def test_lower_mixin_abc(self): f = UsernameField() self.assertEqual('abc', f.to_python('ABC'))
def test_lower_mixin_empty(self): f = UsernameField() self.assertEqual('', f.to_python(''))
def test_lower_mixin_none(self): f = UsernameField() self.assertIsNone(f.to_python(None))