def __init__(self, email, resolution=80):
        """
        Creates a new GravatarStorage for a specific avatar and a given
        resolution. The avatar is stored in a temporary file.
        """
        self._email = email
        self._resolution = resolution

        self.prefix = utils.get_avatar_prefix(resolution)
 def test_avatar_prefix(self):
     self.assertEqual(utils.get_avatar_prefix(120), 'avatar/120x120')