protected virtual void CheckNSObjectProtocol(NSObject obj)
{
// not documented to allow null, but commonly used this way. OTOH it's not clear what code answer this
// (it might be different implementations) but we can make sure that Apple allows null with this test
// ref: https://bugzilla.xamarin.com/show_bug.cgi?id=35924
var kind_of_null = obj.IsKindOfClass (null);
if (kind_of_null)
ReportError ("{0} : IsKindOfClass(null) failed", instance_type_name);
var is_member_of_null = obj.IsMemberOfClass (null);
if (is_member_of_null)
ReportError ("{0} : IsMemberOfClass(null) failed", instance_type_name);
var respond_to_null = obj.RespondsToSelector (null);
if (respond_to_null)
ReportError ("{0} : RespondToSelector(null) failed", instance_type_name);
var conforms_to_null = obj.ConformsToProtocol (IntPtr.Zero);
if (conforms_to_null)
ReportError ("{0} : ConformsToProtocol(null) failed", instance_type_name);
}
