Add MSTest reflection source generator (issue #1837)

.github/copilot-instructions.md

@@ -8,7 +8,7 @@ The codebase ships several distinct (but related) products. Knowing which produc
 
 - `src/Platform/Microsoft.Testing.Platform` — Microsoft.Testing.Platform (MTP), a lightweight, in-process test host that replaces VSTest. Most other folders under `src/Platform/` are MTP extensions (`TrxReport`, `CrashDump`, `HangDump`, `HotReload`, `Retry`, `Telemetry`, `HtmlReport`, `AzureDevOpsReport`, `MSBuild`, `VSTestBridge`, …).
 - `src/TestFramework` — MSTest itself: the public `Microsoft.VisualStudio.TestTools.UnitTesting` API (attributes, `Assert`, `TestContext`, …) plus `TestFramework.Extensions`.
-- `src/Adapter` — bridges MSTest to test hosts: `MSTest.TestAdapter` (VSTest adapter), `MSTestAdapter.PlatformServices` (platform-services abstraction shared by both hosts), and `MSTest.Engine` (MTP-native execution engine used by source-generated tests).
+- `src/Adapter` — bridges MSTest to test hosts: `MSTest.TestAdapter` (VSTest adapter) and `MSTestAdapter.PlatformServices` (platform-services abstraction shared by both hosts).
 - `src/Analyzers` — Roslyn analyzers and code fixes shipped as `MSTest.Analyzers`.
 - `src/Package/MSTest.Sdk` — the MSBuild project SDK that wires the pieces together for consumers.
 - `test/UnitTests/<Project>.UnitTests` — fast unit tests for each project.

.github/workflows/add-tests.md

@@ -68,7 +68,6 @@ Analyze the pull request diff to identify source files that were added or modifi
    - `src/TestFramework/` → `test/UnitTests/TestFramework.UnitTests/`
    - `src/Adapter/MSTest.TestAdapter/` → `test/UnitTests/MSTestAdapter.UnitTests/`
    - `src/Adapter/MSTestAdapter.PlatformServices/` → `test/UnitTests/MSTestAdapter.PlatformServices.UnitTests/`
-   - `src/Adapter/MSTest.Engine/` → `test/UnitTests/MSTest.Engine.UnitTests/`
    - `src/Analyzers/MSTest.Analyzers/` → `test/UnitTests/MSTest.Analyzers.Tests/` (if exists)
    - `src/Analyzers/MSTest.SourceGeneration/` → `test/UnitTests/MSTest.SourceGeneration.UnitTests/`
    - `src/Platform/` → `test/UnitTests/` (find matching test project by name)

Directory.Build.props

@@ -50,12 +50,12 @@
 
   <!-- Versioning -->
   <PropertyGroup>
-    <MSTestEnginePreReleaseVersionLabel>alpha</MSTestEnginePreReleaseVersionLabel>
+    <MSTestSourceGenerationPreReleaseVersionLabel>alpha</MSTestSourceGenerationPreReleaseVersionLabel>
 
     <!--
       This is a early preview package, keep 2.0.0-alpha or similar suffix even in official builds.
     -->
-    <MSTestEngineVersionPrefix>2.0.0</MSTestEngineVersionPrefix>
+    <MSTestSourceGenerationVersionPrefix>2.0.0</MSTestSourceGenerationVersionPrefix>
   </PropertyGroup>
 
   <!-- Pack config -->

MSTest.slnf

@@ -6,7 +6,6 @@
       "samples\\FxExtensibility\\FxExtensibility.csproj",
       "samples\\NUnitPlayground\\NUnitPlayground.csproj",
       "samples\\Playground\\Playground.csproj",
-      "src\\Adapter\\MSTest.Engine\\MSTest.Engine.csproj",
       "src\\Adapter\\MSTest.TestAdapter\\MSTest.TestAdapter.csproj",
       "src\\Adapter\\MSTestAdapter.PlatformServices\\MSTestAdapter.PlatformServices.csproj",
       "src\\Analyzers\\MSTest.Analyzers.CodeFixes\\MSTest.Analyzers.CodeFixes.csproj",

