def test_is_empty(self):
queue = SimpleQueue()
assert queue.is_empty() is True
queue.add(1)
assert queue.is_empty() is False
queue.dequeue()
assert queue.is_empty() is True
def test_dequeue(self):
queue = SimpleQueue()
with self.assertRaises(SimpleQueueDequeueException):
queue.dequeue()
one = 1
two = 2
queue.add(one)
queue.add(two)
assert queue.size() == 2
assert queue.dequeue() == one
assert queue.dequeue() == two
assert queue.size() == 0
