def test_dequeue():
q = MyQueue()
q.enqueue(1)
q.enqueue(2)
assert 2 == q.size()
assert 1 == q.dequeue()
assert 1 == q.size()
assert 2 == q.dequeue()
assert 0 == q.size()
assert 1 == q.isEmpty()
def test_size():
q = MyQueue()
q.enqueue(1)
q.enqueue(2)
q.enqueue(3)
assert 3 == q.size()
q.enqueue(4)
assert 4 == q.size()
q.dequeue()
q.dequeue()
q.dequeue()
assert 1 == q.size()
def test_enqueue():
q = MyQueue()
assert 2 == q.enqueue(2)
assert 1 == q.size()
assert 5 == q.enqueue(5)
assert 2 == q.size()