如何在nestjs测试中覆盖导入的模块？

import { Test } from '@nestjs/testing';
import { MyService } from './my.service';
import { MyModule } from './my.module';

jest.mock('./my.service'); // 模拟导入的模块

describe('MyModule', () => {
  let myService: MyService;

  beforeEach(async () => {
    const moduleRef = await Test.createTestingModule({
      imports: [MyModule],
    }).compile();

    myService = moduleRef.get<MyService>(MyService);
  });

  it('should do something', () => {
    // 在测试中使用模拟的模块
    expect(myService.doSomething()).toBe('mocked result');
  });
});

import { Test } from '@nestjs/testing';
import { MyService } from './my.service';
import { MyModule } from './my.module';

describe('MyModule', () => {
  let myService: MyService;

  beforeEach(async () => {
    const moduleRef = await Test.createTestingModule({
      imports: [MyModule],
      providers: [
        {
          provide: MyService,
          useValue: {
            doSomething: jest.fn().mockReturnValue('mocked result'), // 使用jest.fn()创建模拟函数
          },
        },
      ],
    }).compile();

    myService = moduleRef.get<MyService>(MyService);
  });

  it('should do something', () => {
    // 在测试中使用模拟的模块
    expect(myService.doSomething()).toBe('mocked result');
    expect(myService.doSomething).toHaveBeenCalled(); // 验证模拟函数是否被调用
  });
});