Escribí una prueba unitaria para mi proyecto Nest.js. Solo quiero confirmar que esta prueba es correcta.
Estoy probando el archivo de servicio de nido. A continuación se muestra el código:
tareas.servicio.ts
async getTaskById(id: string): Promise<Task> { const found = await this.taskModel.findById(id); if (!found) { throw new NotFoundException(`Task not found`); } return found; }tareas.servicio.spec.ts
const mockTask = () => { return { _id: '613e4135ea46be481c2d88b2', name: 'Task 1', description: 'Go to school', }; }; const tasksServiceMock: Partial<TasksService> = { getTaskById: jest.fn().mockResolvedValue(mockTask()), }; describe('TasksService', () => { let service: TasksService; beforeEach(async () => { const module: TestingModule = await Test.createTestingModule({ providers: [ TasksService, { provide: TasksService, useValue: tasksServiceMock, }, ], }).compile(); service = module.get<TasksService>(TasksService); }); it('should be defined', () => { expect(service).toBeDefined(); }); describe('getTaskById', () => { it('should get task by ID', async () => { const task = await service.getTaskById(mockTask()._id); expect(task).toEqual(mockTask()); }); it('should throw task Not found error', async () => { tasksServiceMock.getTaskById = jest .fn() .mockRejectedValue(new NotFoundException('Task not found')); expect.assertions(2); try { await service.getTaskById('123456'); } catch (e) { expect(e).toBeInstanceOf(NotFoundException); expect(e.message).toBe('Task not found'); } }); }); });Estás cubriendo las pruebas unitarias correctamente. Tengo 2 sugerencias para la sintaxis:
mockTask directamente como un objeto en lugar de asignar la función de flechatry catch it("should throw task Not found error", async () => { const mockError = new NotFoundException("Task not found"); tasksServiceMock.getTaskById = jest.fn().mockRejectedValue(mockError); expect.assertions(2); await expect(service.getTaskById("123456")).rejects.toThrowError(mockError); });