Add MSTest testing samples

test/README.md

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+# .NET testing samples
+
+This directory contains minimal examples that demonstrate how to use common .NET testing frameworks with different test platforms.
+
+## MSTest
+
+The MSTest samples demonstrate the same test using two different test platforms:
+
+- [VSTest](mstest/vstest)
+- [Microsoft.Testing.Platform](mstest/microsoft-testing-platform)
+
+### VSTest
+
+The VSTest sample uses MSTest with the VSTest platform.
+
+To run the sample from this directory:
+
+```bash
+dotnet test mstest/vstest/MSTestVSTest.csproj
+```
+
+### Microsoft.Testing.Platform
+
+The Microsoft.Testing.Platform sample uses `MSTest.Sdk` and the MSTest runner based on Microsoft.Testing.Platform.
+
+To run the sample from this directory:
+
+```bash
+dotnet test mstest/microsoft-testing-platform/MSTestMTP.csproj
+```
+
+Both samples contain the same minimal test so that the differences between the test platform configurations are easy to compare.
+
+Additional testing framework samples can be added in separate directories.

test/mstest/microsoft-testing-platform/CalculatorTests.cs

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+namespace MSTestMTP;
+
+[TestClass]
+public sealed class CalculatorTests
+{
+    [TestMethod]
+    public void Add_TwoNumbers_ReturnsExpectedSum()
+    {
+        int result = 2 + 3;
+
+        Assert.AreEqual(5, result);
+    }
+}

test/mstest/microsoft-testing-platform/MSTestMTP.csproj

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+<Project Sdk="MSTest.Sdk/3.6.4">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <RootNamespace>microsoft_testing_platform</RootNamespace>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <!--
+      Displays error on console in addition to the log file. Note that this feature comes with a performance impact.
+      For more information, visit https://learn.microsoft.com/dotnet/core/testing/unit-testing-platform-integration-dotnet-test#show-failure-per-test
+      -->
+    <TestingPlatformShowTestsFailure>true</TestingPlatformShowTestsFailure>
+  </PropertyGroup>
+
+</Project>

test/mstest/vstest/CalculatorTests.cs

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+namespace MSTestVSTest;
+
+[TestClass]
+public sealed class CalculatorTests
+{
+    [TestMethod]
+    public void Add_TwoNumbers_ReturnsExpectedSum()
+    {
+        int result = 2 + 3;
+
+        Assert.AreEqual(5, result);
+    }
+}

test/mstest/vstest/MSTestVSTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="MSTest" Version="3.6.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+</Project>