diff --git a/X10D.Tests/src/Core/DateTimeTests.cs b/X10D.Tests/src/Core/DateTimeTests.cs
deleted file mode 100644
index a670af9..0000000
--- a/X10D.Tests/src/Core/DateTimeTests.cs
+++ /dev/null
@@ -1,107 +0,0 @@
-namespace X10D.Tests.Core
-{
-    using System;
-    using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-    /// <summary>
-    ///     Tests for <see cref="DateTimeExtensions" />.
-    /// </summary>
-    [TestClass]
-    public class DateTimeTests
-    {
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.Age(DateTime)" />.
-        /// </summary>
-        [TestMethod]
-        public void Age()
-        {
-            // no choice but to create dynamic based on today's date.
-            // age varies with time
-            var now = DateTime.Now;
-            var dt = new DateTime(now.Year - 18, 1, 1);
-
-            Assert.AreEqual(18, dt.Age());
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.First" />.
-        /// </summary>
-        [TestMethod]
-        public void First()
-        {
-            var dt = new DateTime(2018, 6, 20);
-
-            Assert.AreEqual(4, dt.First(DayOfWeek.Monday).Day);
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.FirstDayOfMonth" />.
-        /// </summary>
-        [TestMethod]
-        public void FirstDayOfMonth()
-        {
-            var dt = new DateTime(2018, 6, 20);
-            var first = dt.FirstDayOfMonth();
-
-            Assert.AreEqual(dt.Year, first.Year);
-            Assert.AreEqual(dt.Month, first.Month);
-            Assert.AreEqual(1, first.Day);
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.Last" />.
-        /// </summary>
-        [TestMethod]
-        public void Last()
-        {
-            {
-                var dt = new DateTime(2019, 12, 1);
-                var last = dt.Last(DayOfWeek.Wednesday);
-
-                Assert.AreEqual(dt.Year, last.Year);
-                Assert.AreEqual(dt.Month, last.Month);
-                Assert.AreEqual(25, last.Day);
-            }
-
-            {
-                var dt = new DateTime(2020, 4, 14);
-                var last = dt.Last(DayOfWeek.Friday);
-
-                Assert.AreEqual(dt.Year, last.Year);
-                Assert.AreEqual(dt.Month, last.Month);
-                Assert.AreEqual(24, last.Day);
-
-                last = dt.Last(DayOfWeek.Thursday);
-                Assert.AreEqual(dt.Year, last.Year);
-                Assert.AreEqual(dt.Month, last.Month);
-                Assert.AreEqual(30, last.Day);
-            }
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.LastDayOfMonth" />.
-        /// </summary>
-        [TestMethod]
-        public void LastDayOfMonth()
-        {
-            var dt = new DateTime(2016, 2, 4);
-            var last = dt.LastDayOfMonth();
-
-            Assert.AreEqual(dt.Year, last.Year);
-            Assert.AreEqual(dt.Month, last.Month);
-            Assert.AreEqual(29, last.Day); // 2016 is a leap year
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DateTimeExtensions.ToUnixTimeStamp" />.
-        /// </summary>
-        [TestMethod]
-        public void ToUnixTimestamp()
-        {
-            var dt = new DateTime(2015, 10, 21, 1, 0, 0, DateTimeKind.Utc);
-            var unix = dt.ToUnixTimeStamp();
-
-            Assert.AreEqual(1445389200L, unix);
-        }
-    }
-}
diff --git a/X10D.Tests/src/Core/DictionaryTests.cs b/X10D.Tests/src/Core/DictionaryTests.cs
deleted file mode 100644
index 983fc9b..0000000
--- a/X10D.Tests/src/Core/DictionaryTests.cs
+++ /dev/null
@@ -1,42 +0,0 @@
-namespace X10D.Tests.Core
-{
-    using System.Collections.Generic;
-    using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-    /// <summary>
-    ///     Tests for <see cref="DictionaryExtensions" />.
