I try to submit a WordPress child theme for Twenty Ten into the Free Themes Directory. I stuck now to get avatar support for theme, but I do not use any template files in the child theme, only styles. css and functions.php.
Also to test the child theme via theme unit tests is in such a case a little bit tricky, because this ends more up to a parent theme test (twenty ten).
I am a little bit puzzled how to get along with it.
WordPress Child Theme for Twenty Ten: Accessible 1.0