开玩笑教程中的异步测试

Question

嗨，我正在尝试与本示例教程相同，但是它给了我错误。

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 | });

每一样都一样，我的服务器返回一个json，但在http get之后开玩笑说未定义

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

Answer 1

它返回未定义的，因为源函数不是promise函数。这是普通功能。