public void TestClassAttribute()
 {
     foreach (var root in roots)
     {
         NamespaceDeclarationSyntax namespaceDeclarationSyntax = (NamespaceDeclarationSyntax)root.Members[0];
         ClassDeclarationSyntax     classDeclarationSyntax     = (ClassDeclarationSyntax)namespaceDeclarationSyntax.Members[0];
         classDeclarationSyntax.AttributeLists.Count.Should().Be(1);
         AttributeListSyntax attributeArgumentSyntax = classDeclarationSyntax.AttributeLists[0];
         attributeArgumentSyntax.ToFullString().Trim().Should().Be("[TestClass]");
     }
 }