RoyM's questions

我似乎无法弄清楚为什么这个测试失败了；我已将问题减少到这两个文件..

[文件：esm-user.js]

const getJack = () => {return 'Jack';};
const getJill = () => {return 'Jill';};
const getUsers = () => {return [getJack(), getJill()];};
export default { getUsers, getJack };

[文件：esm-user-spy.spec.js]

import users from './esm-user';

describe("Mocks and Spies", () => {
  test.only("partial mock (jack)", () => {
    var getJackSpy = jest.spyOn(users, 'getJack').mockReturnValue('Mock Jack');
    expect(users.getUsers()).toEqual(['Mock Jack', 'Jill']);
  });
});

[输出]

expect(received).toEqual(expected) // deep equality
  Array [
-   "Mock Jack",
+   "Jack",
    "Jill",
  ]