Question

我正在尝试编写一个简单的TODO App的测试。

这是我的服务测试课程：


    const mockTaskRepository = () => ({
        createTask: jest.fn(),
    });

    describe('TasksService', () => {
        let tasksService;
        let taskRepository;

      beforeEach(async () => {
            const module = await Test.createTestingModule({
                providers: [TasksService, { provide: TaskRepository, useFactory: mockTaskRepository }],
            }).compile();

            tasksService = await module.get<TasksService>(TasksService);
            taskRepository = await module.get<TaskRepository>(TaskRepository);
        });

      describe('create task', () => {
            it('calls taskRepository.create() and returns the result', async () => {
                const createTaskDto = {
                    title: 'Test task',
                    description: 'Test desc',
                };
                taskRepository.createTask.mockResolvedValue('someTask');
                expect(taskRepository.createTask).not.toHaveBeenCalled();
                const result = await tasksService.createTask(createTaskDto);
                expect(taskRepository.createTask).toHaveBeenCalledWith(createTaskDto);
                expect(result).toEqual('someValue');
            });
        });
    });

这是我的任务服务：


@Injectable()
export class TasksService {
    constructor(
        @InjectRepository(TaskRepository)
        private taskRepository: TaskRepository,
    ) {}

    async createTask(createTaskDto: CreateTaskDto): Promise<Task> {
        const { title, description } = createTaskDto;
        const task = new Task();
        task.title = title;

        task.description = description;
        task.status = TaskStatus.IN_PROGRESS;
        await task.save();

        return task;
    }
}

当我尝试运行“创建任务”测试时，发生以下错误。

FAIL  src/tasks/tasks.service.spec.ts
  ● TasksService › create task › calls taskRepository.create() and returns the result

    ConnectionNotFoundError: Connection "default" was not found.

      at new ConnectionNotFoundError (error/ConnectionNotFoundError.ts:8:9)
      at ConnectionManager.Object.<anonymous>.ConnectionManager.get (connection/ConnectionManager.ts:40:19)
      at Object.getConnection (index.ts:247:35)
      at Function.Object.<anonymous>.BaseEntity.getRepository (repository/BaseEntity.ts:85:72)
      at Task.Object.<anonymous>.BaseEntity.save (repository/BaseEntity.ts:50:42)
      at TasksService.createTask (tasks/tasks.service.ts:35:14)
      at Object.<anonymous> (tasks/tasks.service.spec.ts:69:38)

Test Suites: 1 failed, 1 passed, 2 total
Tests:       1 failed, 8 passed, 9 total

任何人都知道代码中有什么错误吗？

..........................................

谢谢！

Answer 1

如果它正在寻找连接default，那么我认为仍在考虑TypeOrmModule配置。如果您有TaskEntity，请尝试将其更改为provide: TaskRepository而不是provide: getRepositoryToken(TaskEntity)。这将告诉Nest覆盖@InjectRepository()装饰器尝试提供的默认存储库。

如果不是这种情况，您是否也可以添加TaskService和TaskModule类？

Answer 2

您应该模拟存储库，然后调出测试模块的上下文。否则，将通过Nest的DI将真正的存储库注入服务。

            const module = await Test.createTestingModule({
                providers: [
                {
                      provide: getRepositoryToken(YourEntityClass),
                      useValue: mockedRepo, // or use class
                }, 
                TasksService],
            }).compile();

            tasksService = await module.get<TasksService>(TasksService);
            // taskRepository = await module.get<TaskRepository>(TaskRepository); don't have to do that if `useValue` was used instead of factory

所以TL; DR：在这种情况下，provide: TaskRepository应提供Token的给定Injectable：https://docs.nestjs.com/fundamentals/custom-providers#non-class-based-provider-tokens

Answer 3

测试预期会调用方法Repository.createTask，但是方法Service.createTask没有进行调用。

修复：更新 Service方法，以将任务创建委托给 Repository方法。

// tasks.service.ts

async createTask(createTaskDto: CreateTaskDto, user: User): Promise<Task> {
        return this.taskRepository.createTask(createTaskDto, user);
}

// tasks.repository.ts

async createTask(createTaskDto: CreateTaskDto, user: User): Promise<Task> {
        const { title, description } = createTaskDto;
        const task = new Task();
        task.title = title;
        task.user = user;
        task.description = description;
        task.status = TaskStatus.IN_PROGRESS;
        await task.save();
        delete task.user;

        return task;
    }
}

NestJs-Jest-测试：ConnectionNotFoundError：未找到连接“默认”

3 个答案: