parent = new GameObject();
+            parent.AddComponent<Rigidbody>();
+
+            var child = new GameObject();
+            child.transform.SetParent(parent.transform);
+            child.AddComponent<Rigidbody>();
+
+            Rigidbody[] components = parent.GetComponentsInChildrenOnly<Rigidbody>();
+            Assert.AreEqual(1, components.Length);
+            Assert.AreEqual(components[0].gameObject, child);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator LookAt_ShouldRotateSameAsTransform()
+        {
+            var first = new GameObject {transform = {position = Vector3.zero, rotation = Quaternion.identity}};
+            var second = new GameObject {transform = {position = Vector3.right, rotation = Quaternion.identity}};
+            Transform firstTransform = first.transform;
+            Transform secondTransform = second.transform;
+
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+            Assert.AreEqual(Quaternion.identity, secondTransform.rotation);
+
+            firstTransform.LookAt(secondTransform);
+            Quaternion expected = firstTransform.rotation;
+
+            firstTransform.rotation = Quaternion.identity;
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+
+            first.LookAt(second);
+            Assert.AreEqual(expected, firstTransform.rotation);
+
+            firstTransform.rotation = Quaternion.identity;
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+
+            first.LookAt(second.transform);
+            Assert.AreEqual(expected, firstTransform.rotation);
+
+            firstTransform.rotation = Quaternion.identity;
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+
+            first.LookAt(Vector3.right);
+            Assert.AreEqual(expected, firstTransform.rotation);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator SetLayerRecursively_ShouldSetLayerRecursively()
+        {
+            var parent = new GameObject();
+            var child = new GameObject();
+            var grandChild = new GameObject();
+
+            child.transform.SetParent(parent.transform);
+            grandChild.transform.SetParent(child.transform);
+
+            int layer = LayerMask.NameToLayer("UI");
+            Assert.AreNotEqual(layer, parent.layer);
+            Assert.AreNotEqual(layer, child.layer);
+            Assert.AreNotEqual(layer, grandChild.layer);
+
+            parent.SetLayerRecursively(layer);
+
+            Assert.AreEqual(layer, parent.layer);
+            Assert.AreEqual(layer, child.layer);
+            Assert.AreEqual(layer, grandChild.layer);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator SetParent_ShouldSetParent()
+        {
+            var first = new GameObject {transform = {position = Vector3.zero, rotation = Quaternion.identity}};
+            var second = new GameObject {transform = {position = Vector3.right, rotation = Quaternion.identity}};
+
+            Assert.AreEqual(null, first.transform.parent);
+            Assert.AreEqual(null, second.transform.parent);
+
+            first.SetParent(second);
+            Assert.AreEqual(second.transform, first.transform.parent);
+
+            first.transform.SetParent(null!);
+            Assert.AreEqual(null, first.transform.parent);
+
+            second.SetParent(first);
+            Assert.AreEqual(first.transform, second.transform.parent);
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/GameObjectTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/GameObjectTests.cs.meta
@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 1fde6c311eaec944abe1e4531a2980bc
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/X10D.Unity.Tests/Assets/Tests/Numerics.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c906e39e3c8d44c7a8dafe042fedf677
+timeCreated: 1652006420
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/QuaternionTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/QuaternionTests.cs
@ -0,0 +1,53 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Core;
+using X10D.Unity.Numerics;
+using Random = System.Random;
+
+namespace X10D.Unity.Tests.Numerics
+{
+    public class QuaternionTests
+    {
+        [UnityTest]
+        public IEnumerator ToSystemQuaternion_ShouldReturnQuaternion_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+            float w = random.NextSingle();
+
+            var quaternion = new Quaternion(x, y, z, w);
+            var systemQuaternion = quaternion.ToSystemQuaternion();
+
+            Assert.AreEqual(quaternion.x, systemQuaternion.X, 1e-6f);
+            Assert.AreEqual(quaternion.y, systemQuaternion.Y, 1e-6f);
+            Assert.AreEqual(quaternion.z, systemQuaternion.Z, 1e-6f);
+            Assert.AreEqual(quaternion.w, systemQuaternion.W, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator ToUnityQuaternion_ShouldReturnQuaternion_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+            float w = random.NextSingle();
+
+            var quaternion = new System.Numerics.Quaternion(x, y, z, w);
+            var unityQuaternion = quaternion.ToUnityQuaternion();
+
+            Assert.AreEqual(quaternion.X, unityQuaternion.x, 1e-6f);
+            Assert.AreEqual(quaternion.Y, unityQuaternion.y, 1e-6f);
+            Assert.AreEqual(quaternion.Z, unityQuaternion.z, 1e-6f);
+            Assert.AreEqual(quaternion.W, unityQuaternion.w, 1e-6f);
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/QuaternionTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/QuaternionTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: a395fec41c5a4e9d9ffb05324e8159b0
+timeCreated: 1652124913
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/RandomTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/RandomTests.cs
@ -0,0 +1,63 @@
+#nullable enable
+
+using System;
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine.TestTools;
+using X10D.Unity.Numerics;
+
+namespace X10D.Unity.Tests.Numerics
+{
+    public class RandomTests
+    {
+        [UnityTest]
+        public IEnumerator NextUnitVector2_ShouldReturnVector_WithMagnitude1()
+        {
+            var random = new Random();
+            var vector = random.NextUnitVector2();
+            Assert.AreEqual(1, vector.magnitude, 1e-6);
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextUnitVector2_ShouldThrow_GivenNullRandom()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextUnitVector2());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextUnitVector3_ShouldReturnVector_WithMagnitude1()
+        {
+            var random = new Random();
+            var vector = random.NextUnitVector3();
