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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Remote.Testing;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Test.Utilities;
using Roslyn.Test.Utilities.TestGenerators;
using Roslyn.Utilities;
using Xunit;
using static Microsoft.CodeAnalysis.UnitTests.SolutionTestHelpers;
using static Microsoft.CodeAnalysis.UnitTests.SolutionUtilities;
using static Microsoft.CodeAnalysis.UnitTests.WorkspaceTestUtilities;
namespace Microsoft.CodeAnalysis.UnitTests;
[UseExportProvider]
public sealed class SolutionWithSourceGeneratorTests : TestBase
{
[Theory, CombinatorialData]
public async Task SourceGeneratorBasedOnAdditionalFileGeneratesSyntaxTrees(
bool fetchCompilationBeforeAddingAdditionalFile, TestHost testHost)
{
// This test is just the sanity test to make sure generators work at all. There's not a special scenario being
// tested.
var generatedFilesOutputDir = Path.Combine(TempRoot.Root, "gendir");
var assemblyPath = Path.Combine(TempRoot.Root, "assemblyDir", "assembly.dll");
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.WithCompilationOutputInfo(new CompilationOutputInfo(assemblyPath, generatedFilesOutputDir))
.AddAnalyzerReference(analyzerReference);
// Optionally fetch the compilation first, which validates that we handle both running the generator
// when the file already exists, and when it is added incrementally.
Compilation? originalCompilation = null;
if (fetchCompilationBeforeAddingAdditionalFile)
{
originalCompilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
}
project = project.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var newCompilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.NotSame(originalCompilation, newCompilation);
var generatedTree = Assert.Single(newCompilation.SyntaxTrees);
var generatorType = typeof(GenerateFileForEachAdditionalFileWithContentsCommented);
Assert.Equal(Path.Combine(generatedFilesOutputDir, generatorType.Assembly.GetName().Name!, generatorType.FullName!, "Test.generated.cs"), generatedTree.FilePath);
var generatedDocument = Assert.Single(await project.GetSourceGeneratedDocumentsAsync());
Assert.Same(generatedTree, await generatedDocument.GetSyntaxTreeAsync());
}
[Theory, CombinatorialData, WorkItem("https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1655835")]
public async Task WithReferencesMethodCorrectlyUpdatesWithEqualReferences(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
// AnalyzerReferences may implement equality (AnalyezrFileReference does), and we want to make sure if we substitute out one
// reference with another reference that's equal, we correctly update generators. We'll have the underlying generators
// be different since two AnalyzerFileReferences that are value equal but different instances would have their own generators as well.
const string SharedPath = "Z:\\Generator.dll";
static ISourceGenerator CreateGenerator() => new SingleFileTestGenerator("// StaticContent", hintName: "generated");
var analyzerReference1 = new TestGeneratorReferenceWithFilePathEquality(CreateGenerator(), SharedPath);
var analyzerReference2 = new TestGeneratorReferenceWithFilePathEquality(CreateGenerator(), SharedPath);
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference1);
Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
// Go from one analyzer reference to the other
project = project.WithAnalyzerReferences([analyzerReference2]);
Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
// Now remove and confirm that we don't have any files
project = project.WithAnalyzerReferences([]);
Assert.Empty((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
}
private class TestGeneratorReferenceWithFilePathEquality : TestGeneratorReference, IEquatable<AnalyzerReference>
{
public TestGeneratorReferenceWithFilePathEquality(ISourceGenerator generator, string analyzerFilePath)
: base(generator, analyzerFilePath)
{
}
public override bool Equals(object? obj) => Equals(obj as AnalyzerReference);
public override string FullPath => base.FullPath!; // This derived class always has this non-null
public override int GetHashCode() => this.FullPath.GetHashCode();
public bool Equals(AnalyzerReference? other)
{
return other is TestGeneratorReferenceWithFilePathEquality otherReference &&
this.FullPath == otherReference.FullPath;
}
}
[Theory, CombinatorialData]
public async Task WithReferencesMethodCorrectlyAddsAndRemovesRunningGenerators(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
// We always have a single generator in this test, and we add or remove a second one. This is critical
// to ensuring we correctly update our existing GeneratorDriver we may have from a prior run with the new
// generators passed to WithAnalyzerReferences. If we only swap from zero generators to one generator,
// we don't have a prior GeneratorDriver to update, since we don't make a GeneratorDriver if we have no generators.
// Similarly, once we go from one back to zero, we end up getting rid of our GeneratorDriver entirely since
// we have no need for it, as an optimization.
var generatorReferenceToKeep = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent", hintName: "generatorReferenceToKeep"));
var analyzerReferenceToAddAndRemove = new TestGeneratorReference(new SingleFileTestGenerator2("// More Static Content", hintName: "analyzerReferenceToAddAndRemove"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(generatorReferenceToKeep);
Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
// Go from one generator to two.
project = project.WithAnalyzerReferences([generatorReferenceToKeep, analyzerReferenceToAddAndRemove]);
Assert.Equal(2, (await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees.Count());
// And go back to one
project = project.WithAnalyzerReferences([generatorReferenceToKeep]);
Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
}
// We only run this test on Release, as the compiler has asserts that trigger in Debug that the type names probably shouldn't be the same.
