public static void VerifyAnalyzerEngineIsSafeAgainstExceptions(Func <DiagnosticAnalyzer, IEnumerable <Diagnostic> > runAnalysis, string exceptionDiagnosticId)
{
var handled = new bool?[AllAnalyzerMemberNames.Length];
for (int i = 0; i < AllAnalyzerMemberNames.Length; i++)
{
var member = AllAnalyzerMemberNames[i];
var analyzer = new ThrowingDiagnosticAnalyzer <TLanguageKindEnum>();
analyzer.ThrowOn(member);
try
{
var diagnosticIds = runAnalysis(analyzer).Select(d => d.Id).Distinct();
handled[i] = analyzer.Thrown ? true : (bool?)null;
if (analyzer.Thrown)
{
if (diagnosticIds.Any())
{
Assert.Equal(exceptionDiagnosticId, diagnosticIds.Single());
}
}
else
{
Assert.False(diagnosticIds.Any());
}
}
catch (DeliberateException)
{
handled[i] = false;
}
}
var membersHandled = AllAnalyzerMemberNames.Zip(handled, (m, h) => new { Member = m, Handled = h });
Assert.True(!handled.Any(h => h == false) && handled.Any(h => true), Environment.NewLine +
" Exceptions thrown by analyzers in these members were *NOT* handled:" + Environment.NewLine + string.Join(Environment.NewLine, membersHandled.Where(mh => mh.Handled == false).Select(mh => mh.Member)) + Environment.NewLine + Environment.NewLine +
" Exceptions thrown from these members were handled gracefully:" + Environment.NewLine + string.Join(Environment.NewLine, membersHandled.Where(mh => mh.Handled == true).Select(mh => mh.Member)) + Environment.NewLine + Environment.NewLine +
" These members were not called/accessed by analyzer engine:" + Environment.NewLine + string.Join(Environment.NewLine, membersHandled.Where(mh => mh.Handled == null).Select(mh => mh.Member)));
}