def test_queue_instantiation(self):
        # Arrange
        queue = Queue()

        # Act, Assert
        assert queue.maxsize == 0
        assert queue.qsize() == 0
        assert queue.empty()
        assert not queue.full()
    def test_queue_instantiation(self):
        # Arrange
        queue = Queue()

        # Act
        # Assert
        self.assertEqual(0, queue.maxsize)
        self.assertEqual(0, queue.qsize())
        self.assertTrue(queue.empty())
        self.assertFalse(queue.full())
    def test_put_to_maxlen_makes_queue_full(self):
        # Arrange
        queue = Queue(maxsize=5)

        # Act
        queue.put_nowait("A")
        queue.put_nowait("B")
        queue.put_nowait("C")
        queue.put_nowait("D")
        queue.put_nowait("E")

        # Assert
        assert queue.qsize() == 5
        assert queue.full()
    def test_put_to_maxlen_makes_queue_full(self):
        # Arrange
        queue = Queue(maxsize=5)

        # Act
        queue.put_nowait("A")
        queue.put_nowait("B")
        queue.put_nowait("C")
        queue.put_nowait("D")
        queue.put_nowait("E")

        # Assert
        self.assertEqual(5, queue.qsize())
        self.assertTrue(queue.full())