[ConditionalTheory(typeof(IsRelease)), CombinatorialData]
public async Task GeneratorAddedWithDifferentFilePathsProducesDistinctDocumentIds(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
// Produce two generator references with different paths, but the same generator by assembly/type. We will still give them separate
// generator instances, because in the "real" analyzer reference case each analyzer reference produces it's own generator objects.
var generatorReference1 = new TestGeneratorReference(new SingleFileTestGenerator("", hintName: "DuplicateFile"), analyzerFilePath: "Z:\\A.dll");
var generatorReference2 = new TestGeneratorReference(new SingleFileTestGenerator("", hintName: "DuplicateFile"), analyzerFilePath: "Z:\\B.dll");
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReferences([generatorReference1, generatorReference2]);
Assert.Equal(2, (await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees.Count());
var generatedDocuments = (await project.GetSourceGeneratedDocumentsAsync()).ToList();
Assert.Equal(2, generatedDocuments.Count);
Assert.NotEqual(generatedDocuments[0].Id, generatedDocuments[1].Id);
}
[Fact]
public async Task IncrementalSourceGeneratorInvokedCorrectNumberOfTimes()
{
using var workspace = CreateWorkspace([typeof(TestCSharpCompilationFactoryServiceWithIncrementalGeneratorTracking)]);
var generator = new GenerateFileForEachAdditionalFileWithContentsCommented();
var analyzerReference = new TestGeneratorReference(generator);
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddAdditionalDocument("Test.txt", "Hello, world!").Project
.AddAdditionalDocument("Test2.txt", "Hello, world!").Project;
var compilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
var generatorDriver = project.Solution.CompilationState.GetTestAccessor().GetGeneratorDriver(project)!;
var runResult = generatorDriver!.GetRunResult().Results[0];
Assert.Equal(2, compilation.SyntaxTrees.Count());
Assert.Equal(2, runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName].Length);
Assert.All(runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName],
step =>
{
Assert.Collection(step.Inputs,
source => Assert.Equal(IncrementalStepRunReason.New, source.Source.Outputs[source.OutputIndex].Reason));
Assert.Collection(step.Outputs,
output => Assert.Equal(IncrementalStepRunReason.New, output.Reason));
});
// Change one of the additional documents, and rerun; we should only reprocess that one change, since this
// is an incremental generator.
project = project.AdditionalDocuments.First().WithAdditionalDocumentText(SourceText.From("Changed text!")).Project;
compilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
generatorDriver = project.Solution.CompilationState.GetTestAccessor().GetGeneratorDriver(project)!;
runResult = generatorDriver.GetRunResult().Results[0];
Assert.Equal(2, compilation.SyntaxTrees.Count());
Assert.Equal(2, runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName].Length);
Assert.Contains(runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName],
step =>
{
return step.Inputs.Length == 1
&& step.Inputs[0].Source.Outputs[step.Inputs[0].OutputIndex].Reason == IncrementalStepRunReason.Modified
&& step.Outputs is [{ Reason: IncrementalStepRunReason.Modified }];
});
Assert.Contains(runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName],
step =>
{
return step.Inputs.Length == 1
&& step.Inputs[0].Source.Outputs[step.Inputs[0].OutputIndex].Reason == IncrementalStepRunReason.Cached
&& step.Outputs is [{ Reason: IncrementalStepRunReason.Cached }];
});
// Change one of the source documents, and rerun; we should again only reprocess that one change.
project = project.AddDocument("Source.cs", SourceText.From("")).Project;
compilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
generatorDriver = project.Solution.CompilationState.GetTestAccessor().GetGeneratorDriver(project)!;
runResult = generatorDriver.GetRunResult().Results[0];
// We have one extra syntax tree now, but it did not require any invocations of the incremental generator.
Assert.Equal(3, compilation.SyntaxTrees.Count());
Assert.Equal(2, runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName].Length);
Assert.All(runResult.TrackedSteps[GenerateFileForEachAdditionalFileWithContentsCommented.StepName],
step =>
{
Assert.Collection(step.Inputs,
source => Assert.Equal(IncrementalStepRunReason.Cached, source.Source.Outputs[source.OutputIndex].Reason));
Assert.Collection(step.Outputs,
output => Assert.Equal(IncrementalStepRunReason.Cached, output.Reason));
});
}
[Theory, CombinatorialData]
public async Task SourceGeneratorContentStillIncludedAfterSourceFileChange(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("Hello.cs", "// Source File").Project
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var documentId = project.DocumentIds.Single();
await AssertCompilationContainsOneRegularAndOneGeneratedFile(project, documentId, "// Hello, world!");
project = project.Solution.WithDocumentText(documentId, SourceText.From("// Changed Source File")).Projects.Single();
await AssertCompilationContainsOneRegularAndOneGeneratedFile(project, documentId, "// Hello, world!");
static async Task AssertCompilationContainsOneRegularAndOneGeneratedFile(Project project, DocumentId documentId, string expectedGeneratedContents)
{
var compilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
var regularDocumentSyntaxTree = await project.GetRequiredDocument(documentId).GetRequiredSyntaxTreeAsync(CancellationToken.None);
Assert.Contains(regularDocumentSyntaxTree, compilation.SyntaxTrees);
var generatedSyntaxTree = Assert.Single(compilation.SyntaxTrees.Where(t => t != regularDocumentSyntaxTree));
Assert.IsType<SourceGeneratedDocument>(project.GetDocument(generatedSyntaxTree));
Assert.Equal(expectedGeneratedContents, generatedSyntaxTree.GetText().ToString());
}
}
// This will make a series of changes to additional files and assert that we correctly update generated output at various times.
