Sorry, just had bad issues with that test...though, I think Laurell K. Hamilton's Anita should take it. I have a feeling Anita would fail...badly. I think one more book and she'll transcend into Demi-goddom.
I deliberately ran Merry Gentry through one of those Mary Sue litmus tests and she got the highest score imaginable. Yiggh. Didn't surprise me in the least, since she's such a horrendous character anyway. I can't help hoping there's some salvagable plot buried in all that smut; the real problem with that series is the fact that the writing is so lazy. A more capable writer, or at least one who doesn't seem to be suffering from creative burnout, could probably make something out of the premise, other than a clothesline to hang sex scenes on.
That said, I believe it is possible to create a character that would, on a cursory inspection, fail to pass a Mary Sue litmus test, and yet be a good, well-developed character, depending on the quality of the author's writing and the care they take while creating that character. I have one character whom I've used in several fanfictions, an RPG and some original fiction, who narrowly passed the test, yet he's a generally well-received character. Sure, he has the cliche tragic past (or TWAGIC PAST!!!!111, in fan-kiddie speak): he was left to die at birth by his mother (a prostitute), was rescued by a poor but generally happy family who later had to give him up to a state-controlled children's home (the setting was a world where only licensed people could have children and unlicensed kids were taken into state custody and farmed out to people who met the licensing requirements, but couldn't have kids of their own for whatever reason), where he was later adopted by a wealthy couple who pretty much treated him like a trophy child -- but the guy pretty much let all that slide off him like water off a duck's back. Unlike Mary Sue (or her male counterpart Gary Stu), he didn't angst over it or try to use it as an excuse for people to pity him. His attitude was, "Yeah, sh** happened to me, but hey, I'm still useful to th' ladies... or th' gents who swing that way."