def test_cpu_turn_0(self):
mock_dbutil = mock.MagicMock()
mock_dbutil.fetch_optimal_word_from_dictionary.return_value = "hello"
with mock.patch("main.DBUtil", return_value=mock_dbutil):
wordchain = WordChain("test_dictionary.txt")
ret = wordchain.cpu_turn()
self.assertEqual(ret, ["hello", 0])
