Add a MSTest sample with a program.cs (#4201)

samples/public/mstest-runner/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35507.96 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MSTestProjectWithExplicitMain", "MSTestProjectWithExplicitMain\MSTestProjectWithExplicitMain.csproj", "{3F00FD7B-D9E6-42C6-8607-3186BFBD4A0F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3F00FD7B-D9E6-42C6-8607-3186BFBD4A0F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3F00FD7B-D9E6-42C6-8607-3186BFBD4A0F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3F00FD7B-D9E6-42C6-8607-3186BFBD4A0F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3F00FD7B-D9E6-42C6-8607-3186BFBD4A0F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {68CE81DD-68F6-49B0-87AF-DC6223F45845}
+	EndGlobalSection
+EndGlobal

samples/public/mstest-runner/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <EnableMSTestRunner>true</EnableMSTestRunner>
+    <OutputType>Exe</OutputType>
+    <TestingPlatformDotnetTestSupport>true</TestingPlatformDotnetTestSupport>
+    <!--
+      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>
+
+    <GenerateTestingPlatformEntryPoint>false</GenerateTestingPlatformEntryPoint>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="17.12.6" />
+    <PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="1.4.0" />
+    <PackageReference Include="MSTest" Version="3.6.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+</Project>

samples/public/mstest-runner/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain/MSTestSettings.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]

samples/public/mstest-runner/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain/Program.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Reflection;
+
+using Microsoft.Testing.Extensions;
+using Microsoft.Testing.Platform.Builder;
+
+// Create the test application builder
+ITestApplicationBuilder testApplicationBuilder = await TestApplication.CreateBuilderAsync(args);
+
+// Register the testing framework
+testApplicationBuilder.AddMSTest(() => new[] { Assembly.GetExecutingAssembly() });
+
+// Register Code Coverage extension
+testApplicationBuilder.AddCodeCoverageProvider();
+
+// Register TRX report extension
+testApplicationBuilder.AddTrxReportProvider();
+
+// Register Telemetry extension
+testApplicationBuilder.AddAppInsightsTelemetryProvider();
+
+// Alternatively, instead of registering everything manually, I could rely on the MSBuild hooks and use
+// testApplicationBuilder.AddSelfRegisteredExtensions(args);
+// This is what is called by the generated entry point
+
+// In addition to be using each extension helper method, we can directly register extensions to each of
+// the extensibility area. For now, the following 3 are exposed:
+// testApplicationBuilder.CommandLine
+// testApplicationBuilder.TestHost
+// testApplicationBuilder.TestHostControllers
+// but the goal is to also expose all these areas: https://github.com/microsoft/testfx/blob/main/src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.cs#L57-L69
+
+// NOTE that registering an extension is not enough and each extension has some activation criteria,
+// most of the time the presence of a command line option but it could be anything (including nothing).
+
+// Build the test app
+using ITestApplication testApplication = await testApplicationBuilder.BuildAsync();
+
+// Run the test app
+return await testApplication.RunAsync();

samples/public/mstest-runner/MSTestProjectWithExplicitMain/MSTestProjectWithExplicitMain/Test1.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace MSTestProjectWithExplicitMain;
+
+[TestClass]
+public sealed class Test1
+{
+    [TestMethod]
+    public void TestMethod1()
+    {
+    }
+}