// By making this a theory with a bunch of booleans, it tests that we are correctly handling the situation where we queue up multiple changes
// to the Compilation at once.
[Theory, CombinatorialData]
public async Task SourceGeneratorContentChangesAfterAdditionalFileChanges(
bool assertRightAway,
bool assertAfterAdd,
bool assertAfterFirstChange,
bool assertAfterSecondChange,
TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference);
if (assertRightAway)
await AssertCompilationContainsGeneratedFilesAsync(project, expectedGeneratedContents: []);
project = project.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var additionalDocumentId = project.AdditionalDocumentIds.Single();
if (assertAfterAdd)
await AssertCompilationContainsGeneratedFilesAsync(project, "// Hello, world!");
project = project.Solution.WithAdditionalDocumentText(additionalDocumentId, SourceText.From("Hello, everyone!")).Projects.Single();
if (assertAfterFirstChange)
await AssertCompilationContainsGeneratedFilesAsync(project, "// Hello, everyone!");
project = project.Solution.WithAdditionalDocumentText(additionalDocumentId, SourceText.From("Good evening, everyone!")).Projects.Single();
if (assertAfterSecondChange)
await AssertCompilationContainsGeneratedFilesAsync(project, "// Good evening, everyone!");
project = project.RemoveAdditionalDocument(additionalDocumentId);
await AssertCompilationContainsGeneratedFilesAsync(project, expectedGeneratedContents: []);
static async Task AssertCompilationContainsGeneratedFilesAsync(Project project, params string[] expectedGeneratedContents)
{
var compilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
foreach (var tree in compilation.SyntaxTrees)
Assert.IsType<SourceGeneratedDocument>(project.GetDocument(tree));
var texts = compilation.SyntaxTrees.Select(t => t.GetText().ToString());
AssertEx.SetEqual(expectedGeneratedContents, texts);
}
}
[Theory, CombinatorialData]
public async Task PartialCompilationsIncludeGeneratedFilesAfterFullGeneration(TestHost testHost)
{
using var workspace = CreateWorkspaceWithPartialSemantics(testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("Hello.cs", "// Source File").Project
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var fullCompilation = await project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Equal(2, fullCompilation.SyntaxTrees.Count());
var partialProject = project.Documents.Single().WithFrozenPartialSemantics(CancellationToken.None).Project;
Assert.NotSame(partialProject, project);
var partialCompilation = await partialProject.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Same(fullCompilation, partialCompilation);
}
[Theory, CombinatorialData]
public async Task DocumentIdOfGeneratedDocumentsIsStable(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var projectBeforeChange = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var generatedDocumentBeforeChange = Assert.Single(await projectBeforeChange.GetSourceGeneratedDocumentsAsync());
var projectAfterChange =
projectBeforeChange.Solution.WithAdditionalDocumentText(
projectBeforeChange.AdditionalDocumentIds.Single(),
SourceText.From("Hello, world!!!!")).Projects.Single();
var generatedDocumentAfterChange = Assert.Single(await projectAfterChange.GetSourceGeneratedDocumentsAsync());
Assert.NotSame(generatedDocumentBeforeChange, generatedDocumentAfterChange);
Assert.Equal(generatedDocumentBeforeChange.Id, generatedDocumentAfterChange.Id);
}
[Theory, CombinatorialData]
public async Task DocumentIdGuidInDifferentProjectsIsDifferent(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var solutionWithProjects = AddProjectWithReference(workspace.CurrentSolution, analyzerReference);
solutionWithProjects = AddProjectWithReference(solutionWithProjects, analyzerReference);
var projectIds = solutionWithProjects.ProjectIds.ToList();
var generatedDocumentsInFirstProject = await solutionWithProjects.GetRequiredProject(projectIds[0]).GetSourceGeneratedDocumentsAsync();
var generatedDocumentsInSecondProject = await solutionWithProjects.GetRequiredProject(projectIds[1]).GetSourceGeneratedDocumentsAsync();
// A DocumentId consists of a GUID and then the ProjectId it's within. Even if these two documents have the same GUID,
// they'll still be not equal because of the different ProjectIds. However, we'll also assert the GUIDs should be different as well,
// because otherwise things can get confusing. If nothing else, the DocumentId debugger display string shows only the GUID, so you could
// easily confuse them as being the same.