+            Assert.AreEqual(1, vector.magnitude, 1e-6);
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextUnitVector3_ShouldThrow_GivenNullRandom()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextUnitVector3());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextRotation_ShouldThrow_GivenNullRandom()
+        {
+            Random random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextRotation());
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator NextRotationUniform_ShouldThrow_GivenNullRandom()
+        {
+            Random? random = null;
+            Assert.Throws<ArgumentNullException>(() => random!.NextRotationUniform());
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/RandomTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/RandomTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 74577fe33f85446194c4ae2315caaace
+timeCreated: 1652006301
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector2Tests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector2Tests.cs
@ -0,0 +1,79 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Core;
+using X10D.Unity.Numerics;
+using Random = System.Random;
+
+namespace X10D.Unity.Tests.Numerics
+{
+    public class Vector2Tests
+    {
+        [UnityTest]
+        public IEnumerator ToSystemVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+
+            var vector = new Vector2(x, y);
+            var systemVector = vector.ToSystemVector();
+
+            Assert.AreEqual(vector.magnitude, systemVector.Length(), 1e-6f);
+            Assert.AreEqual(vector.x, systemVector.X, 1e-6f);
+            Assert.AreEqual(vector.y, systemVector.Y, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator ToUnityVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+
+            var vector = new System.Numerics.Vector2(x, y);
+            var unityVector = vector.ToUnityVector();
+
+            Assert.AreEqual(vector.Length(), unityVector.magnitude, 1e-6f);
+            Assert.AreEqual(vector.X, unityVector.x, 1e-6f);
+            Assert.AreEqual(vector.Y, unityVector.y, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithX_ShouldReturnVectorWithNewX_GivenVector()
+        {
+            Assert.AreEqual(Vector2.up, Vector2.one.WithX(0));
+            Assert.AreEqual(Vector2.zero, Vector2.zero.WithX(0));
+            Assert.AreEqual(Vector2.zero, Vector2.right.WithX(0));
+            Assert.AreEqual(Vector2.up, Vector2.up.WithX(0));
+
+            Assert.AreEqual(Vector2.one, Vector2.one.WithX(1));
+            Assert.AreEqual(Vector2.right, Vector2.zero.WithX(1));
+            Assert.AreEqual(Vector2.right, Vector2.right.WithX(1));
+            Assert.AreEqual(Vector2.one, Vector2.up.WithX(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithY_ShouldReturnVectorWithNewY_GivenVector()
+        {
+            Assert.AreEqual(Vector2.right, Vector2.one.WithY(0));
+            Assert.AreEqual(Vector2.zero, Vector2.zero.WithY(0));
+            Assert.AreEqual(Vector2.right, Vector2.right.WithY(0));
+            Assert.AreEqual(Vector2.zero, Vector2.up.WithY(0));
+
+            Assert.AreEqual(Vector2.one, Vector2.one.WithY(1));
+            Assert.AreEqual(Vector2.up, Vector2.zero.WithY(1));
+            Assert.AreEqual(Vector2.one, Vector2.right.WithY(1));
+            Assert.AreEqual(Vector2.up, Vector2.up.WithY(1));
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector2Tests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector2Tests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 83385270996049569380ae9769ff1381
+timeCreated: 1652088132
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector3Tests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector3Tests.cs
@ -0,0 +1,105 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Core;
+using X10D.Unity.Numerics;
+using Random = System.Random;
+
+namespace X10D.Unity.Tests.Numerics
+{
+    public class Vector3Tests
+    {
+        [UnityTest]
+        public IEnumerator ToSystemVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+
+            var vector = new Vector3(x, y, z);
+            var systemVector = vector.ToSystemVector();
+
+            Assert.AreEqual(vector.magnitude, systemVector.Length(), 1e-6f);
+            Assert.AreEqual(vector.x, systemVector.X, 1e-6f);
+            Assert.AreEqual(vector.y, systemVector.Y, 1e-6f);
+            Assert.AreEqual(vector.z, systemVector.Z, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator ToUnityVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+
+            var vector = new System.Numerics.Vector3(x, y, z);
+            var unityVector = vector.ToUnityVector();
+
+            Assert.AreEqual(vector.Length(), unityVector.magnitude, 1e-6f);
+            Assert.AreEqual(vector.X, unityVector.x, 1e-6f);
+            Assert.AreEqual(vector.Y, unityVector.y, 1e-6f);
+            Assert.AreEqual(vector.Z, unityVector.z, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithX_ShouldReturnVectorWithNewX_GivenVector()
+        {
+            Assert.AreEqual(new Vector3(0, 1, 1), Vector3.one.WithX(0));
+            Assert.AreEqual(Vector3.zero, Vector3.zero.WithX(0));
+            Assert.AreEqual(Vector3.zero, Vector3.right.WithX(0));
+            Assert.AreEqual(Vector3.up, Vector3.up.WithX(0));
+            Assert.AreEqual(Vector3.forward, Vector3.forward.WithX(0));
+
+            Assert.AreEqual(Vector3.one, Vector3.one.WithX(1));
+            Assert.AreEqual(Vector3.right, Vector3.zero.WithX(1));
+            Assert.AreEqual(Vector3.right, Vector3.right.WithX(1));
+            Assert.AreEqual(new Vector3(1, 1, 0), Vector3.up.WithX(1));
+            Assert.AreEqual(new Vector3(1, 0, 1), Vector3.forward.WithX(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithY_ShouldReturnVectorWithNewY_GivenVector()
+        {
+            Assert.AreEqual(new Vector3(1, 0, 1), Vector3.one.WithY(0));
+            Assert.AreEqual(Vector3.zero, Vector3.zero.WithY(0));
+            Assert.AreEqual(Vector3.right, Vector3.right.WithY(0));
+            Assert.AreEqual(Vector3.zero, Vector3.up.WithY(0));
+            Assert.AreEqual(Vector3.forward, Vector3.forward.WithY(0));
+
+            Assert.AreEqual(Vector3.one, Vector3.one.WithY(1));
+            Assert.AreEqual(Vector3.up, Vector3.zero.WithY(1));
+            Assert.AreEqual(new Vector3(1, 1, 0), Vector3.right.WithY(1));
+            Assert.AreEqual(Vector3.up, Vector3.up.WithY(1));
+            Assert.AreEqual(new Vector3(0, 1, 1), Vector3.forward.WithY(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithZ_ShouldReturnVectorWithNewZ_GivenVector()
+        {
