Make unit tests for DllImportGenerator build/run in CI

src/libraries/System.Runtime.InteropServices/System.Runtime.InteropServices.sln

@@ -19,7 +19,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Interop.Ancillary
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DllImportGenerator.Tests", "tests\DllImportGenerator.Tests\DllImportGenerator.Tests.csproj", "{57A1A6FD-9231-4DFB-8619-F0EDEDA208E3}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DllImportGenerator.UnitTests", "tests\DllImportGenerator.UnitTests\DllImportGenerator.UnitTests.csproj", "{4B516949-4AD4-44D6-AF86-C2E6058608D5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DllImportGenerator.Unit.Tests", "tests\DllImportGenerator.UnitTests\DllImportGenerator.Unit.Tests.csproj", "{4B516949-4AD4-44D6-AF86-C2E6058608D5}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Runtime.InteropServices.ComDisabled.Tests", "tests\System.Runtime.InteropServices.ComDisabled.UnitTests\System.Runtime.InteropServices.ComDisabled.Tests.csproj", "{25D66424-2EAF-464D-8460-10C04EDEF3C3}"
 EndProject

src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/Ancillary.Interop.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <AssemblyName>Microsoft.Interop.Ancillary</AssemblyName>
-    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <TargetFramework>$(NetCoreAppMinimum)</TargetFramework>
     <RootNamespace>System.Runtime.InteropServices</RootNamespace>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportAnalyzerTests.cs

@@ -11,6 +11,7 @@
 
 namespace DllImportGenerator.UnitTests
 {
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/60650", TestRuntimes.Mono)]
     public class ConvertToGeneratedDllImportAnalyzerTests
     {
         public static IEnumerable<object[]> MarshallingRequiredTypes() => new[]

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportFixerTests.cs

@@ -14,6 +14,7 @@
 
 namespace DllImportGenerator.UnitTests
 {
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/60650", TestRuntimes.Mono)]
     public class ConvertToGeneratedDllImportFixerTests
     {
         [Theory]
@@ -29,7 +30,7 @@ partial class Test
     public static extern int [|Method|](out int ret);
 }}";
             // Fixed source will have CS8795 (Partial method must have an implementation) without generator run
-            string fixedSource = usePreprocessorDefines 
+            string fixedSource = usePreprocessorDefines
                 ? @$"
 using System.Runtime.InteropServices;
 partial class Test
@@ -41,7 +42,7 @@ partial class Test
     [DllImport(""DoesNotExist"")]
     public static extern int Method(out int ret);
 #endif
-}}" 
+}}"
                 : @$"
 using System.Runtime.InteropServices;
 partial class Test

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGenerator.UnitTests.csproj → src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGenerator.Unit.Tests.csproj

@@ -8,10 +8,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion)" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="$(MicrosoftCodeAnalysisAnalyzersVersion)" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="$(CompilerPlatformTestingVersion)" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="$(CompilerPlatformTestingVersion)" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion)" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="$(CompilerPlatformTestingVersion)" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="$(CompilerPlatformTestingVersion)" />
     <PackageReference Include="coverlet.collector" Version="$(CoverletCollectorVersion)">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/GeneratedDllImportAnalyzerTests.cs

@@ -9,6 +9,7 @@
 
 namespace DllImportGenerator.UnitTests
 {
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/60650", TestRuntimes.Mono)]
     public class GeneratedDllImportAnalyzerTests
     {
         [Fact]

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ManualTypeMarshallingAnalyzerTests.cs

@@ -12,6 +12,7 @@
 
 namespace DllImportGenerator.UnitTests
 {
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/60650", TestRuntimes.Mono)]
     public class ManualTypeMarshallingAnalyzerTests
     {
         public static IEnumerable<object[]> NonBlittableTypeMarkedBlittable_ReportsDiagnostic_TestData {
@@ -421,7 +422,6 @@ await VerifyCS.VerifyAnalyzerAsync(source,
                 VerifyCS.Diagnostic(GetPinnableReferenceReturnTypeBlittableRule).WithLocation(0));
         }
 
-
         [Fact]
         public async Task BlittableGetPinnableReferenceReturnType_DoesNotReportDiagnostic()
         {
@@ -518,7 +518,7 @@ public Native(S s) : this()
 
             await VerifyCS.VerifyAnalyzerAsync(source);
         }
-    
+
         [Fact]
         public async Task TypeWithGetPinnableReferenceByRefReturnType_ReportsDiagnostic()
         {
@@ -852,7 +852,7 @@ struct Native
 
             await VerifyCS.VerifyAnalyzerAsync(source);
         }
-        
+
         [Fact]
         public async Task NativeTypeWithOnlyStackallocConstructor_ReportsDiagnostic()
         {
@@ -897,7 +897,7 @@ struct {|#1:Native|}
     public Native(S s, Span<byte> buffer) {}
 
     public IntPtr Value => IntPtr.Zero;
-    
+
     public const int StackBufferSize = 0x100;
 }";
 
