def test_one_valid_word_in_rack(self):
s = ScrabbleSolver('aa')
s.check_rack_for_valid_words()
self.assertEqual(['AA'], s.valid_rack_words)
def test_multiple_valid_words_in_rack(self):
s = ScrabbleSolver('set')
s.check_rack_for_valid_words()
self.assertEqual(['ES', 'EST', 'ET', 'SET', 'ST', 'TE', 'TES'],
s.valid_rack_words)
def test_no_valid_words_in_rack(self):
s = ScrabbleSolver('zz')
s.check_rack_for_valid_words()
self.assertEqual([], s.valid_rack_words)