+            Assert.AreEqual(new Vector3(1, 1, 0), Vector3.one.WithZ(0));
+            Assert.AreEqual(Vector3.zero, Vector3.zero.WithZ(0));
+            Assert.AreEqual(Vector3.right, Vector3.right.WithZ(0));
+            Assert.AreEqual(Vector3.up, Vector3.up.WithZ(0));
+            Assert.AreEqual(Vector3.zero, Vector3.forward.WithZ(0));
+
+            Assert.AreEqual(Vector3.one, Vector3.one.WithZ(1));
+            Assert.AreEqual(Vector3.forward, Vector3.zero.WithZ(1));
+            Assert.AreEqual(new Vector3(1, 0, 1), Vector3.right.WithZ(1));
+            Assert.AreEqual(new Vector3(0, 1, 1), Vector3.up.WithZ(1));
+            Assert.AreEqual(Vector3.forward, Vector3.forward.WithZ(1));
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector3Tests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector3Tests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: a00d613201bd497d91c9e98bca8dd6b1
+timeCreated: 1652088132
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector4Tests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector4Tests.cs
@ -0,0 +1,135 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using X10D.Core;
+using X10D.Unity.Numerics;
+using Random = System.Random;
+
+namespace X10D.Unity.Tests.Numerics
+{
+    public class Vector4Tests
+    {
+        [UnityTest]
+        public IEnumerator ToSystemVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+            float w = random.NextSingle();
+
+            var vector = new Vector4(x, y, z, w);
+            var systemVector = vector.ToSystemVector();
+
+            Assert.AreEqual(vector.magnitude, systemVector.Length(), 1e-6f);
+            Assert.AreEqual(vector.x, systemVector.X, 1e-6f);
+            Assert.AreEqual(vector.y, systemVector.Y, 1e-6f);
+            Assert.AreEqual(vector.z, systemVector.Z, 1e-6f);
+            Assert.AreEqual(vector.w, systemVector.W, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator ToUnityVector_ShouldReturnVector_WithEqualComponents()
+        {
+            var random = new Random();
+            float x = random.NextSingle();
+            float y = random.NextSingle();
+            float z = random.NextSingle();
+            float w = random.NextSingle();
+
+            var vector = new System.Numerics.Vector4(x, y, z, w);
+            var unityVector = vector.ToUnityVector();
+
+            Assert.AreEqual(vector.Length(), unityVector.magnitude, 1e-6f);
+            Assert.AreEqual(vector.X, unityVector.x, 1e-6f);
+            Assert.AreEqual(vector.Y, unityVector.y, 1e-6f);
+            Assert.AreEqual(vector.Z, unityVector.z, 1e-6f);
+            Assert.AreEqual(vector.W, unityVector.w, 1e-6f);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithW_ShouldReturnVectorWithNewW_GivenVector()
+        {
+            Assert.AreEqual(new Vector4(1, 1, 1, 0), Vector4.one.WithW(0));
+            Assert.AreEqual(Vector4.zero, Vector4.zero.WithW(0));
+            Assert.AreEqual(Vector4.zero, new Vector4(0, 0, 0, 1).WithW(0));
+            Assert.AreEqual(new Vector4(1, 0, 0, 0), new Vector4(1, 0, 0, 0).WithW(0));
+            Assert.AreEqual(new Vector4(0, 1, 0, 0), new Vector4(0, 1, 0, 0).WithW(0));
+            Assert.AreEqual(new Vector4(0, 0, 1, 0), new Vector4(0, 0, 1, 0).WithW(0));
+
+            Assert.AreEqual(Vector4.one, Vector4.one.WithW(1));
+            Assert.AreEqual(new Vector4(0, 0, 0, 1), Vector4.zero.WithW(1));
+            Assert.AreEqual(new Vector4(0, 0, 0, 1), new Vector4(0, 0, 0, 1).WithW(1));
+            Assert.AreEqual(new Vector4(1, 0, 0, 1), new Vector4(1, 0, 0, 0).WithW(1));
+            Assert.AreEqual(new Vector4(0, 1, 0, 1), new Vector4(0, 1, 0, 0).WithW(1));
+            Assert.AreEqual(new Vector4(0, 0, 1, 1), new Vector4(0, 0, 1, 0).WithW(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithX_ShouldReturnVectorWithNewX_GivenVector()
+        {
+            Assert.AreEqual(new Vector4(0, 1, 1, 1), Vector4.one.WithX(0));
+            Assert.AreEqual(Vector4.zero, Vector4.zero.WithX(0));
+            Assert.AreEqual(new Vector4(0, 0, 0, 1), new Vector4(0, 0, 0, 1).WithX(0));
+            Assert.AreEqual(Vector4.zero, new Vector4(1, 0, 0, 0).WithX(0));
+            Assert.AreEqual(new Vector4(0, 1, 0, 0), new Vector4(0, 1, 0, 0).WithX(0));
+            Assert.AreEqual(new Vector4(0, 0, 1, 0), new Vector4(0, 0, 1, 0).WithX(0));
+
+            Assert.AreEqual(Vector4.one, Vector4.one.WithX(1));
+            Assert.AreEqual(new Vector4(1, 0, 0, 0), Vector4.zero.WithX(1));
+            Assert.AreEqual(new Vector4(1, 0, 0, 1), new Vector4(0, 0, 0, 1).WithX(1));
+            Assert.AreEqual(new Vector4(1, 0, 0, 0), new Vector4(1, 0, 0, 0).WithX(1));
+            Assert.AreEqual(new Vector4(1, 1, 0, 0), new Vector4(0, 1, 0, 0).WithX(1));
+            Assert.AreEqual(new Vector4(1, 0, 1, 0), new Vector4(0, 0, 1, 0).WithX(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithY_ShouldReturnVectorWithNewY_GivenVector()
+        {
+            Assert.AreEqual(new Vector4(1, 0, 1, 1), Vector4.one.WithY(0));
+            Assert.AreEqual(Vector4.zero, Vector4.zero.WithY(0));
+            Assert.AreEqual(new Vector4(0, 0, 0, 1), new Vector4(0, 0, 0, 1).WithY(0));
+            Assert.AreEqual(new Vector4(1, 0, 0, 0), new Vector4(1, 0, 0, 0).WithY(0));
+            Assert.AreEqual(Vector4.zero, new Vector4(0, 1, 0, 0).WithY(0));
+            Assert.AreEqual(new Vector4(0, 0, 1, 0), new Vector4(0, 0, 1, 0).WithY(0));
+
+            Assert.AreEqual(Vector4.one, Vector4.one.WithY(1));
+            Assert.AreEqual(new Vector4(0, 1, 0, 0), Vector4.zero.WithY(1));
+            Assert.AreEqual(new Vector4(0, 1, 0, 1), new Vector4(0, 0, 0, 1).WithY(1));
+            Assert.AreEqual(new Vector4(1, 1, 0, 0), new Vector4(1, 0, 0, 0).WithY(1));
+            Assert.AreEqual(new Vector4(0, 1, 0, 0), new Vector4(0, 1, 0, 0).WithY(1));
+            Assert.AreEqual(new Vector4(0, 1, 1, 0), new Vector4(0, 0, 1, 0).WithY(1));
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator WithZ_ShouldReturnVectorWithNewZ_GivenVector()
+        {
+            Assert.AreEqual(new Vector4(1, 1, 0, 1), Vector4.one.WithZ(0));
+            Assert.AreEqual(Vector4.zero, Vector4.zero.WithZ(0));
+            Assert.AreEqual(new Vector4(0, 0, 0, 1), new Vector4(0, 0, 0, 1).WithZ(0));
+            Assert.AreEqual(new Vector4(1, 0, 0, 0), new Vector4(1, 0, 0, 0).WithZ(0));
+            Assert.AreEqual(new Vector4(0, 1, 0, 0), new Vector4(0, 1, 0, 0).WithZ(0));
+            Assert.AreEqual(Vector4.zero, new Vector4(0, 0, 1, 0).WithZ(0));
+
+            Assert.AreEqual(Vector4.one, Vector4.one.WithZ(1));