Assert.NotEqual(generatedDocumentsInFirstProject.Single().Id.Id, generatedDocumentsInSecondProject.Single().Id.Id);
static Solution AddProjectWithReference(Solution solution, TestGeneratorReference analyzerReference)
{
var project = AddEmptyProject(solution);
project = project.AddAnalyzerReference(analyzerReference);
project = project.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
return project.Solution;
}
}
[Theory, CombinatorialData]
public async Task CompilationsInCompilationReferencesIncludeGeneratedSourceFiles(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var solution = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddAdditionalDocument("Test.txt", "Hello, world!").Project.Solution;
var projectIdWithGenerator = solution.ProjectIds.Single();
var projectIdWithReference = ProjectId.CreateNewId();
solution = solution.AddProject(projectIdWithReference, "WithReference", "WithReference", LanguageNames.CSharp)
.AddProjectReference(projectIdWithReference, new ProjectReference(projectIdWithGenerator));
var compilationWithReference = await solution.GetRequiredProject(projectIdWithReference).GetRequiredCompilationAsync(CancellationToken.None);
var compilationReference = Assert.IsAssignableFrom<CompilationReference>(Assert.Single(compilationWithReference.References));
var compilationWithGenerator = await solution.GetRequiredProject(projectIdWithGenerator).GetRequiredCompilationAsync(CancellationToken.None);
Assert.NotEmpty(compilationWithGenerator.SyntaxTrees);
Assert.Same(compilationWithGenerator, compilationReference.Compilation);
}
[Theory, CombinatorialData]
public async Task GetDocumentWithGeneratedTreeReturnsGeneratedDocument(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var syntaxTree = Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees);
var generatedDocument = Assert.IsType<SourceGeneratedDocument>(project.GetDocument(syntaxTree));
Assert.Same(syntaxTree, await generatedDocument.GetSyntaxTreeAsync());
}
[Theory, CombinatorialData]
public async Task GetDocumentWithGeneratedTreeForInProgressReturnsGeneratedDocument(TestHost testHost)
{
using var workspace = CreateWorkspaceWithPartialSemantics(testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
// Ensure we've ran generators at least once
await project.GetCompilationAsync();
// Produce an in-progress snapshot
project = project.Documents.Single(d => d.Name == "RegularDocument.cs").WithFrozenPartialSemantics(CancellationToken.None).Project;
// The generated tree should still be there; even if the regular compilation fell away we've now cached the
// generated trees.
var syntaxTree = Assert.Single((await project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees, t => t.FilePath != "RegularDocument.cs");
var generatedDocument = Assert.IsType<SourceGeneratedDocument>(project.GetDocument(syntaxTree));
Assert.Same(syntaxTree, await generatedDocument.GetSyntaxTreeAsync());
}
[Theory, CombinatorialData]
public async Task TreeReusedIfGeneratedFileDoesNotChangeBetweenRuns(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var generatedTreeBeforeChange = await Assert.Single(await project.GetSourceGeneratedDocumentsAsync()).GetSyntaxTreeAsync();
// Mutate the regular document to produce a new compilation
project = project.Documents.Single().WithText(SourceText.From("// Change")).Project;
var generatedTreeAfterChange = await Assert.Single(await project.GetSourceGeneratedDocumentsAsync()).GetSyntaxTreeAsync();
Assert.Same(generatedTreeBeforeChange, generatedTreeAfterChange);
}
[Theory, CombinatorialData]
public async Task TreeNotReusedIfParseOptionsChangeChangeBetweenRuns(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project
.AddAdditionalDocument("Test.txt", "Hello, world!").Project;
var generatedTreeBeforeChange = await Assert.Single(await project.GetSourceGeneratedDocumentsAsync()).GetSyntaxTreeAsync();
// Mutate the parse options to produce a new compilation
Assert.NotEqual(DocumentationMode.Diagnose, project.ParseOptions!.DocumentationMode);
project = project.WithParseOptions(project.ParseOptions.WithDocumentationMode(DocumentationMode.Diagnose));
var generatedTreeAfterChange = await Assert.Single(await project.GetSourceGeneratedDocumentsAsync()).GetSyntaxTreeAsync();
Assert.NotSame(generatedTreeBeforeChange, generatedTreeAfterChange);
Assert.Equal(DocumentationMode.Diagnose, generatedTreeAfterChange!.Options.DocumentationMode);
}
[Theory, CombinatorialData]
public async Task ChangeToDocumentThatDoesNotImpactGeneratedDocumentReusesDeclarationTree(bool generatorProducesTree, TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
// We'll use either a generator that produces a single tree, or no tree, to ensure we efficiently handle both cases
ISourceGenerator generator = generatorProducesTree ? new SingleFileTestGenerator("// StaticContent")
: new CallbackGenerator(onInit: _ => { }, onExecute: _ => { });
var analyzerReference = new TestGeneratorReference(generator);
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project;
// Ensure we already have a compilation created
_ = await project.GetCompilationAsync();
project = await MakeChangesToDocument(project);
var compilationAfterFirstChange = await project.GetRequiredCompilationAsync(CancellationToken.None);
project = await MakeChangesToDocument(project);
var compilationAfterSecondChange = await project.GetRequiredCompilationAsync(CancellationToken.None);
// When we produced compilationAfterSecondChange, what we would ideally like is that compilation was produced by taking
// compilationAfterFirstChange and simply updating the syntax tree that changed, since the generated documents didn't change.
// That allows the compiler to reuse the same declaration tree for the generated file. This is hard to observe directly, but if we reflect
// into the Compilation we can see if the declaration tree is untouched. We won't look at the original compilation, since
// that original one was produced by adding the generated file as the final step, so it's cache won't be reusable, since the
// compiler separates the "most recently changed tree" in the declaration table for efficiency.
