Add test for forward compat

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

@@ -0,0 +1,137 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace Microsoft.Testing.Platform.Acceptance.IntegrationTests;
+
+[TestClass]
+public class ForwardCompatibilityTests : AcceptanceTestBase<ForwardCompatibilityTests.TestAssetFixture>
+{
+    private const string AssetName = "ForwardCompatibilityTest";
+
+    [TestMethod]
+    public async Task NewerPlatform_WithPreviousExtensions_ShouldExecuteTests()
+    {
+        var testHost = TestInfrastructure.TestHost.LocateFrom(AssetFixture.TargetAssetPath, AssetName, TargetFrameworks.NetCurrent);
+        TestHostResult testHostResult = await testHost.ExecuteAsync("--crashdump --hangdump --report-trx --retry-failed-tests 3", cancellationToken: TestContext.CancellationToken);
+
+        testHostResult.AssertExitCodeIs(ExitCodes.Success);
+        testHostResult.AssertOutputContainsSummary(0, 1, 0);
+
+        string testResultsPath = Path.Combine(testHost.DirectoryName, "TestResults");
+        Assert.IsTrue(Directory.Exists(testResultsPath), $"TestResults directory should exist at: {testResultsPath}");
+
+        string[] trxFiles = Directory.GetFiles(testResultsPath, "*.trx", SearchOption.TopDirectoryOnly);
+        Assert.IsNotEmpty(trxFiles, $"At least one TRX file should be generated in: {testResultsPath}");
+    }
+
+    public sealed class TestAssetFixture() : TestAssetFixtureBase(AcceptanceFixture.NuGetGlobalPackagesFolder)
+    {
+        private const string PreviousExtensionVersion = "2.0.0";
+
+        private const string ForwardCompatibilityTestCode = """
+#file ForwardCompatibilityTest.csproj
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFrameworks>$TargetFrameworks$</TargetFrameworks>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <OutputType>Exe</OutputType>
+        <LangVersion>preview</LangVersion>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <!-- Use the locally built (newer) version of the platform -->
+        <PackageReference Include="Microsoft.Testing.Platform" Version="$MicrosoftTestingPlatformVersion$" />
+
+        <!-- Use previous version of all extensions to test forward compatibility -->
+        <PackageReference Include="Microsoft.Testing.Extensions.CrashDump" Version="$PreviousExtensionVersion$" />
+        <PackageReference Include="Microsoft.Testing.Extensions.HangDump" Version="$PreviousExtensionVersion$" />
+        <PackageReference Include="Microsoft.Testing.Extensions.HotReload" Version="$PreviousExtensionVersion$" />
+        <PackageReference Include="Microsoft.Testing.Extensions.Retry" Version="$PreviousExtensionVersion$" />
+        <PackageReference Include="Microsoft.Testing.Extensions.Telemetry" Version="$PreviousExtensionVersion$" />
+        <PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="$PreviousExtensionVersion$" />
+    </ItemGroup>
+</Project>
+
+#file Program.cs
+using Microsoft.Testing.Extensions;
+using Microsoft.Testing.Extensions.TrxReport.Abstractions;
+using Microsoft.Testing.Platform.Builder;
+using Microsoft.Testing.Platform.Capabilities.TestFramework;
+using Microsoft.Testing.Platform.Extensions.Messages;
+using Microsoft.Testing.Platform.Extensions.TestFramework;
+using Microsoft.Testing.Platform.Services;
+
+public class Program
+{
+    public static async Task<int> Main(string[] args)
+    {
+        ITestApplicationBuilder builder = await TestApplication.CreateBuilderAsync(args);
+        builder.RegisterTestFramework(
+            sp => new TestFrameworkCapabilities(new TrxReportCapability()),
+            (_,__) => new DummyTestFramework());
+
+        // Add all extensions to ensure forward compatibility
+        builder.AddCrashDumpProvider();
+        builder.AddHangDumpProvider();
+        builder.AddHotReloadProvider();
+        builder.AddRetryProvider();
+        builder.AddAppInsightsTelemetryProvider();
+        builder.AddTrxReportProvider();
+
+        using ITestApplication app = await builder.BuildAsync();
+        return await app.RunAsync();
+    }
+}
+
+public class TrxReportCapability : ITrxReportCapability
+{
+    bool ITrxReportCapability.IsSupported { get; } = true;
+    void ITrxReportCapability.Enable()
+    {
+    }
+}
+
+public class DummyTestFramework : ITestFramework, IDataProducer
+{
+    public string Uid => nameof(DummyTestFramework);
+
+    public string Version => "2.0.0";
+
+    public string DisplayName => nameof(DummyTestFramework);
+
+    public string Description => nameof(DummyTestFramework);
+
+    public Type[] DataTypesProduced => new[] { typeof(TestNodeUpdateMessage) };
+
+    public Task<bool> IsEnabledAsync() => Task.FromResult(true);
+
+    public Task<CreateTestSessionResult> CreateTestSessionAsync(CreateTestSessionContext context)
+        => Task.FromResult(new CreateTestSessionResult() { IsSuccess = true });
+
+    public Task<CloseTestSessionResult> CloseTestSessionAsync(CloseTestSessionContext context)
+        => Task.FromResult(new CloseTestSessionResult() { IsSuccess = true });
+
+    public async Task ExecuteRequestAsync(ExecuteRequestContext context)
+    {
+        await context.MessageBus.PublishAsync(this, new TestNodeUpdateMessage(context.Request.Session.SessionUid,
+            new TestNode() { Uid = "0", DisplayName = "ForwardCompatibilityTest", Properties = new(PassedTestNodeStateProperty.CachedInstance) }));
+        context.Complete();
+    }
+}
+""";
+
+        public string TargetAssetPath => GetAssetPath(AssetName);
+
+        public override IEnumerable<(string ID, string Name, string Code)> GetAssetsToGenerate()
+        {
+            yield return (AssetName, AssetName,
+                ForwardCompatibilityTestCode
+                .PatchTargetFrameworks(TargetFrameworks.NetCurrent)
+                .PatchCodeWithReplace("$MicrosoftTestingPlatformVersion$", MicrosoftTestingPlatformVersion)
+                .PatchCodeWithReplace("$PreviousExtensionVersion$", PreviousExtensionVersion));
+        }
+    }
+
+    public TestContext TestContext { get; set; }
+}