+            Assert.AreEqual(new Vector4(0, 0, 1, 0), Vector4.zero.WithZ(1));
+            Assert.AreEqual(new Vector4(0, 0, 1, 1), new Vector4(0, 0, 0, 1).WithZ(1));
+            Assert.AreEqual(new Vector4(1, 0, 1, 0), new Vector4(1, 0, 0, 0).WithZ(1));
+            Assert.AreEqual(new Vector4(0, 1, 1, 0), new Vector4(0, 1, 0, 0).WithZ(1));
+            Assert.AreEqual(new Vector4(0, 0, 1, 0), new Vector4(0, 0, 1, 0).WithZ(1));
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/Numerics/Vector4Tests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/Numerics/Vector4Tests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0d487c2046a64354b199f4de01d57391
+timeCreated: 1652088132
--- a/X10D.Unity.Tests/Assets/Tests/SingletonTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/SingletonTests.cs
@ -0,0 +1,45 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace X10D.Unity.Tests
+{
+    public class SingletonTests
+    {
+        [UnityTest]
+        public IEnumerator Singleton_ShouldReturnNewInstance_WhenNoInstanceExists()
+        {
+            TestBehaviour instance = Singleton<TestBehaviour>.Instance;
+            Assert.IsTrue(instance);
+            Assert.IsTrue(instance.Flag);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator Singleton_ShouldReturnSameInstance_WhenAccessedTwice()
+        {
+            TestBehaviour instance = Singleton<TestBehaviour>.Instance;
+            Assert.IsTrue(instance);
+            Assert.AreEqual(instance, Singleton<TestBehaviour>.Instance);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator Singleton_ShouldReturnNewInstance_WhenDestroyed()
+        {
+            TestBehaviour instance = Singleton<TestBehaviour>.Instance;
+            Assert.IsTrue(instance);
+            Object.Destroy(instance);
+            yield return null;
+            Assert.IsFalse(instance);
+
+            // ReSharper disable once HeuristicUnreachableCode
+            instance = Singleton<TestBehaviour>.Instance;
+            Assert.IsNotNull(instance);
+            Assert.IsTrue(instance.Flag);
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/SingletonTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/SingletonTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 5c51198d124f40859bd9298d3241d5a6
+timeCreated: 1652428949
--- a/X10D.Unity.Tests/Assets/Tests/TestBehaviour.cs
+++ b/X10D.Unity.Tests/Assets/Tests/TestBehaviour.cs
@ -0,0 +1,10 @@
+namespace X10D.Unity.Tests
+{
+    internal sealed class TestBehaviour : Singleton<TestBehaviour>
+    {
+        public bool Flag
+        {
+            get => true;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/TestBehaviour.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/TestBehaviour.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: df932718d20948ecbe9b0de8aa7bbaf4
+timeCreated: 1652428898
--- a/X10D.Unity.Tests/Assets/Tests/TransformTests.cs
+++ b/X10D.Unity.Tests/Assets/Tests/TransformTests.cs
@ -0,0 +1,59 @@
+#nullable enable
+
+using System.Collections;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace X10D.Unity.Tests
+{
+    public class TransformTests
+    {
+        [UnityTest]
+        public IEnumerator LookAt_ShouldRotateSameAsTransform()
+        {
+            var first = new GameObject {transform = {position = Vector3.zero, rotation = Quaternion.identity}};
+            var second = new GameObject {transform = {position = Vector3.right, rotation = Quaternion.identity}};
+            Transform firstTransform = first.transform;
+            Transform secondTransform = second.transform;
+
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+            Assert.AreEqual(Quaternion.identity, secondTransform.rotation);
+
+            firstTransform.LookAt(secondTransform);
+            Quaternion expected = firstTransform.rotation;
+
+            firstTransform.rotation = Quaternion.identity;
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+
+            firstTransform.LookAt(second);
+            Assert.AreEqual(expected, firstTransform.rotation);
+
+            firstTransform.rotation = Quaternion.identity;
+            Assert.AreEqual(Quaternion.identity, firstTransform.rotation);
+
+            yield break;
+        }
+
+        [UnityTest]
+        public IEnumerator SetParent_ShouldSetParent()
+        {
+            var first = new GameObject {transform = {position = Vector3.zero, rotation = Quaternion.identity}};
+            var second = new GameObject {transform = {position = Vector3.right, rotation = Quaternion.identity}};
+
+            Assert.AreEqual(null, first.transform.parent);
+            Assert.AreEqual(null, second.transform.parent);
+
+            first.transform.SetParent(second);
+            Assert.AreEqual(second.transform, first.transform.parent);
+
+            first.transform.SetParent(null!);
+            Assert.AreEqual(null, first.transform.parent);
+
+            second.transform.SetParent(first);
+            Assert.AreEqual(first.transform, second.transform.parent);
+
+            yield break;
+        }
+    }
+}
--- a/X10D.Unity.Tests/Assets/Tests/TransformTests.cs.meta
+++ b/X10D.Unity.Tests/Assets/Tests/TransformTests.cs.meta
@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1f1518cdf51546288b7a16369297be5e
+timeCreated: 1652005981
--- a/X10D.Unity.Tests/Assets/Tests/X10D.Unity.Tests.asmdef
+++ b/X10D.Unity.Tests/Assets/Tests/X10D.Unity.Tests.asmdef
@ -0,0 +1,23 @@
+{
+    "name": "X10D.Unity.Tests",
+    "rootNamespace": "X10D.Unity",
+    "references": [
+        "UnityEngine.TestRunner",
+        "UnityEditor.TestRunner"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "nunit.framework.dll",
+        "X10D.dll",
+        "X10D.Unity.dll"
+    ],
+    "autoReferenced": false,
+    "defineConstraints": [
+        "UNITY_INCLUDE_TESTS"
+    ],
+    "versionDefines": [],
+    "noEngineReferences": false
+}
--- a/X10D.Unity.Tests/Assets/Tests/X10D.Unity.Tests.asmdef.meta
+++ b/X10D.Unity.Tests/Assets/Tests/X10D.Unity.Tests.asmdef.meta
@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 34215b8a0b1faf64487ff72821603aad
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/X10D.Unity.Tests/Packages/manifest.json
+++ b/X10D.Unity.Tests/Packages/manifest.json
@ -0,0 +1,45 @@
+{
+  "dependencies": {
+    "com.unity.collab-proxy": "1.15.17",
+    "com.unity.feature.development": "1.0.1",
+    "com.unity.ide.rider": "3.0.14",
+    "com.unity.ide.visualstudio": "2.0.15",
+    "com.unity.ide.vscode": "1.2.5",
+    "com.unity.test-framework": "1.1.31",
+    "com.unity.textmeshpro": "3.0.6",
+    "com.unity.timeline": "1.6.4",
