我正在寻找一种方法来测试我的NestJs PlayerController与Jest。我的控制器和服务声明:
import { QueryBus, CommandBus, EventBus } from '@nestjs/cqrs';
/**
* The service assigned to query the database by means of commands
*/
@Injectable()
export class PlayerService {
/**
* Ctor
* @param queryBus
*/
constructor(
private readonly queryBus: QueryBus,
private readonly commandBus: CommandBus,
private readonly eventBus: EventBus
) { }
@Controller('player')
@ApiUseTags('player')
export class PlayerController {
/**
* Ctor
* @param playerService
*/
constructor(private readonly playerService: PlayerService) { }
我的测试:
describe('Player Controller', () => {
let controller: PlayerController;
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
imports: [PlayerService, CqrsModule],
controllers: [PlayerController],
providers: [
PlayerService,
],
}).compile();
controller = module.get<PlayerController>(PlayerController);
});
it('should be defined', () => {
expect(controller).toBeDefined();
});
...
Nest无法解析PlayerService(?,CommandBus,EventBus)的依赖关系。请确保indexService [0]中的参数在PlayerService上下文中可用。
at Injector.lookupComponentInExports (../node_modules/@nestjs/core/injector/injector.js:180:19)
有办法解决这个依赖问题吗?
它不起作用,因为您正在导入PlayerService
。您只能导入模块,提供程序可以通过模块导入或在providers
数组中声明:
imports: [PlayerService, CqrsModule]
^^^^^^^^^^^^^
但是,在单元测试中,您希望单独测试单个单元,而不是不同单元之间的交互及其依赖性。因此,比导入或声明您的依赖项更好,将为PlayerService
或CqrsModule
的提供者提供模拟。
有关单元和e2e测试之间的区别,请参阅this answer。
有关如何创建模拟的信息,请参阅this answer。