Find token from Xunit.TestContext.Current.CancellationToken

Author: meziantou

src/Meziantou.Analyzer/Rules/UseAnOverloadThatHasCancellationTokenAnalyzer.cs

@@ -92,6 +92,7 @@ private sealed class AnalyzerContext(Compilation compilation)
         private INamedTypeSymbol? TaskOfTSymbol { get; } = compilation.GetBestTypeByMetadataName("System.Threading.Tasks.Task`1");
         private INamedTypeSymbol? ConfiguredCancelableAsyncEnumerableSymbol { get; } = compilation.GetBestTypeByMetadataName("System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable`1");
         private INamedTypeSymbol? EnumeratorCancellationAttributeSymbol { get; } = compilation.GetBestTypeByMetadataName("System.Runtime.CompilerServices.EnumeratorCancellationAttribute");
+        private INamedTypeSymbol? XunitTestContextSymbol { get; } = compilation.GetBestTypeByMetadataName("Xunit.TestContext");
 
         private bool HasExplicitCancellationTokenArgument(IInvocationOperation operation)
         {
@@ -179,7 +180,7 @@ public void AnalyzeInvocation(OperationAnalysisContext context)
                 if (parentMethod is not null && parentMethod.IsOverrideOrInterfaceImplementation())
                     return;
 
-                context.ReportDiagnostic(UseAnOverloadThatHasCancellationTokenRule, CreateProperties(availableCancellationTokens, parameterInfo), operation, string.Join(", ", availableCancellationTokens));
+                context.ReportDiagnostic(UseAnOverloadThatHasCancellationTokenRule, CreateProperties(availableCancellationTokens, parameterInfo), operation);
             }
         }
 
@@ -309,7 +310,9 @@ public void AnalyzeLoop(OperationAnalysisContext context)
 
         private string[] FindCancellationTokens(IOperation operation, CancellationToken cancellationToken)
         {
+
             var availableSymbols = new List<NameAndType>();
+
             foreach (var symbol in operation.LookupAvailableSymbols(cancellationToken))
             {
                 var symbolType = symbol.GetSymbolType();
@@ -319,7 +322,7 @@ private string[] FindCancellationTokens(IOperation operation, CancellationToken
                 availableSymbols.Add(new(symbol.Name, symbolType));
             }
 
-            if (availableSymbols.Count == 0)
+            if (availableSymbols.Count == 0 && XunitTestContextSymbol is null)
                 return [];
 
             var isInStaticContext = operation.IsInStaticContext(cancellationToken);
@@ -348,6 +351,11 @@ private string[] FindCancellationTokens(IOperation operation, CancellationToken
                 }
             }
 
+            if (XunitTestContextSymbol != null)
+            {
+                paths.Add("Xunit.TestContext.Current.CancellationToken");
+            }
+
             if (paths.Count == 0)
                 return [];
 

tests/Meziantou.Analyzer.Test/Helpers/ProjectBuilder.cs

@@ -73,9 +73,16 @@ async Task<string[]> Download()
                 using var stream = await SharedHttpClient.Instance.GetStreamAsync(new Uri($"https://www.nuget.org/api/v2/package/{packageName}/{version}")).ConfigureAwait(false);
                 using var zip = new ZipArchive(stream, ZipArchiveMode.Read);
 
+                var hasEntry = false;
                 foreach (var entry in zip.Entries.Where(file => paths.Any(path => file.FullName.StartsWith(path, StringComparison.Ordinal))))
                 {
                     entry.ExtractToFile(Path.Combine(tempFolder, entry.Name), overwrite: true);
+                    hasEntry = true;
+                }
+
+                if (!hasEntry)
+                {
+                    throw new InvalidOperationException("The NuGet package " + packageName + "@" + version + " does not contain any file matching the paths " + string.Join(", ", paths));
                 }
 
                 try

tests/Meziantou.Analyzer.Test/Rules/UseAnOverloadThatHasCancellationTokenAnalyzerTests.cs

@@ -1228,4 +1228,47 @@ class Sample
               .WithOutputKind(Microsoft.CodeAnalysis.OutputKind.ConsoleApplication)
               .ValidateAsync();
     }
+
+    [Fact]
+    public async Task Xunit2()
+    {
+        await CreateProjectBuilder()
+              .AddNuGetReference("xunit.abstractions", "2.0.3", "lib/netstandard2.0/")
+              .WithSourceCode("""
+                using System.Threading;
+                using System.Threading.Tasks;
+
+                {|MA0032:Sample.Repro()|};
+
+                class Sample
+                {
+                    public static void Repro() => throw null;
+                    public static void Repro(CancellationToken cancellationToken) => throw null;
+                }
+                """)
+              .WithOutputKind(Microsoft.CodeAnalysis.OutputKind.ConsoleApplication)
+              .ValidateAsync();
+    }
+
+    [Fact]
+    public async Task Xunit3()
+    {
+        await CreateProjectBuilder()
+              .AddNuGetReference("xunit.v3.extensibility.core", "1.0.0", "lib/netstandard2.0/")
+              .WithSourceCode("""
+                using System.Threading;
+                using System.Threading.Tasks;
+
+                {|MA0040:Sample.Repro()|};
+
+                class Sample
+                {
+                    public static void Repro() => throw null;
+                    public static void Repro(CancellationToken cancellationToken) => throw null;
+                }
+                """)
+              .WithOutputKind(Microsoft.CodeAnalysis.OutputKind.ConsoleApplication)
+              .ShouldReportDiagnosticWithMessage("Use an overload with a CancellationToken, available tokens: Xunit.TestContext.Current.CancellationToken")
+              .ValidateAsync();
+    }
 }