Jestjs 尝试使用mock/spy时出现矛盾错误

我发现了一个看似矛盾的错误：

Button › triggers a click

expect(received).toBeCalled()

Matcher error: received value must be a mock or spy function

Received has type:  function
Received has value: [Function spy]

我的规格如下所示：

const spy = () => jest.fn()
  ...
it('triggers a click', async () => {
  await btn.trigger('click');
  expect(spy).toBeCalled();
})

有人知道为什么我会收到一个错误，说我需要提供一个间谍功能，而它说它已经收到了“间谍功能”