Question

我正在尝试使用NestJs框架创建一个Jest测试。

该测试应检查控制器和服务，但是1）控制器未定义，2）服务未定义。

这是我的 home-cards.controller.spec.ts 中的代码：

ObjectMapper

错误：

作为控制器询问用户的新错误：

describe('HomeCardsController', () => {
    let homeCardsController: HomeCardsController;
    let homeCardsService: HomeCardsService;

    beforeEach(async () => {
        const module = await Test.createTestingModule({
            imports: [TypeOrmModule.forFeature([HomeCard])],
            controllers: [HomeCardsController],
            providers: [HomeCardsService]
        }).compile();

        homeCardsController = module.get<HomeCardsController>(HomeCardsController);
        homeCardsService = module.get<HomeCardsService>(HomeCardsService);
    });

    describe('findall', () => {
        it('should return an array of home cards', async () => {
            expect( await homeCardsController.findAll(1000)).toBeInstanceOf(Array);
        });
    });
});

Answer 1

您必须模拟调用HomeCardsController的HomeCardsService方法

import { HomeCardService } from './home-cards.service.ts'; // your path to service
jest.mock('./home-cards.service.ts'); // your path to service

describe('HomeCardsController', () => {
    let homeCardsController: HomeCardsController;
    let homeCardsService: HomeCardsService;

    beforeEach(async () => {
        const module = await Test.createTestingModule({
            // imports: [TypeOrmModule.forFeature([HomeCard])], <- unit test don't need database, mock all
            controllers: [HomeCardsController],
            providers: [HomeCardsService]
        }).compile();

        homeCardsController = module.get<HomeCardsController>(HomeCardsController);
        homeCardsService = module.get<HomeCardsService>(HomeCardsService);
    });

    describe('findall', () => {
        it('should return an array of home cards', async () => {
            const result = []; // some result for mock method
            jest.spyOn(homeCardsService, 'findAll').mockImplementation(() => result);
            const request = {user: {clientId: 1000}}
            expect( await homeCardsController.findAll(request)).toBeInstanceOf(Array);
        });
    });
});

Answer 2

在这种情况下：

expect( await homeCardsController.findAll(1000)).toBeInstanceOf(Array);

您输入的值是 1000 ，而不是请求@Req，后者应为以下对象：

const request = {
  user: {
    clientId: 1000
  }
}
expect( await homeCardsController.findAll(request)).toBeInstanceOf(Array);

如果您愿意，可以像这样模拟存储库（HomeCardsService下方大括号中的语法）：

beforeEach(async () => {
  const module = await Test.createTestingModule({
    controllers: [HomeCardsController],
    providers: [
      HomeCardsService,
      {
        provide: getRepositoryToken(HomeCard),
        useValue: jest.fn(() => ({
        save: jest.fn().mockReturnThis(),
        createQueryBuilder: jest.fn(() => ({
          select: jest.fn().mockReturnThis(),
          where: jest.fn().mockReturnThis(),
          getOne: jest.fn().mockReturnValueOnce(someMockedValue),
        })),
        }))(),
      },
    ]
  }).compile();

尝试用开玩笑测试我的Nest API，返回未定义

2 个答案: