def test_return(self):
        obj = Lockable()
        self.assertEqual(obj.check(1, y=2), (1, 2))
        self.assertFalse(obj._lock.locked)
A method wrapped with @synchronized is called with the lock acquired,
dataset/ETHPy150Open itamarst/crochet/crochet/tests/test_util.py/SynchronizedTests.test_return