Jest 部分模块模拟未被调用

Question

我真的不确定我是否以正确的方式这样做！

我有一个正在测试的模块和一个测试脚本。MUT 中有 2 个函数，其中一个函数使用另一个函数。我尝试模拟该模块以用模拟替换实际的支持功能，但它似乎没有被调用。我这样做是正确的还是你不能因为引用平等而这样做？

穆特

const total_users = 100;

export function getRandomIntInclusive(min=0, max=0) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1) + min); //The maximum is inclusive and the minimum is inclusive
}

export default function getUsername(name='user'){
  return `${name}_${getRandomIntInclusive(1, total_users)}`;
}

测试代码：

import getUsername, {getRandomIntInclusive} from "../generateUsername";

const randomSpy = jest.spyOn(Math, 'random');


jest.mock('../generateUsername', () => {
  const originalModule = jest.requireActual('../generateUsername');

  return {
    __esModule: true,
    ...originalModule,
    getRandomIntInclusive: jest.fn((min=0, max=0) => 5), // <-- mock
  };
});

describe("The 'randomNumber' function", () => {
  beforeEach(() => {
    randomSpy.mockClear();
  });
  
  it("Generates a random number between 2 values (inclusive)", () => {
    randomSpy.mockReturnValue(0.9);
    expect(getUsername('john')).toBe(`john_91`);
    expect(randomSpy).toBeCalledTimes(1);
    expect(getRandomIntInclusive).toHaveBeenCalled(); // <-- execution of mock. Test fails here
  });

  it.todo('Throws an error if no name is passed')
});

Result:
     expect(jest.fn()).toHaveBeenCalled()

        Expected number of calls: >= 1
        Received number of calls:    0