+    "com.unity.ugui": "1.0.0",
+    "com.unity.visualscripting": "1.7.7",
+    "com.unity.modules.ai": "1.0.0",
+    "com.unity.modules.androidjni": "1.0.0",
+    "com.unity.modules.animation": "1.0.0",
+    "com.unity.modules.assetbundle": "1.0.0",
+    "com.unity.modules.audio": "1.0.0",
+    "com.unity.modules.cloth": "1.0.0",
+    "com.unity.modules.director": "1.0.0",
+    "com.unity.modules.imageconversion": "1.0.0",
+    "com.unity.modules.imgui": "1.0.0",
+    "com.unity.modules.jsonserialize": "1.0.0",
+    "com.unity.modules.particlesystem": "1.0.0",
+    "com.unity.modules.physics": "1.0.0",
+    "com.unity.modules.physics2d": "1.0.0",
+    "com.unity.modules.screencapture": "1.0.0",
+    "com.unity.modules.terrain": "1.0.0",
+    "com.unity.modules.terrainphysics": "1.0.0",
+    "com.unity.modules.tilemap": "1.0.0",
+    "com.unity.modules.ui": "1.0.0",
+    "com.unity.modules.uielements": "1.0.0",
+    "com.unity.modules.umbra": "1.0.0",
+    "com.unity.modules.unityanalytics": "1.0.0",
+    "com.unity.modules.unitywebrequest": "1.0.0",
+    "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
+    "com.unity.modules.unitywebrequestaudio": "1.0.0",
+    "com.unity.modules.unitywebrequesttexture": "1.0.0",
+    "com.unity.modules.unitywebrequestwww": "1.0.0",
+    "com.unity.modules.vehicles": "1.0.0",
+    "com.unity.modules.video": "1.0.0",
+    "com.unity.modules.vr": "1.0.0",
+    "com.unity.modules.wind": "1.0.0",
+    "com.unity.modules.xr": "1.0.0"
+  }
+}
--- a/X10D.Unity.Tests/Packages/packages-lock.json
+++ b/X10D.Unity.Tests/Packages/packages-lock.json
@ -0,0 +1,413 @@
+{
+  "dependencies": {
+    "com.unity.collab-proxy": {
+      "version": "1.15.17",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.services.core": "1.0.1"
+      },
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.editorcoroutines": {
+      "version": "1.0.0",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.ext.nunit": {
+      "version": "1.0.6",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.feature.development": {
+      "version": "1.0.1",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {
+        "com.unity.ide.visualstudio": "2.0.14",
+        "com.unity.ide.rider": "3.0.13",
+        "com.unity.ide.vscode": "1.2.5",
+        "com.unity.editorcoroutines": "1.0.0",
+        "com.unity.performance.profile-analyzer": "1.1.1",
+        "com.unity.test-framework": "1.1.31",
+        "com.unity.testtools.codecoverage": "1.0.1"
+      }
+    },
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+    },
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+    },
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+      "source": "builtin",
+      "dependencies": {
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+        "com.unity.modules.animation": "1.0.0"
+      }
+    },
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+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {
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+      }
+    },
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+      "version": "1.0.0",
+      "depth": 1,
+      "source": "builtin",
+      "dependencies": {
+        "com.unity.modules.jsonserialize": "1.0.0"
+      }
+    },
+    "com.unity.modules.terrain": {
+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {}
+    },
+    "com.unity.modules.terrainphysics": {
+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {
+        "com.unity.modules.physics": "1.0.0",
+        "com.unity.modules.terrain": "1.0.0"
+      }
+    },
+    "com.unity.modules.tilemap": {
+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {
+        "com.unity.modules.physics2d": "1.0.0"
+      }
+    },
+    "com.unity.modules.ui": {
+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {}
+    },
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+        "com.unity.modules.uielementsnative": "1.0.0"
+      }
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+        "com.unity.modules.imgui": "1.0.0",
+        "com.unity.modules.jsonserialize": "1.0.0"
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+        "com.unity.modules.jsonserialize": "1.0.0"
+      }
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+      "version": "1.0.0",
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+      }
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+      "version": "1.0.0",
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+        "com.unity.modules.imageconversion": "1.0.0"
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+      "version": "1.0.0",
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+        "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
+        "com.unity.modules.unitywebrequestaudio": "1.0.0",
+        "com.unity.modules.audio": "1.0.0",
+        "com.unity.modules.assetbundle": "1.0.0",
+        "com.unity.modules.imageconversion": "1.0.0"
+      }
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+      "version": "1.0.0",
+      "depth": 0,
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+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {
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--- a/X10D.Unity.Tests/ProjectSettings/XRSettings.asset
+++ b/X10D.Unity.Tests/ProjectSettings/XRSettings.asset
@ -0,0 +1,10 @@
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--- a/X10D.Unity.Tests/ProjectSettings/boot.config
+++ b/X10D.Unity.Tests/ProjectSettings/boot.config
--- a/X10D.Unity/X10D.Unity.csproj
+++ b/X10D.Unity/X10D.Unity.csproj
@ -0,0 +1,65 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netstandard2.1</TargetFramework>
+        <LangVersion>10.0</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>icon.png</PackageIcon>
+        <PackageIconUrl/>
+        <PackageTags>dotnet extension-methods</PackageTags>
+        <CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>
+        <VersionPrefix>3.1.0</VersionPrefix>
+        <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    </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="Unity3D.SDK" Version="2021.1.14.1" PrivateAssets="All"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\X10D\X10D.csproj"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <None Include="..\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>
--- a/X10D.Unity/src/ComponentExtensions.cs
+++ b/X10D.Unity/src/ComponentExtensions.cs
@ -0,0 +1,21 @@
+using UnityEngine;
+
+namespace X10D.Unity;
+
+/// <summary>
+///     Extension methods for <see cref="Component" />.
+/// </summary>
+public static class ComponentExtensions
+{