-    /// </summary>
-    [TestClass]
-    public class DictionaryTests
-    {
-        /// <summary>
-        ///     Tests for <see cref="DictionaryExtensions.ToConnectionString{T1,T2}(IDictionary{T1,T2})" />.
-        /// </summary>
-        [TestMethod]
-        public void ToConnectionString()
-        {
-            var dictionary = new Dictionary<string, object>
-            {
-                { "username", "Foo" }, { "password", "Foo Bar" }, { "port", 3306 },
-            };
-
-            var connectionString = dictionary.ToConnectionString();
-            Assert.AreEqual("username=Foo;password=\"Foo Bar\";port=3306", connectionString);
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="DictionaryExtensions.ToGetParameters{T1,T2}(IDictionary{T1,T2})" />.
-        /// </summary>
-        [TestMethod]
-        public void ToGetParameters()
-        {
-            var dictionary = new Dictionary<string, object>
-            {
-                { "username", "Foo" }, { "password", "Foo Bar" }, { "port", 3306 },
-            };
-
-            var getParameterString = dictionary.ToGetParameters();
-            Assert.AreEqual("username=Foo&password=Foo+Bar&port=3306", getParameterString);
-        }
-    }
-}
diff --git a/X10D.Tests/src/Core/EnumerableTests.cs b/X10D.Tests/src/Core/EnumerableTests.cs
deleted file mode 100644
index 6da9ac3..0000000
--- a/X10D.Tests/src/Core/EnumerableTests.cs
+++ /dev/null
@@ -1,55 +0,0 @@
-namespace X10D.Tests.Core
-{
-    using System.Collections.Generic;
-    using System.Linq;
-    using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-    /// <summary>
-    ///     Tests for <see cref="EnumerableExtensions" />.
-    /// </summary>
-    [TestClass]
-    public class EnumerableTests
-    {
-        /// <summary>
-        ///     Tests for <see cref="EnumerableExtensions.Split{T}" /> using an array of <see cref="byte" />.
-        /// </summary>
-        [TestMethod]
-        public void SplitByte()
-        {
-            byte[] foo = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
-            IEnumerable<IEnumerable<byte>> chunks = foo.Split(2).ToArray();
-
-            Assert.AreEqual(4, chunks.Count());
-            CollectionAssert.AreEqual(new byte[] { 0x01, 0x02 }, chunks.ElementAt(0).ToList());
-            CollectionAssert.AreEqual(new byte[] { 0x03, 0x04 }, chunks.ElementAt(1).ToList());
-            CollectionAssert.AreEqual(new byte[] { 0x05, 0x06 }, chunks.ElementAt(2).ToList());
-            CollectionAssert.AreEqual(new byte[] { 0x07, 0x08 }, chunks.ElementAt(3).ToList());
-
-            // test exceeding chunk size
-            chunks = foo.Split(foo.Length + 10).ToArray();
-            Assert.AreEqual(1, chunks.Count());
-            CollectionAssert.AreEqual(foo, chunks.SelectMany(c => c).ToList());
-        }
-
-        /// <summary>
-        ///     Tests for <see cref="EnumerableExtensions.Split{T}" /> using an array of <see cref="int" />.
-        /// </summary>
-        [TestMethod]
-        public void SplitInt32()
-        {
-            int[] foo = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
-            IEnumerable<IEnumerable<int>> chunks = foo.Split(2).ToArray();
-
-            Assert.AreEqual(4, chunks.Count());
-            CollectionAssert.AreEqual(new[] { 0x01, 0x02 }, chunks.ElementAt(0).ToList());
-            CollectionAssert.AreEqual(new[] { 0x03, 0x04 }, chunks.ElementAt(1).ToList());
-            CollectionAssert.AreEqual(new[] { 0x05, 0x06 }, chunks.ElementAt(2).ToList());
-            CollectionAssert.AreEqual(new[] { 0x07, 0x08 }, chunks.ElementAt(3).ToList());
-
-            // test exceeding chunk size
-            chunks = foo.Split(foo.Length + 10).ToArray();
-            Assert.AreEqual(1, chunks.Count());
-            CollectionAssert.AreEqual(foo, chunks.SelectMany(c => c).ToList());
-        }
-    }
-}
diff --git a/X10D.Tests/src/Core/ReflectionTests.cs b/X10D.Tests/src/Core/ReflectionTests.cs
deleted file mode 100644
index b182a4b..0000000
--- a/X10D.Tests/src/Core/ReflectionTests.cs
+++ /dev/null
@@ -1,70 +0,0 @@
-namespace X10D.Tests.Core
-{
-    using System;
-    using System.ComponentModel;
-    using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-    /// <summary>
-    ///     Tests for <see cref="ReflectionExtensions" />.