var cachedStateAfterFirstChange = GetDeclarationManagerCachedStateForUnchangingTrees(compilationAfterFirstChange);
var cachedStateAfterSecondChange = GetDeclarationManagerCachedStateForUnchangingTrees(compilationAfterSecondChange);
Assert.Same(cachedStateAfterFirstChange, cachedStateAfterSecondChange);
static object GetDeclarationManagerCachedStateForUnchangingTrees(Compilation compilation)
{
var syntaxAndDeclarationsManager = compilation.GetFieldValue("_syntaxAndDeclarations");
var state = syntaxAndDeclarationsManager.GetType().GetMethod("GetLazyState", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)!.Invoke(syntaxAndDeclarationsManager, null);
var declarationTable = state.GetFieldValue("DeclarationTable");
return declarationTable.GetFieldValue("_cache");
}
static async Task<Project> MakeChangesToDocument(Project project)
{
var existingText = await project.Documents.Single().GetTextAsync();
var newText = existingText.WithChanges(new TextChange(new TextSpan(existingText.Length, length: 0), " With Change"));
project = project.Documents.Single().WithText(newText).Project;
return project;
}
}
[Theory, CombinatorialData]
public async Task CompilationNotCreatedByFetchingGeneratedFilesIfNoGeneratorsPresent(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var project = AddEmptyProject(workspace.CurrentSolution);
Assert.Empty(await project.GetSourceGeneratedDocumentsAsync());
// We shouldn't have any compilation since we didn't have to run anything
Assert.False(project.TryGetCompilation(out _));
}
[Theory, CombinatorialData]
public async Task OpenSourceGeneratedUpdatedToBufferContentsWhenCallingGetOpenDocumentInCurrentContextWithChanges(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference);
Assert.True(workspace.SetCurrentSolution(_ => project.Solution, WorkspaceChangeKind.SolutionChanged));
var generatedDocument = Assert.Single(await project.GetSourceGeneratedDocumentsAsync());
var differentOpenTextContainer = SourceText.From("// Open Text").Container;
workspace.OnSourceGeneratedDocumentOpened(differentOpenTextContainer, generatedDocument);
generatedDocument = Assert.IsType<SourceGeneratedDocument>(differentOpenTextContainer.CurrentText.GetOpenDocumentInCurrentContextWithChanges());
Assert.Same(differentOpenTextContainer.CurrentText, await generatedDocument.GetTextAsync());
Assert.NotSame(workspace.CurrentSolution, generatedDocument.Project.Solution);
var generatedTree = await generatedDocument.GetSyntaxTreeAsync();
var compilation = await generatedDocument.Project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Contains(generatedTree, compilation.SyntaxTrees);
}
[Theory, CombinatorialData]
public async Task OpenSourceGeneratedFileDoesNotCreateNewSnapshotIfContentsKnownToMatch(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference);
Assert.True(workspace.SetCurrentSolution(_ => project.Solution, WorkspaceChangeKind.SolutionChanged));
var generatedDocument = Assert.Single(await workspace.CurrentSolution.Projects.Single().GetSourceGeneratedDocumentsAsync());
var differentOpenTextContainer = SourceText.From("// StaticContent", Encoding.UTF8).Container;
workspace.OnSourceGeneratedDocumentOpened(differentOpenTextContainer, generatedDocument);
generatedDocument = Assert.IsType<SourceGeneratedDocument>(differentOpenTextContainer.CurrentText.GetOpenDocumentInCurrentContextWithChanges());
Assert.Same(workspace.CurrentSolution, generatedDocument!.Project.Solution);
}
[Theory, CombinatorialData]
public async Task OpenSourceGeneratedFileMatchesBufferContentsEvenIfGeneratedFileIsMissingIsRemoved(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new GenerateFileForEachAdditionalFileWithContentsCommented());
var originalAdditionalFile = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddAdditionalDocument("Test.txt", SourceText.From(""));
Assert.True(workspace.SetCurrentSolution(_ => originalAdditionalFile.Project.Solution, WorkspaceChangeKind.SolutionChanged));
var generatedDocument = Assert.Single(await originalAdditionalFile.Project.GetSourceGeneratedDocumentsAsync());
var differentOpenTextContainer = SourceText.From("// Open Text").Container;
workspace.OnSourceGeneratedDocumentOpened(differentOpenTextContainer, generatedDocument);
workspace.OnAdditionalDocumentRemoved(originalAdditionalFile.Id);
// At this point there should be no generated documents, even though our file is still open
Assert.Empty(await workspace.CurrentSolution.Projects.Single().GetSourceGeneratedDocumentsAsync());
generatedDocument = Assert.IsType<SourceGeneratedDocument>(differentOpenTextContainer.CurrentText.GetOpenDocumentInCurrentContextWithChanges());
Assert.Same(differentOpenTextContainer.CurrentText, await generatedDocument.GetTextAsync());
var generatedTree = await generatedDocument.GetSyntaxTreeAsync();
var compilation = await generatedDocument.Project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Contains(generatedTree, compilation.SyntaxTrees);
}
[Theory, CombinatorialData]
public async Task OpenSourceGeneratedDocumentUpdatedAndVisibleInProjectReference(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var solution = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference).Solution;
var projectIdWithGenerator = solution.ProjectIds.Single();
solution = AddEmptyProject(solution).AddProjectReference(
new ProjectReference(projectIdWithGenerator)).Solution;
Assert.True(workspace.SetCurrentSolution(_ => solution, WorkspaceChangeKind.SolutionChanged));
var generatedDocument = Assert.Single(await workspace.CurrentSolution.GetRequiredProject(projectIdWithGenerator).GetSourceGeneratedDocumentsAsync());
var differentOpenTextContainer = SourceText.From("// Open Text").Container;
workspace.OnSourceGeneratedDocumentOpened(differentOpenTextContainer, generatedDocument);
