def test_when_instantiated_wth_custom_word_set(self):
        custom_word_set = WordSet(set(['bat', 'banana', 'shoe', 'dog']))
        scrabble_calc = WordScrabbleCalculator('groade', custom_word_set)

        self.assertEqual(scrabble_calc.word_set(), custom_word_set())
    def test_when_instantiated_wth_default_word_set(self):
        default_word_set = WordSet()
        scrabble_calc = WordScrabbleCalculator('')

        self.assertEqual(scrabble_calc.word_set(), default_word_set())