+    /// <summary>
+    ///     Returns an array of components of the specified type, excluding components that live on the object to which this
+    ///     component is attached.
+    /// </summary>
+    /// <param name="component">The component whose child components to retrieve.</param>
+    /// <typeparam name="T">The type of the components to retrieve.</typeparam>
+    /// <returns>An array <typeparamref name="T" /> representing the child components.</returns>
+    public static T[] GetComponentsInChildrenOnly<T>(this Component component)
+    {
+        return component.gameObject.GetComponentsInChildrenOnly<T>();
+    }
+}
--- a/X10D.Unity/src/Drawing/Color32Extensions.cs
+++ b/X10D.Unity/src/Drawing/Color32Extensions.cs
@ -0,0 +1,95 @@
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+using UnityEngine;
+
+namespace X10D.Unity.Drawing;
+
+/// <summary>
+///     Drawing-related extensions for <see cref="Color32" />.
+/// </summary>
+public static class Color32Extensions
+{
+    /// <summary>
+    ///     Returns a new <see cref="Color32" /> with the red, green, and blue components inverted. Alpha is not affected.
+    /// </summary>
+    /// <param name="color">The color to invert.</param>
+    /// <returns>The inverted color.</returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color32 Inverted(this Color32 color)
+    {
+        return new Color32((byte)(255 - color.r), (byte)(255 - color.g), (byte)(255 - color.b), color.a);
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, green, and blue components are the same as the specified color, and whose alpha component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="a">The new alpha component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color32.r" />, <see cref="Color32.g" />, and
+    ///     <see cref="Color32.b" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color32.a" /> component is <paramref name="a" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color32 WithA(this Color32 color, byte a)
+    {
+        return color with {a = a};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, green, and alpha components are the same as the specified color, and whose blue component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="b">The new blue component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color32.r" />, <see cref="Color32.g" />, and
+    ///     <see cref="Color32.a" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color32.b" /> component is <paramref name="b" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color32 WithB(this Color32 color, byte b)
+    {
+        return color with {b = b};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, blue, and alpha components are the same as the specified color, and whose green component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="g">The new green component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color32" /> whose <see cref="Color32.r" />, <see cref="Color32.g" />, and
+    ///     <see cref="Color32.b" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color32.g" /> component is <paramref name="g" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color32 WithG(this Color32 color, byte g)
+    {
+        return color with {g = g};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose green, blue, and alpha components are the same as the specified color, and whose red component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="r">The new red component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color32" /> whose <see cref="Color32.g" />, <see cref="Color32.b" />, and
+    ///     <see cref="Color32.a" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color32.r" /> component is <paramref name="r" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color32 WithR(this Color32 color, byte r)
+    {
+        return color with {r = r};
+    }
+}
--- a/X10D.Unity/src/Drawing/ColorExtensions.cs
+++ b/X10D.Unity/src/Drawing/ColorExtensions.cs
@ -0,0 +1,95 @@
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+using UnityEngine;
+
+namespace X10D.Unity.Drawing;
+
+/// <summary>
+///     Drawing-related extensions for <see cref="Color" />.
+/// </summary>
+public static class ColorExtensions
+{
+    /// <summary>
+    ///     Returns a new <see cref="Color" /> with the red, green, and blue components inverted. Alpha is not affected.
+    /// </summary>
+    /// <param name="color">The color to invert.</param>
+    /// <returns>The inverted color.</returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color Inverted(this Color color)
+    {
+        return new Color(1f - color.r, 1f - color.g, 1f - color.b, color.a);
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, green, and blue components are the same as the specified color, and whose alpha component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="a">The new alpha component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color.r" />, <see cref="Color.g" />, and
+    ///     <see cref="Color.b" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color.a" /> component is <paramref name="a" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color WithA(this Color color, float a)
+    {
+        return color with {a = a};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, green, and alpha components are the same as the specified color, and whose blue component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="b">The new blue component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color.r" />, <see cref="Color.g" />, and
+    ///     <see cref="Color.a" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color.b" /> component is <paramref name="b" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color WithB(this Color color, float b)
+    {
+        return color with {b = b};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose red, blue, and alpha components are the same as the specified color, and whose green component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="g">The new green component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color.r" />, <see cref="Color.b" />, and
+    ///     <see cref="Color.a" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color.g" /> component is <paramref name="g" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color WithG(this Color color, float g)
+    {
+        return color with {g = g};
+    }
+
+    /// <summary>
+    ///     Returns a vector whose green, blue, and alpha components are the same as the specified color, and whose red component
+    ///     is a new value.
