'Tests creation of bookmark with display_name None.'

def test_create_bookmark_successfully_with_display_name_none(self):

    bookmark_data = self.get_bookmark_data(self.vertical_4)
    (bookmark, __) = Bookmark.create(bookmark_data)
    bookmark_data['display_name'] = self.vertical_4.display_name_with_default
    self.assert_bookmark_model_is_valid(bookmark, bookmark_data)
