private static void TestDescriptorIsExceptionSafeCore(DiagnosticDescriptor descriptor)
{
var localizableTitle = descriptor.Title;
var localizableMessage = descriptor.MessageFormat;
var localizableDescription = descriptor.Description;
// Verify exceptions from LocalizableResourceString don't go unhandled.
var title = localizableTitle.ToString();
var message = localizableMessage.ToString();
var description = localizableDescription.ToString();
// Verify exceptions from LocalizableResourceString are raised if OnException is set.
var exceptions = new List <Exception>();
var handler = new EventHandler <Exception>((sender, ex) => exceptions.Add(ex));
localizableTitle.OnException += handler;
localizableMessage.OnException += handler;
localizableDescription.OnException += handler;
// Access and evaluate localizable fields.
var unused1 = localizableTitle.ToString();
var unused2 = localizableMessage.ToString();
var unused3 = localizableDescription.ToString();
Assert.Equal(3, exceptions.Count);
// Verify DiagnosticAnalyzer.SupportedDiagnostics is also exception safe.
var analyzer = new MyAnalyzer(descriptor);
var exceptionDiagnostics = new List <Diagnostic>();
Action <Exception, DiagnosticAnalyzer, Diagnostic> onAnalyzerException = (ex, a, diag) =>
exceptionDiagnostics.Add(diag);
var analyzerManager = new AnalyzerManager(analyzer);
var analyzerExecutor = AnalyzerExecutor.CreateForSupportedDiagnostics(
onAnalyzerException,
analyzerManager
);
var descriptors = analyzerManager.GetSupportedDiagnosticDescriptors(
analyzer,
analyzerExecutor
);
Assert.Equal(1, descriptors.Length);
Assert.Equal(descriptor.Id, descriptors[0].Id);
// Access and evaluate localizable fields.
unused1 = descriptors[0].Title.ToString();
unused2 = descriptors[0].MessageFormat.ToString();
unused3 = descriptors[0].Description.ToString();
// Verify logged analyzer exception diagnostics.
Assert.Equal(3, exceptionDiagnostics.Count);
Assert.True(
exceptionDiagnostics.TrueForAll(AnalyzerExecutor.IsAnalyzerExceptionDiagnostic)
);
}
