Tests added.

Author: konard

Platform.Threading.sln

@@ -5,6 +5,8 @@ VisualStudioVersion = 16.0.29020.237
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading", "csharp\Platform.Threading\Platform.Threading.csproj", "{F7E3F718-E566-4358-9958-CF0E5730B6A6}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading.Tests", "csharp\Platform.Threading.Tests\Platform.Threading.Tests.csproj", "{0DA6066D-905B-4045-89E8-51C857891DE4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{F7E3F718-E566-4358-9958-CF0E5730B6A6}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F7E3F718-E566-4358-9958-CF0E5730B6A6}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F7E3F718-E566-4358-9958-CF0E5730B6A6}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0DA6066D-905B-4045-89E8-51C857891DE4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0DA6066D-905B-4045-89E8-51C857891DE4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0DA6066D-905B-4045-89E8-51C857891DE4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0DA6066D-905B-4045-89E8-51C857891DE4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

csharp/Platform.Threading.Tests/Platform.Threading.Tests.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net472;netcoreapp2.1;netcoreapp3.0</TargetFrameworks>
+    <IsPackable>false</IsPackable>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup Condition="$(TargetFramework.StartsWith('net4')) AND '$(MSBuildRuntimeType)' == 'Core' AND '$(OS)' != 'Windows_NT'">
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" PrivateAssets="All" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" PrivateAssets="All" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Platform.Threading\Platform.Threading.csproj" />
+  </ItemGroup>
+
+</Project>

csharp/Platform.Threading.Tests/ThreadHelpersTests.cs

@@ -0,0 +1,21 @@
+using Xunit;
+
+namespace Platform.Threading.Tests
+{
+    public class ThreadHelpersTests
+    {
+        [Fact]
+        public void InvokeTest()
+        {
+            var number = 0;
+            ThreadHelpers.InvokeWithExtendedMaxStackSize(() => number = 1);
+            Assert.Equal(1, number);
+            ThreadHelpers.InvokeWithExtendedMaxStackSize(2, (param) => number = (int)param);
+            Assert.Equal(2, number);
+            ThreadHelpers.InvokeWithModifiedMaxStackSize(() => number = 1, maxStackSize: 512);
+            Assert.Equal(1, number);
+            ThreadHelpers.InvokeWithModifiedMaxStackSize(2, (param) => number = (int)param, maxStackSize: 512);
+            Assert.Equal(2, number);
+        }
+    }
+}