Test tree:
[root](+)
.test_escape_me(+)
..test_get_facebook_username(+)
...(None-https://facebook_com/)(+)
...(None-https://facebook_com/share_php?http://foo_com/)(+)
...(None-https://facebook_com/home_php)(+)
...(username-https://facebook_com/username)(+)
...(username-https://facebook_com/username/app_123)(+)