+    /// </summary>
+    /// <param name="color">The color to copy.</param>
+    /// <param name="r">The new red component value.</param>
+    /// <returns>
+    ///     A new instance of <see cref="Color" /> whose <see cref="Color.g" />, <see cref="Color.b" />, and
+    ///     <see cref="Color.a" /> components are the same as that of <paramref name="color" />, and whose
+    ///     <see cref="Color.r" /> component is <paramref name="r" />.
+    /// </returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color WithR(this Color color, float r)
+    {
+        return color with {r = r};
+    }
+}
--- a/X10D.Unity/src/Drawing/RandomExtensions.cs
+++ b/X10D.Unity/src/Drawing/RandomExtensions.cs
@ -0,0 +1,95 @@
+using UnityEngine;
+using X10D.Core;
+using Random = System.Random;
+
+namespace X10D.Unity.Drawing;
+
+/// <summary>
+///     Extension methods for <see cref="System.Random" />.
+/// </summary>
+public static class RandomExtensions
+{
+    /// <summary>
+    ///     Returns an HDR color of random components for red, green, and blue.
+    /// </summary>
+    /// <param name="random">The <see cref="System.Random" /> instance.</param>
+    /// <returns>A <see cref="Color" /> whose red, green, and blue components are all random, and whose alpha is 255</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
+    public static Color NextColorRgb(this Random random)
+    {
+        if (random is null)
+        {
+            throw new ArgumentNullException(nameof(random));
+        }
+
+        int seed = random.Next();
+        var seededRandom = new Random(seed);
+        float r = seededRandom.NextSingle();
+        float g = seededRandom.NextSingle();
+        float b = seededRandom.NextSingle();
+        return new Color(r, g, b, 1.0f);
+    }
+
+    /// <summary>
+    ///     Returns an HDR color composed of random components for apha, red, green, and blue.
+    /// </summary>
+    /// <param name="random">The <see cref="System.Random" /> instance.</param>
+    /// <returns>A <see cref="Color" /> whose alpha, red, green, and blue components are all random.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
+    public static Color NextColorArgb(this Random random)
+    {
+        if (random is null)
+        {
+            throw new ArgumentNullException(nameof(random));
+        }
+
+        int seed = random.Next();
+        var seededRandom = new Random(seed);
+        float a = seededRandom.NextSingle();
+        float r = seededRandom.NextSingle();
+        float g = seededRandom.NextSingle();
+        float b = seededRandom.NextSingle();
+        return new Color(r, g, b, a);
+    }
+
+    /// <summary>
+    ///     Returns a color of random components for red, green, and blue.
+    /// </summary>
+    /// <param name="random">The <see cref="System.Random" /> instance.</param>
+    /// <returns>A <see cref="Color" /> whose red, green, and blue components are all random, and whose alpha is 255</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
+    public static Color32 NextColor32Rgb(this Random random)
+    {
+        if (random is null)
+        {
+            throw new ArgumentNullException(nameof(random));
+        }
+
+        int rgb = random.Next();
+        var r = (byte)(rgb >> 16 & 0xFF);
+        var g = (byte)(rgb >> 8 & 0xFF);
+        var b = (byte)(rgb & 0xFF);
+        return new Color32(r, g, b, 0xFF);
+    }
+
+    /// <summary>
+    ///     Returns a color composed of random components for apha, red, green, and blue.
+    /// </summary>
+    /// <param name="random">The <see cref="System.Random" /> instance.</param>
+    /// <returns>A <see cref="Color" /> whose alpha, red, green, and blue components are all random.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
+    public static Color32 NextColor32Argb(this Random random)
+    {
+        if (random is null)
+        {
+            throw new ArgumentNullException(nameof(random));
+        }
+
+        int argb = random.Next();
+        var a = (byte)(argb >> 24 & 0xFF);
+        var r = (byte)(argb >> 16 & 0xFF);
+        var g = (byte)(argb >> 8 & 0xFF);
+        var b = (byte)(argb & 0xFF);
+        return new Color32(r, g, b, a);
+    }
+}
--- a/X10D.Unity/src/GameObjectExtensions.cs
+++ b/X10D.Unity/src/GameObjectExtensions.cs
@ -0,0 +1,317 @@
+using UnityEngine;
+
+namespace X10D.Unity;
+
+/// <summary>
+///     Extension methods for <see cref="GameObject" />.
+/// </summary>
+public static class GameObjectExtensions
+{
+    /// <summary>
+    ///     Returns an array of components of the specified type, excluding components that live on this game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose child components to retrieve.</param>
+    /// <typeparam name="T">The type of the components to retrieve.</typeparam>
+    /// <returns>An array <typeparamref name="T" /> representing the child components.</returns>
+    public static T[] GetComponentsInChildrenOnly<T>(this GameObject gameObject)
+    {
+        var components = new List<T>(gameObject.GetComponentsInChildren<T>());
+
+        for (var index = 0; index < components.Count; index++)
+        {
+            if (components[index] is not Component childComponent)
+            {
+                // this shouldn't happen, since you can't add a non-Component to a game object,
+                // but GetComponentsInChildren<T> is not constrained, so this method shouldn't be either
+                continue;
+            }
+
+            if (childComponent.transform.parent != gameObject.transform)
+            {
+                components.RemoveAt(index);
+                index--;
+            }
+        }
+
+        return components.ToArray();
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at another game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The game object to look at.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="target" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void LookAt(this GameObject gameObject, GameObject target)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (target == null)
+        {
+            throw new ArgumentNullException(nameof(target));
+        }
+
+        gameObject.transform.LookAt(target.transform);
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at <paramref name="target" />.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The point to look at.</param>
+    /// <exception cref="ArgumentNullException"><paramref name="gameObject" /> is <see langword="null" />.</exception>
+    public static void LookAt(this GameObject gameObject, Vector3 target)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        gameObject.transform.LookAt(target);
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at a specified transform.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The transform to look at.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="target" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void LookAt(this GameObject gameObject, Transform target)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (target == null)
+        {
+            throw new ArgumentNullException(nameof(target));
+        }
+
+        gameObject.transform.LookAt(target);
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at another game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The game object to look at.</param>
+    /// <param name="worldUp">A vector specifying the upward direction.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="target" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void LookAt(this GameObject gameObject, GameObject target, Vector3 worldUp)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (target == null)
+        {
+            throw new ArgumentNullException(nameof(target));
+        }
+
+        gameObject.transform.LookAt(target.transform, worldUp);
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at <paramref name="target" />.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The point to look at.</param>
+    /// <param name="worldUp">A vector specifying the upward direction.</param>
+    /// <exception cref="ArgumentNullException"><paramref name="gameObject" /> is <see langword="null" />.</exception>
+    public static void LookAt(this GameObject gameObject, Vector3 target, Vector3 worldUp)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        gameObject.transform.LookAt(target, worldUp);
+    }
+
+    /// <summary>
+    ///     Rotates the transform component of this game object so the forward vector points at a specified transform.