generatedDocument = Assert.IsType<SourceGeneratedDocument>(differentOpenTextContainer.CurrentText.GetOpenDocumentInCurrentContextWithChanges());
var generatedTree = await generatedDocument.GetSyntaxTreeAsync();
// Fetch the compilation from the other project, it should have a compilation reference that
// contains the generated tree
var projectWithReference = generatedDocument.Project.Solution.Projects.Single(p => p.Id != projectIdWithGenerator);
var compilationWithReference = await projectWithReference.GetRequiredCompilationAsync(CancellationToken.None);
var compilationReference = Assert.Single(compilationWithReference.References.OfType<CompilationReference>());
Assert.Contains(generatedTree, compilationReference.Compilation.SyntaxTrees);
}
[Theory, CombinatorialData]
public async Task OpenSourceGeneratedDocumentsUpdateIsDocumentOpenAndCloseWorks(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(new SingleFileTestGenerator("// StaticContent"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference);
Assert.True(workspace.SetCurrentSolution(_ => project.Solution, WorkspaceChangeKind.SolutionChanged));
var generatedDocument = Assert.Single(await project.GetSourceGeneratedDocumentsAsync());
var differentOpenTextContainer = SourceText.From("// Open Text").Container;
workspace.OnSourceGeneratedDocumentOpened(differentOpenTextContainer, generatedDocument);
Assert.True(workspace.IsDocumentOpen(generatedDocument.Identity.DocumentId));
var document = await workspace.CurrentSolution.GetSourceGeneratedDocumentAsync(generatedDocument.Identity.DocumentId, CancellationToken.None);
Contract.ThrowIfNull(document);
workspace.OnSourceGeneratedDocumentClosed(document);
Assert.False(workspace.IsDocumentOpen(generatedDocument.Identity.DocumentId));
Assert.Null(differentOpenTextContainer.CurrentText.GetOpenDocumentInCurrentContextWithChanges());
}
[Theory, CombinatorialData]
public async Task FreezingSolutionEnsuresGeneratorsDoNotRun(bool forkBeforeFreeze, TestHost testHost)
{
var generatorRan = false;
var generator = new CallbackGenerator(onInit: _ => { }, onExecute: _ => { generatorRan = true; });
using var workspace = CreateWorkspaceWithPartialSemantics(testHost);
var analyzerReference = new TestGeneratorReference(generator);
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project;
Assert.True(workspace.SetCurrentSolution(_ => project.Solution, WorkspaceChangeKind.SolutionChanged));
var documentToFreeze = workspace.CurrentSolution.Projects.Single().Documents.Single();
// The generator shouldn't have ran before any of this since we didn't do anything that would ask for a compilation
Assert.False(generatorRan);
if (forkBeforeFreeze)
{
// Forking before freezing means we'll have to do extra work to produce the final compilation, but we should still
// not be running generators
documentToFreeze = documentToFreeze.WithText(SourceText.From("// Changed Source File"));
}
var frozenDocument = documentToFreeze.WithFrozenPartialSemantics(CancellationToken.None);
Assert.NotSame(frozenDocument, documentToFreeze);
await frozenDocument.GetSemanticModelAsync(CancellationToken.None);
Assert.False(generatorRan);
}
[Theory, CombinatorialData, WorkItem("https://github.com/dotnet/roslyn/issues/56702")]
public async Task ForkAfterFreezeNoLongerRunsGenerators(TestHost testHost)
{
using var workspace = CreateWorkspaceWithPartialSemantics(testHost);
var generatorRan = false;
var analyzerReference = new TestGeneratorReference(new CallbackGenerator(_ => { }, onExecute: _ => { generatorRan = true; }, source: "// Hello World!"));
var project = AddEmptyProject(workspace.CurrentSolution)
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs").Project;
// Ensure generators are ran
var objectReference = await project.GetCompilationAsync();
Assert.True(generatorRan);
generatorRan = false;
var document = project.Documents.Single().WithFrozenPartialSemantics(CancellationToken.None);
// And fork with new contents; we'll ensure the contents of this tree are different, but the generator will still not be ran
document = document.WithText(SourceText.From("// Something else"));
var compilation = await document.Project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Equal(2, compilation.SyntaxTrees.Count());
Assert.False(generatorRan);
Assert.Equal("// Something else", (await document.GetRequiredSyntaxRootAsync(CancellationToken.None)).ToFullString());
}
[Theory, CombinatorialData]
public async Task LinkedDocumentOfFrozenShouldNotRunSourceGenerator(TestHost testHost)
{
using var workspace = CreateWorkspaceWithPartialSemantics(testHost);
var generatorRan = false;
var analyzerReference = new TestGeneratorReference(new CallbackGenerator(_ => { }, onExecute: _ => { generatorRan = true; }, source: "// Hello World!"));
var originalDocument1 = AddEmptyProject(workspace.CurrentSolution, name: "Project1")
.AddAnalyzerReference(analyzerReference)
.AddDocument("RegularDocument.cs", "// Source File", filePath: "RegularDocument.cs");
// this is a linked document of document1 above
var originalDocument2 = AddEmptyProject(originalDocument1.Project.Solution, name: "Project2")
.AddAnalyzerReference(analyzerReference)
.AddDocument(originalDocument1.Name, await originalDocument1.GetTextAsync().ConfigureAwait(false), filePath: originalDocument1.FilePath);
var frozenSolution = originalDocument2.WithFrozenPartialSemantics(CancellationToken.None).Project.Solution;
var documentIdsToTest = new[] { originalDocument1.Id, originalDocument2.Id };
foreach (var documentIdToTest in documentIdsToTest)
{
var document = frozenSolution.GetRequiredDocument(documentIdToTest);
Assert.Single(document.GetLinkedDocumentIds());
Assert.Equal(document.GetLinkedDocumentIds().Single(), documentIdsToTest.Except([documentIdToTest]).Single());
document = document.WithText(SourceText.From("// Something else"));
