As I've said before Mary Sue tests are as shallow as the people that write them. They test traits, but they do not test reasons (whys and hows) behind the traits.
Test: Your character has purple eyes? Sue.
Writer: But--!
Test: Sue.
Writer: But (character A)'s eyes are like that because (logical reason X, Y and Z).
Test: It's a damn Sue, so STFU bitch!
=D