Update UsesVerifyGenerator.cs

Author: SimonCropp

src/Verify.MSTest.SourceGenerator/UsesVerifyGenerator.cs

@@ -62,9 +62,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                         return null;
                     }
 
-                    cancel.ThrowIfCancellationRequested();
-
-                    if (!symbol.HasAttributeOfType(TestClassAttributeName, includeDerived: true))
+                    if (HasTestClassAttribute(symbol))
                     {
                         return null;
                     }
@@ -96,6 +94,8 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         context.RegisterSourceOutput(toGenerate, Execute);
     }
 
+    static bool HasTestClassAttribute(INamedTypeSymbol symbol) => !symbol.HasAttributeOfType(TestClassAttributeName, includeDerived: true);
+
     static bool IsSyntaxEligibleForGeneration(SyntaxNode node, Cancel _) =>
         node is ClassDeclarationSyntax;