var compilation = await document.Project.GetRequiredCompilationAsync(CancellationToken.None);
Assert.Single(compilation.SyntaxTrees);
Assert.False(generatorRan);
}
}
[Theory, CombinatorialData]
public async Task DynamicFilesNotPassedToSourceGenerators(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
bool? noTreesPassed = null;
var analyzerReference = new TestGeneratorReference(
new CallbackGenerator(
onInit: _ => { },
onExecute: context => noTreesPassed = context.Compilation.SyntaxTrees.Any()));
var project = AddEmptyProject(workspace.CurrentSolution);
var documentInfo = DocumentInfo.Create(
DocumentId.CreateNewId(project.Id),
name: "Test.cs",
isGenerated: true).WithDesignTimeOnly(true);
project = project.Solution.AddDocument(documentInfo).Projects.Single()
.AddAnalyzerReference(analyzerReference);
_ = await project.GetCompilationAsync();
// We should have ran the generator, and it should not have had any trees
Assert.True(noTreesPassed.HasValue);
Assert.False(noTreesPassed!.Value);
}
[Theory, CombinatorialData]
public async Task FreezingSourceGeneratedDocumentsWorks(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(
new SingleFileTestGenerator("// Hello, World"));
var project = AddEmptyProject(workspace.CurrentSolution).AddAnalyzerReference(analyzerReference);
var sourceGeneratedDocument = Assert.Single(await project.GetSourceGeneratedDocumentsAsync());
var sourceGeneratedDocumentIdentity = sourceGeneratedDocument.Identity;
// Do some assertions with freezing that document
await AssertFrozen(project, sourceGeneratedDocumentIdentity);
// Now remove the generator, and ensure we can freeze it even if it's not there. This scenario exists for IDEs where
// a text buffer might still be wired up to the workspace and we're invoking a feature on it. The generated document might have gone
// away, but we don't know that synchronously.
project = project.RemoveAnalyzerReference(analyzerReference);
await AssertFrozen(project, sourceGeneratedDocumentIdentity);
static async Task AssertFrozen(Project project, SourceGeneratedDocumentIdentity identity)
{
var frozenWithSingleDocument = project.Solution.WithFrozenSourceGeneratedDocument(
identity, DateTime.Now, SourceText.From("// Frozen Document"));
Assert.Equal("// Frozen Document", (await frozenWithSingleDocument.GetTextAsync()).ToString());
var syntaxTrees = (await frozenWithSingleDocument.Project.GetRequiredCompilationAsync(CancellationToken.None)).SyntaxTrees;
var frozenTree = Assert.Single(syntaxTrees);
Assert.Equal("// Frozen Document", frozenTree.ToString());
}
}
[Theory, CombinatorialData]
public async Task FreezingSourceGeneratedDocumentsInTwoProjectsWorks(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(
new SingleFileTestGenerator("// Hello, World"));
var solution = AddEmptyProject(workspace.CurrentSolution).AddAnalyzerReference(analyzerReference).Solution;
var projectId1 = solution.ProjectIds.Single();
var project2 = AddEmptyProject(solution, name: "TestProject2").AddAnalyzerReference(analyzerReference);
solution = project2.Solution;
var projectId2 = project2.Id;
var sourceGeneratedDocument1 = Assert.Single(await solution.GetRequiredProject(projectId1).GetSourceGeneratedDocumentsAsync());
var sourceGeneratedDocument2 = Assert.Single(await solution.GetRequiredProject(projectId2).GetSourceGeneratedDocumentsAsync());
// And now freeze both of them at once
var solutionWithFrozenDocuments = solution.WithFrozenSourceGeneratedDocuments(
[(sourceGeneratedDocument1.Identity, DateTime.Now, SourceText.From("// Frozen 1")), (sourceGeneratedDocument2.Identity, DateTime.Now, SourceText.From("// Frozen 2"))]);
Assert.Equal("// Frozen 1", (await (await solutionWithFrozenDocuments.GetRequiredProject(projectId1).GetSourceGeneratedDocumentsAsync()).Single().GetTextAsync()).ToString());
Assert.Equal("// Frozen 2", (await (await solutionWithFrozenDocuments.GetRequiredProject(projectId2).GetSourceGeneratedDocumentsAsync()).Single().GetTextAsync()).ToString());
}
[Theory, CombinatorialData]
public async Task FreezingWithSameContentDoesNotFork(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference = new TestGeneratorReference(
new SingleFileTestGenerator("// Hello, World"));
var project = AddEmptyProject(workspace.CurrentSolution).AddAnalyzerReference(analyzerReference);
var sourceGeneratedDocument = Assert.Single(await project.GetSourceGeneratedDocumentsAsync());
var sourceGeneratedDocumentIdentity = sourceGeneratedDocument.Identity;
var frozenSolution = project.Solution.WithFrozenSourceGeneratedDocument(
sourceGeneratedDocumentIdentity, sourceGeneratedDocument.GenerationDateTime, SourceText.From("// Hello, World"));
Assert.Same(project.Solution, frozenSolution.Project.Solution);
}
[Theory, CombinatorialData]
public async Task TestChangingGeneratorChangesChecksum(TestHost testHost)
{
using var workspace = CreateWorkspace(testHost: testHost);
var analyzerReference1 = new TestGeneratorReference(
new SingleFileTestGenerator("// Hello, World 1"));
var analyzerReference2 = new TestGeneratorReference(
new SingleFileTestGenerator("// Hello, World 2"));
var project0 = AddEmptyProject(workspace.CurrentSolution);
var checksum0 = await project0.Solution.SolutionState.GetChecksumAsync(CancellationToken.None);
var project1 = project0.AddAnalyzerReference(analyzerReference1);
var checksum1 = await project1.Solution.SolutionState.GetChecksumAsync(CancellationToken.None);
Assert.NotEqual(project0, project1);
Assert.NotEqual(checksum0, checksum1);
var project2 = project1.RemoveAnalyzerReference(analyzerReference1);
var checksum2 = await project2.Solution.SolutionState.GetChecksumAsync(CancellationToken.None);
Assert.NotEqual(project0, project2);
Assert.NotEqual(project1, project2);
// Should still have the same checksum that we started with, even though we have different project instances.
