def test_destroyStack(self):
stack = Stack()
stack.createStack()
stack.push(5)
stack.push(9)
stack.destroyStack()
self.assertIsNone(stack.top)
def test_isEmpty(self):
stack = Stack()
stack.createStack()
self.assertTrue(stack.isEmpty())
stack.push(9)
self.assertFalse(stack.isEmpty())
stack.destroyStack()
self.assertTrue(stack.isEmpty())
