private static TestSource ReadTestSource([CallerMemberName] string testMethod = "") =>
 MvcTestSource.Read(nameof(TagHelpersInCodeBlocksAnalyzerTest), testMethod);
 private TestSource ReadSource(string fileName)
 {
     return(MvcTestSource.Read(nameof(StartupAnalyzerTest), fileName));
 }
 private static TestSource ReadTestSource([CallerMemberName] string testMethod = "") =>
 MvcTestSource.Read(nameof(AvoidHtmlPartialAnalyzerTest), testMethod);