+    /// </summary>
+    /// <param name="gameObject">The game object whose rotation will be changed.</param>
+    /// <param name="target">The transform to look at.</param>
+    /// <param name="worldUp">A vector specifying the upward direction.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="target" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void LookAt(this GameObject gameObject, Transform target, Vector3 worldUp)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (target == null)
+        {
+            throw new ArgumentNullException(nameof(target));
+        }
+
+        gameObject.transform.LookAt(target, worldUp);
+    }
+
+    /// <summary>
+    ///      Sets the new layer of this game object and its children, recursively.
+    /// </summary>
+    /// <param name="gameObject">The game object whose layer, and that of its children recursively, to change.</param>
+    /// <param name="layer">The new layer.</param>
+    /// <exception cref="ArgumentNullException"><paramref name="gameObject" /> is <see langword="null" />.</exception>
+    public static void SetLayerRecursively(this GameObject gameObject, int layer)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        var children = new Stack<Transform>();
+        var transform = gameObject.transform;
+        children.Push(transform);
+
+        while (children.Count > 0)
+        {
+            Transform child = children.Pop();
+            int childCount = child.childCount;
+
+            child.gameObject.layer = layer;
+
+            if (childCount <= 0)
+            {
+                continue;
+            }
+
+            for (var childIndex = 0; childIndex < childCount; childIndex++)
+            {
+                children.Push(child.GetChild(childIndex));
+            }
+        }
+    }
+
+    /// <summary>
+    ///     Sets the parent of this game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose parent to change.</param>
+    /// <param name="parent">The new parent.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="parent" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void SetParent(this GameObject gameObject, GameObject parent)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (parent == null)
+        {
+            throw new ArgumentNullException(nameof(parent));
+        }
+
+        gameObject.transform.SetParent(parent.transform);
+    }
+
+    /// <summary>
+    ///     Sets the parent of this game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose parent to change.</param>
+    /// <param name="parent">The new parent.</param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="parent" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void SetParent(this GameObject gameObject, Transform parent)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (parent == null)
+        {
+            throw new ArgumentNullException(nameof(parent));
+        }
+
+        gameObject.transform.SetParent(parent);
+    }
+
+    /// <summary>
+    ///     Sets the parent of this game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose parent to change.</param>
+    /// <param name="parent">The new parent.</param>
+    /// <param name="worldPositionStays">
+    ///     <see langword="true" /> to modify the parent-relative position, scale and rotation such that the object keeps the same
+    ///     world space position, rotation and scale as before; otherwise, <see langword="false" />.
+    /// </param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="parent" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void SetParent(this GameObject gameObject, GameObject parent, bool worldPositionStays)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (parent == null)
+        {
+            throw new ArgumentNullException(nameof(parent));
+        }
+
+        gameObject.transform.SetParent(parent.transform, worldPositionStays);
+    }
+
+    /// <summary>
+    ///     Sets the parent of this game object.
+    /// </summary>
+    /// <param name="gameObject">The game object whose parent to change.</param>
+    /// <param name="parent">The new parent.</param>
+    /// <param name="worldPositionStays">
+    ///     <see langword="true" /> to modify the parent-relative position, scale and rotation such that the object keeps the same
+    ///     world space position, rotation and scale as before; otherwise, <see langword="false" />.
+    /// </param>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="gameObject" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="parent" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void SetParent(this GameObject gameObject, Transform parent, bool worldPositionStays)
+    {
+        if (gameObject == null)
+        {
+            throw new ArgumentNullException(nameof(gameObject));
+        }
+
+        if (parent == null)
+        {
+            throw new ArgumentNullException(nameof(parent));
+        }
+
+        gameObject.transform.SetParent(parent, worldPositionStays);
+    }
+}
--- a/X10D.Unity/src/Numerics/QuaternionExtensions.cs
+++ b/X10D.Unity/src/Numerics/QuaternionExtensions.cs
@ -0,0 +1,35 @@
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+using UnityEngine;
+
+namespace X10D.Unity.Numerics;
+
+/// <summary>
+///     Numeric-extensions for <see cref="Quaternion" />.
+/// </summary>
+public static class QuaternionExtensions
+{
+    /// <summary>
+    ///     Converts the current quaternion to a <see cref="System.Numerics.Quaternion" />.
+    /// </summary>
+    /// <param name="quaternion">The quaternion to convert.</param>
+    /// <returns>The converted quaternion.</returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static System.Numerics.Quaternion ToSystemQuaternion(this Quaternion quaternion)
+    {
+        return new System.Numerics.Quaternion(quaternion.x, quaternion.y, quaternion.z, quaternion.w);
+    }
+
+    /// <summary>
+    ///     Converts the current quaternion to a <see cref="Quaternion" />.
+    /// </summary>
+    /// <param name="quaternion">The quaternion to convert.</param>
+    /// <returns>The converted quaternion.</returns>
+    [Pure]
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Quaternion ToUnityQuaternion(this System.Numerics.Quaternion quaternion)
+    {
+        return new Quaternion(quaternion.X, quaternion.Y, quaternion.Z, quaternion.W);
+    }
+}
--- a/Show More
+++ b/Show More