无法读取单元测试中继承方法的属性"查找"

Question

>im在尝试为我的NestJS应用程序运行e2e测试时遇到问题，因此使用mongodb内存服务器在内存中运行mongo

。我的 E2E 测试如下所示

describe('UsersController.e2e', () => {
let app: INestApplication;
let module: TestingModule;
const mongod = new MongoMemoryServer();
beforeAll(async () => {
const port = await mongod.getPort();
const database = await mongod.getDbName();
module = await Test.createTestingModule({
providers: [UserRepository, UserService],
controllers: [UserController],
imports: [TypeOrmModule.forRootAsync({
useFactory: () => {
return {
type: 'mongodb',
host: '127.0.0.1',
port,
database,
entities: [__dirname + '../../../**/*.entity{.ts,.js}'],
} as TypeOrmModuleOptions;
},
}),
TypeOrmModule.forFeature([User])
]
}).compile();
app = module.createNestApplication();
await app.init();
});
afterAll(async () => {
await module.close();
await app.close();
});
describe('GET /users', () => {
it('should return a collection of user resources', async () => {
const { body } = await supertest
.agent(app.getHttpServer())
.get('/users')
.set('Accept', 'application/json')
.expect('Content-Type', /json/)
.expect(200);
expect(body).toEqual(userCollectionMock);
});
});
});

运行测试时，它会抛出 500 错误

Cannot read property 'find' of undefined
TypeError: Cannot read property 'find' of undefined
at UserRepository.Object.<anonymous>.MongoRepository.find (src/repository/MongoRepository.ts:77:29)
at UserRepository.index (src/modules/user/repositories/user.repository.ts:12:20)

存储库类看起来像

export class UserRepository extends MongoRepository<User> implements IResourceRepository<User> {
index(): Promise<User[]> {
return this.find();
}
}

MongoRepository 的扩展提供了 find(( https://github.com/typeorm/typeorm/blob/master/src/repository/MongoRepository.ts#L76

所以这让我感到困惑，为什么它是未定义的！

Answer 1

我知道这是一个月前的事情了，但我刚刚遇到了这个问题并解决了它。

我正在使用猫鼬+类型鹅与mongodb-memory-server。

import { MongoMemoryServer } from 'mongodb-memory-server';
describe('Auth', () => {
let app: INestApplication;
let mongoServer: MongoMemoryServer;
beforeAll(async () => {
// Set up database
mongoServer = new MongoMemoryServer();
const mongoUri = await mongoServer.getUri();
const moduleRef = await Test.createTestingModule({
imports: [
...
TypegooseModule.forRoot(mongoUri, {
useNewUrlParser: true,
useUnifiedTopology: true,
}),
...
],
controllers: [...],
providers: [...],
}).compile();
app = moduleRef.createNestApplication();
await app.init();
});
afterAll(async () => {
await mongoServer.stop();
});
});

我犯的主要错误是我单独覆盖了我的User Typegoose注入。

providers: [
// THIS WAS MY MISTAKE!
{
provide: getModelToken('User'),
useValue: mockUserModel,
},
],

我知道这不是你问题的完整答案，但我希望这可能会对你有所帮助。