input: Write a python function to test the Queue class methods.
  assert q.isEmpty() == True
  q.enqueue(4)
  q.enqueue('dog')
  q.enqueue(True)
  assert q.size() == 3
  assert q.isEmpty() == False
  assert q.dequeue() == 4
  assert q.dequeue() == 'dog'
  assert q.size() == 1
output: def test_queue():
      class Queue:
          def __init__(self):
              self.items = []
  
          def isEmpty(self):
              return self.items == []
  
          def enqueue(self, item):
              self.items.insert(0, item)
  
          def dequeue(self):
              return self.items.pop()
  
          def size(self):
              return len(self.items)
  
      q = Queue()
      assert q.isEmpty() == True
      q.enqueue(4)
      q.enqueue('dog')
      q.enqueue(True)
      assert q.size() == 3
      assert q.isEmpty() == False
      assert q.dequeue() == 4
      assert q.dequeue() == 'dog'
      assert q.size() == 1