NonWindowsTests.slnf

@@ -2,7 +2,6 @@
   "solution": {
     "path": "TestFx.slnx",
     "projects": [
-      "src\\Adapter\\MSTest.Engine\\MSTest.Engine.csproj",
       "src\\Adapter\\MSTest.TestAdapter\\MSTest.TestAdapter.csproj",
       "src\\Adapter\\MSTestAdapter.PlatformServices\\MSTestAdapter.PlatformServices.csproj",
       "src\\Analyzers\\MSTest.Analyzers.CodeFixes\\MSTest.Analyzers.CodeFixes.csproj",

TestFx.slnx

@@ -55,7 +55,6 @@
     <Project Path="src/Platform/Microsoft.Testing.Platform/Microsoft.Testing.Platform.csproj" />
   </Folder>
   <Folder Name="/src/2 - Adapter/">
-    <Project Path="src/Adapter/MSTest.Engine/MSTest.Engine.csproj" />
     <Project Path="src/Adapter/MSTest.TestAdapter/MSTest.TestAdapter.csproj" />
     <Project Path="src/Adapter/MSTestAdapter.PlatformServices/MSTestAdapter.PlatformServices.csproj" />
   </Folder>
@@ -133,7 +132,6 @@
     <Project Path="test/UnitTests/Microsoft.Testing.Platform.MSBuild.UnitTests/Microsoft.Testing.Platform.MSBuild.UnitTests.csproj" />
     <Project Path="test/UnitTests/Microsoft.Testing.Platform.UnitTests/Microsoft.Testing.Platform.UnitTests.csproj" />
     <Project Path="test/UnitTests/MSTest.Analyzers.UnitTests/MSTest.Analyzers.UnitTests.csproj" />
-    <Project Path="test/UnitTests/MSTest.Engine.UnitTests/MSTest.Engine.UnitTests.csproj" />
     <Project Path="test/UnitTests/MSTest.SelfRealExamples.UnitTests/MSTest.SelfRealExamples.UnitTests.csproj" />
     <Project Path="test/UnitTests/MSTest.SourceGeneration.UnitTests/MSTest.SourceGeneration.UnitTests.csproj" />
     <Project Path="test/UnitTests/MSTestAdapter.PlatformServices.UnitTests/MSTestAdapter.PlatformServices.UnitTests.csproj" />

samples/public/DemoMSTestSdk/ProjectWithNativeAOT/ProjectWithNativeAOT.csproj

@@ -36,8 +36,8 @@ Below is the equivalent project configuration when not using MSTest.Sdk
     <PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="$(TestingPlatformVersion)" />
     <PackageReference Include="Microsoft.Testing.Platform.MSBuild" Version="$(TestingPlatformVersion)" />
     <PackageReference Include="MSTest.Analyzers" Version="$(MSTestVersion)" />
-    <PackageReference Include="MSTest.Engine" Version="$(MSTestAOTVersion)" />
     <PackageReference Include="MSTest.SourceGeneration" Version="$(MSTestAOTVersion)" />
+    <PackageReference Include="MSTest.TestAdapter" Version="$(MSTestVersion)" />
     <PackageReference Include="MSTest.TestFramework" Version="$(MSTestVersion)" />
   </ItemGroup>
 

samples/public/mstest-runner/NativeAotRunner/TestProject1/TestProject1.csproj

@@ -11,18 +11,17 @@
 
   <ItemGroup>
     <!--
-      Experimental MSTest Engine & source generator,
-      close sourced, licensed the same as our extensions
-      with Microsoft Testing Platform Tools license.
+      MSTest source generator for Native AOT support. Emits reflection-free metadata
+      that MSTest consumes at runtime through the source-generation hook.
     -->
-    <PackageReference Include="MSTest.Engine" Version="$(MSTestAOTVersion)" />
     <PackageReference Include="MSTest.SourceGeneration" Version="$(MSTestAOTVersion)" />
 
     <PackageReference Include="Microsoft.CodeCoverage.MSBuild" Version="$(CodeCoverageVersion)" />
     <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="$(CodeCoverageVersion)" />
 
     <PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="$(TestingPlatformVersion)" />
     <PackageReference Include="Microsoft.Testing.Platform.MSBuild" Version="$(TestingPlatformVersion)" />
+    <PackageReference Include="MSTest.TestAdapter" Version="$(MSTestVersion)" />
     <PackageReference Include="MSTest.TestFramework" Version="$(MSTestVersion)" />
     <PackageReference Include="MSTest.Analyzers" Version="$(MSTestVersion)">
       <PrivateAssets>all</PrivateAssets>