def test_word_in(self):
        """ test the use of the `in` operator """
        self.assertTrue('key' in spell.word_freq_dict)
        self.assertFalse('wantthis' in spell.word_freq_dict)  # a known excluded word
        self.assertEqual(spell.word_freq_dict.get('a', 0), 48779620)
 test the use of the `in` operator 
tests/en_spell_dict_test.py