Moved all UnitTests to a single project. Implemented parts of AspNetCore UnitTests.

UnitTests/Common/Utils/TimeZoneInfoLocalMock.cs

@@ -0,0 +1,26 @@
+using System;
+using ReflectionMagic;
+
+namespace UnitTests.Common.Utils
+{
+	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+	internal class TimeZoneInfoLocalMock : IDisposable
+	{
+		private readonly TimeZoneInfo localTimeZoneInfo;
+
+		private TimeZoneInfoLocalMock(TimeZoneInfo timeZoneInfo)
+		{
+			localTimeZoneInfo = TimeZoneInfo.Local;
+			SetLocalTimeZone(timeZoneInfo);
+		}
+
+		public static IDisposable Create(TimeZoneInfo mockTimeZoneInfo)
+			=> new TimeZoneInfoLocalMock(mockTimeZoneInfo);
+
+		public void Dispose()
+			=> SetLocalTimeZone(localTimeZoneInfo);
+
+		private static void SetLocalTimeZone(TimeZoneInfo timeZoneInfo)
+			=> typeof(TimeZoneInfo).AsDynamicType().s_cachedData._localTimeZone = timeZoneInfo;
+	}
+}