@@ -953,7 +953,7 @@ struct Native
             await VerifyCS.VerifyAnalyzerAsync(source,
                 VerifyCS.Diagnostic(ValuePropertyMustHaveSetterRule).WithLocation(0).WithArguments("Native"));
         }
-        
+
         [Fact]
         public async Task BlittableNativeTypeOnMarshalUsingParameter_DoesNotReportDiagnostic()
         {
@@ -1142,7 +1142,6 @@ await VerifyCS.VerifyAnalyzerAsync(source,
                 VerifyCS.Diagnostic(NativeTypeMustBeBlittableRule).WithLocation(0).WithArguments("Native", "S"));
         }
 
-
         [Fact]
         public async Task GenericNativeTypeWithValueTypeValueProperty_DoesNotReportDiagnostic()
         {
@@ -1358,7 +1357,6 @@ unsafe struct S
         [Fact]
         public async Task BlittableGenericTypeInBlittableType_DoesNotReportDiagnostic()
         {
-
             var source = @"
 using System.Runtime.InteropServices;
 

src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/TestUtils.cs

@@ -83,7 +83,7 @@ public static async Task<Compilation> CreateCompilation(SyntaxTree[] sources, Ou
 
             return CSharpCompilation.Create("compilation",
                 sources,
-                (await mdRefs.ResolveAsync(LanguageNames.CSharp, CancellationToken.None)).Add(ancillary),
+                (await ResolveReferenceAssemblies(mdRefs)).Add(ancillary),
                 new CSharpCompilationOptions(outputKind, allowUnsafe: allowUnsafe));
         }
 
@@ -112,19 +112,13 @@ public static async Task<Compilation> CreateCompilationWithReferenceAssemblies(S
         {
             return CSharpCompilation.Create("compilation",
                 sources,
-                (await referenceAssemblies.ResolveAsync(LanguageNames.CSharp, CancellationToken.None)),
+                await ResolveReferenceAssemblies(referenceAssemblies),
                 new CSharpCompilationOptions(outputKind, allowUnsafe: allowUnsafe));
         }
 
         public static (ReferenceAssemblies, MetadataReference) GetReferenceAssemblies()
         {
-            // TODO: When .NET 6.0 releases, we can simplify this.
-            var referenceAssemblies = new ReferenceAssemblies(
-                    "net6.0",
-                    new PackageIdentity(
-                        "Microsoft.NETCore.App.Ref",
-                        "6.0.0-preview.7.21377.19"),
-                    Path.Combine("ref", "net6.0"))
+            var referenceAssemblies = ReferenceAssemblies.Net.Net60
                 .WithNuGetConfigFilePath(Path.Combine(Path.GetDirectoryName(typeof(TestUtils).Assembly.Location)!, "NuGet.config"));
 
             // Include the assembly containing the new attribute and all of its references.
@@ -165,5 +159,20 @@ public static GeneratorDriver CreateDriver(Compilation c, AnalyzerConfigOptionsP
                 ImmutableArray.Create(generators.Select(gen => gen.AsSourceGenerator()).ToArray()),
                 parseOptions: (CSharpParseOptions)c.SyntaxTrees.First().Options,
                 optionsProvider: options);
+
+        private static async Task<ImmutableArray<MetadataReference>> ResolveReferenceAssemblies(ReferenceAssemblies referenceAssemblies)
+        {
+            const string envVar = "NUGET_PACKAGES";
+            try
+            {
+                // Set the NuGet package cache location to a subdirectory such that we should always have access to it
+                Environment.SetEnvironmentVariable(envVar, Path.Combine(Path.GetDirectoryName(typeof(TestUtils).Assembly.Location)!, "packages"));
+                return await referenceAssemblies.ResolveAsync(LanguageNames.CSharp, CancellationToken.None);
+            }
+            finally
+            {
+                Environment.SetEnvironmentVariable(envVar, null);
+            }
+        }
     }
 }

src/libraries/tests.proj

@@ -225,6 +225,7 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.WebSockets.Client\tests\wasm\System.Net.WebSockets.Client.Wasm.Tests.csproj" />
 
     <!-- https://github.com/dotnet/runtime/issues/58226 -->
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.InteropServices\tests\DllImportGenerator.UnitTests\DllImportGenerator.Unit.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.Json\tests\System.Text.Json.SourceGeneration.Unit.Tests\System.Text.Json.SourceGeneration.Roslyn3.11.Unit.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.Json\tests\System.Text.Json.SourceGeneration.Unit.Tests\System.Text.Json.SourceGeneration.Roslyn4.0.Unit.Tests.csproj" />