-    /// </summary>
-    [TestClass]
-    public class ReflectionTests
-    {
-        /// <summary>
-        ///     Test for <see cref="ReflectionExtensions.GetDefaultValue{T}(System.Reflection.MemberInfo)" />.
-        /// </summary>
-        [TestMethod]
-        public void GetDefaultValue()
-        {
-            var klass = new TestClass();
-
-            foreach (var property in klass.GetType().GetProperties())
-            {
-                Assert.AreEqual("Foo", property.GetDefaultValue<string>());
-            }
-        }
-
-        /// <summary>
-        ///     Test for <see cref="ReflectionExtensions.GetDescription(System.Reflection.MemberInfo)" />.
-        /// </summary>
-        [TestMethod]
-        public void GetDescription()
-        {
-            var klass = new TestClass();
-
-            foreach (var property in klass.GetType().GetProperties())
-            {
-                Assert.AreEqual("Test description", property.GetDescription());
-            }
-        }
-
-        /// <summary>
-        ///     Test for <see cref="ReflectionExtensions.GetDescription(System.Reflection.MemberInfo)" />.
-        /// </summary>
-        [TestMethod]
-        public void SelectFromCustomAttribute()
-        {
-            var klass = new TestClass();
-
-            foreach (var property in klass.GetType().GetProperties())
-            {
-                var value = property.SelectFromCustomAttribute<TestAttribute, string>(a => a.TestValue);
-                Assert.AreEqual("Bar", value);
-            }
-        }
-
-        [AttributeUsage(AttributeTargets.Property)]
-        private sealed class TestAttribute : Attribute
-        {
-            public string TestValue { get; set; }
-        }
-
-        private sealed class TestClass
-        {
-            [System.ComponentModel.Description("Test description")]
-            [DefaultValue("Foo")]
-            [Test(TestValue = "Bar")]
-            public string TestProperty { get; set; }
-        }
-    }
-}
diff --git a/X10D.Tests/src/Core/TimeSpanParserTests.cs b/X10D.Tests/src/Core/TimeSpanParserTests.cs
deleted file mode 100644
index bbbb5e7..0000000
--- a/X10D.Tests/src/Core/TimeSpanParserTests.cs
+++ /dev/null
@@ -1,26 +0,0 @@
-namespace X10D.Tests.Core
-{
-    using System;
-    using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-    /// <summary>
-    ///     Tests for <see cref="TimeSpanParser" />.
-    /// </summary>
-    [TestClass]
-    public class TimeSpanParserTests
-    {
-        /// <summary>
-        ///     Tests for <see cref="TimeSpanParser.Parse" />.
-        /// </summary>
-        [TestMethod]
-        public void TestParser()
-        {
-            Assert.AreEqual(TimeSpan.FromHours(3), "3h".ToTimeSpan());
-            Assert.AreEqual(TimeSpan.FromMinutes(2.5), "2.5m".ToTimeSpan());
-            Assert.AreEqual(TimeSpan.FromHours(1), "60m".ToTimeSpan());
-            Assert.AreEqual(TimeSpan.FromDays(1), "1d".ToTimeSpan());
-            Assert.AreEqual(TimeSpan.FromDays(8), "1w 1d".ToTimeSpan());
-            Assert.AreEqual(TimeSpan.FromDays(8), "1w1d".ToTimeSpan());
-        }
-    }
-}