开玩笑教程中的异步测试

Question

嗨，我

正在尝试与此示例教程相同，但它给了我错误。

https://jestjs.io/docs/en/tutorial-async

  expect(received).toEqual(expected)
    Expected value to equal:
      "Paul"
    Received:
      undefined
    Difference:
      Comparing two different types of values. Expected string but received undefined.
      14 | it('works with async/await and resolves', async () => {
      15 |   expect.assertions(1);
    > 16 |   await expect(user.getUserName(5)).resolves.toEqual('Paul');
         |                                                ^
      17 | });

每个都是一样的，我的服务器返回一个 json，但开玩笑说在 HTTP get 之后未定义

{"id":10002,"name":"test","passportNumber":"A1234568"}

Answer 1

它返回未定义，因为源函数不是承诺函数。 这是普通函数。