[rel/3.7] Add tests for Polyfill type forwarding (#4797)

Co-authored-by: Youssef1313 <youssefvictor00@gmail.com>

test/IntegrationTests/MSTest.Acceptance.IntegrationTests/WinUITests.cs

@@ -0,0 +1,90 @@
+// 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.Runtime.InteropServices;
+
+using Microsoft.Testing.Platform.Acceptance.IntegrationTests;
+using Microsoft.Testing.Platform.Acceptance.IntegrationTests.Helpers;
+using Microsoft.Testing.Platform.Helpers;
+
+namespace MSTest.Acceptance.IntegrationTests;
+
+[TestGroup]
+public sealed class WinUITests : AcceptanceTestBase
+{
+    private static readonly string WinUITargetFramework = $"{TargetFrameworks.NetCurrent.Arguments}-windows10.0.19041.0";
+    private readonly TestAssetFixture _testAssetFixture;
+
+    public WinUITests(ITestExecutionContext testExecutionContext, TestAssetFixture testAssetFixture)
+        : base(testExecutionContext) => _testAssetFixture = testAssetFixture;
+
+    public async Task SimpleWinUITestCase()
+    {
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        {
+            // WinUI is Windows-only :)
+            return;
+        }
+
+        var testHost = TestHost.LocateFrom(_testAssetFixture.ProjectPath, TestAssetFixture.ProjectName, WinUITargetFramework);
+        TestHostResult testHostResult = await testHost.ExecuteAsync();
+
+        // Assert
+        testHostResult.AssertExitCodeIs(ExitCodes.Success);
+        testHostResult.AssertOutputContainsSummary(failed: 0, passed: 1, skipped: 0);
+    }
+
+    [TestFixture(TestFixtureSharingStrategy.PerTestGroup)]
+    public sealed class TestAssetFixture(AcceptanceFixture acceptanceFixture) : TestAssetFixtureBase(acceptanceFixture.NuGetGlobalPackagesFolder)
+    {
+        public const string ProjectName = "WinUITests";
+
+        public string ProjectPath => GetAssetPath(ProjectName);
+
+        public override IEnumerable<(string ID, string Name, string Code)> GetAssetsToGenerate()
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                // WinUI is Windows-only :)
+                yield break;
+            }
+
+            yield return (ProjectName, ProjectName,
+                SourceCode
+                .PatchCodeWithReplace("$TargetFramework$", WinUITargetFramework)
+                .PatchCodeWithReplace("$MSTestVersion$", MSTestVersion));
+        }
+
+        private const string SourceCode = """
+#file WinUITests.csproj
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <EnableMSTestRunner>true</EnableMSTestRunner>
+    <TargetFramework>$TargetFramework$</TargetFramework>
+    <UseWinUI>true</UseWinUI>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MSTest.TestAdapter" Version="$MSTestVersion$" />
+    <PackageReference Include="MSTest.TestFramework" Version="$MSTestVersion$" />
+  </ItemGroup>
+
+</Project>
+
+#file UnitTest1.cs
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+[TestClass]
+public class TestClass1
+{
+    [TestMethod]
+    public void TestMethod1()
+    {
+    }
+}
+""";
+    }
+}

test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/TypeForwardingTests.cs

@@ -0,0 +1,86 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Testing.Platform.Acceptance.IntegrationTests.Helpers;
+using Microsoft.Testing.Platform.Helpers;
+
+namespace Microsoft.Testing.Platform.Acceptance.IntegrationTests;
+
+[TestGroup]
+public class TypeForwardingTests : AcceptanceTestBase
+{
+    private const string AssetName = "TypeForwardingTests";
+
+    private readonly AcceptanceFixture _acceptanceFixture;
+
+    // The idea of this test is to have a netstandard2.0 library that sets an init-only property.
+    // The library is compiled against netstandard2.0 API of MTP. So, IsExternalInit is coming through Polyfill.
+    // Then, console app is consuming the library and uses the latest TFM for MTP, which has IsExternalInit from BCL.
+    // What happens now is:
+    // At IL-level (compile-time), IsExternalInit from Polyfill is accessed.
+    // At runtime, IsExternalInit doesn't exist from Polyfill and exists only through BCL.
+    // For this situation to work, a TypeForwardedTo(typeof(IsExternalInit)) is needed in MTP when
+    // compiling for a TFM that has IsExternalInit from BCL.
+    // See https://github.com/SimonCropp/Polyfill/issues/290
+    private const string Sources = """
+        #file ClassLib/ClassLib.csproj
+        <Project Sdk="Microsoft.NET.Sdk">
+          <PropertyGroup>
+            <TargetFramework>netstandard2.0</TargetFramework>
+            <OutputType>Library</OutputType>
+            <Nullable>enable</Nullable>
+            <LangVersion>preview</LangVersion>
+          </PropertyGroup>
+          <ItemGroup>
+            <PackageReference Include="Microsoft.Testing.Platform" Version="$MicrosoftTestingPlatformVersion$" />
+          </ItemGroup>
+        </Project>
+
+        #file ClassLib/MyClassCompiledAgainstNetStandardBinary.cs
+        using Microsoft.Testing.Platform.Extensions.Messages;
+
+        public static class MyClassCompiledAgainstNetStandardBinary
+        {
+            public static TestNode M()
+                => new TestNode() { DisplayName = "MyDisplayName", Uid = new("MyUid") };
+        }
+
+        #file ConsoleApp/ConsoleApp.csproj
+
+        <Project Sdk="Microsoft.NET.Sdk">
+          <PropertyGroup>
+            <TargetFramework>$TargetFrameworks$</TargetFramework>
+            <OutputType>Exe</OutputType>
+            <Nullable>enable</Nullable>
+            <LangVersion>preview</LangVersion>
+          </PropertyGroup>
+          <ItemGroup>
+            <ProjectReference Include="..\ClassLib\ClassLib.csproj" Version="$MicrosoftTestingPlatformVersion$" />
+          </ItemGroup>
+        </Project>
+
+        #file ConsoleApp/Program.cs
+        using System;
+
+        Console.WriteLine(MyClassCompiledAgainstNetStandardBinary.M().DisplayName);
+        """;
+
+    public TypeForwardingTests(ITestExecutionContext testExecutionContext, AcceptanceFixture acceptanceFixture)
+        : base(testExecutionContext) => _acceptanceFixture = acceptanceFixture;
+
+    public async Task SettingDisplayNameFromNetStandardLibraryDuringNetCurrentRuntimeExecutionShouldNotCrash()
+    {
+        string patchedSources = Sources
+            .PatchTargetFrameworks(TargetFrameworks.NetCurrent)
+            .PatchCodeWithReplace("$MicrosoftTestingPlatformVersion$", MicrosoftTestingPlatformVersion);
+
+        TestAsset testAsset = await TestAsset.GenerateAssetAsync(AssetName, patchedSources);
+        await DotnetCli.RunAsync($"build -m:1 -nodeReuse:false {testAsset.TargetAssetPath}/ConsoleApp -c Release", _acceptanceFixture.NuGetGlobalPackagesFolder.Path);
+
+        var testHost = TestInfrastructure.TestHost.LocateFrom($"{testAsset.TargetAssetPath}/ConsoleApp", "ConsoleApp", TargetFrameworks.NetCurrent.Arguments);
+        TestHostResult testHostResult = await testHost.ExecuteAsync();
+
+        testHostResult.AssertExitCodeIs(ExitCodes.Success);
+        testHostResult.AssertOutputContains("MyDisplayName");
+    }
+}