Assert.Equal(checksum0, checksum2);
Assert.NotEqual(checksum1, checksum2);
var project3 = project2.AddAnalyzerReference(analyzerReference2);
var checksum3 = await project3.Solution.SolutionState.GetChecksumAsync(CancellationToken.None);
Assert.NotEqual(project0, project3);
Assert.NotEqual(project1, project3);
Assert.NotEqual(project2, project3);
Assert.NotEqual(checksum0, checksum3);
Assert.NotEqual(checksum1, checksum3);
Assert.NotEqual(checksum2, checksum3);
}
#if NET
private sealed class DoNotLoadAssemblyLoader : IAnalyzerAssemblyLoader
{
public static readonly IAnalyzerAssemblyLoader Instance = new DoNotLoadAssemblyLoader();
public void AddDependencyLocation(string fullPath)
{
}
public Assembly LoadFromPath(string fullPath)
=> throw new InvalidOperationException("These tests should not be loading analyzer assemblies in those host workspace, only in the remote one.");
}
[Fact]
public async Task UpdatingAnalyzerReferenceReloadsGenerators()
{
// We have two versions of the same source generator attached to this project as a resource. Each creates a
// 'HelloWorld' class, just with a different string it emits inside.
const string AnalyzerResourceV1 = @"Microsoft.CodeAnalysis.UnitTests.Resources.Microsoft.CodeAnalysis.TestAnalyzerReference.dll.v1";
const string AnalyzerResourceV2 = @"Microsoft.CodeAnalysis.UnitTests.Resources.Microsoft.CodeAnalysis.TestAnalyzerReference.dll.v2";
using var workspace = CreateWorkspace(testHost: TestHost.OutOfProcess);
var solution = workspace.CurrentSolution;
var project1 = solution.AddProject("P1", "P1", LanguageNames.CSharp);
using var tempRoot = new TempRoot();
var tempDirectory = tempRoot.CreateDirectory();
var analyzerPath = Path.Combine(tempDirectory.Path, "Microsoft.CodeAnalysis.TestAnalyzerReference.dll");
var analyzerAssemblyLoaderProvider = workspace.Services.GetRequiredService<IAnalyzerAssemblyLoaderProvider>();
// Add and test the v1 generator first.
{
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(AnalyzerResourceV1))
using (var destination = File.OpenWrite(analyzerPath))
{
stream!.CopyTo(destination);
}
// Pass in an always throwing assembly loader so we can be sure that no loading happens on the host side.
project1 = project1.WithAnalyzerReferences([new AnalyzerFileReference(analyzerPath, DoNotLoadAssemblyLoader.Instance)]);
var generatedDocuments = await project1.GetSourceGeneratedDocumentsAsync();
var helloWorldDoc = generatedDocuments.Single(d => d.Name == "HelloWorld.cs");
var contents = await helloWorldDoc.GetTextAsync();
Assert.True(contents.ToString().Contains("Hello, World 1!"));
}
// Now, overwrite the analyzer reference with a new version that generates different contents
{
using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(AnalyzerResourceV2))
using (var destination = File.OpenWrite(analyzerPath))
{
stream!.CopyTo(destination);
}
// Make a new analyzer reference to that location (note: with the same throwing assembly loader). on the
// host side, this will simply instantiate a new reference. But this will cause all the machinery to run
// syncing this new reference to the oop side, which will load the analyzer reference in a dedicated ALC.
project1 = project1.WithAnalyzerReferences([new AnalyzerFileReference(analyzerPath, DoNotLoadAssemblyLoader.Instance)]);
var generatedDocuments = await project1.GetSourceGeneratedDocumentsAsync();
var helloWorldDoc = generatedDocuments.Single(d => d.Name == "HelloWorld.cs");
// Note that the contents are now different than what we saw before. This is with an analyzer at the same path,
// with the same assembly name and type name for the generator. Because there is a dedicated ALC, this reloads
// fine.
var contents = await helloWorldDoc.GetTextAsync();
Assert.True(contents.ToString().Contains("Hello, World 2!"));
}
}
#endif
}
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