NestJS TypeORM InjectRepository Cannot read property 'prototype' of undefined

Question

Trying to unit test. Got following error:

TypeError: Cannot read property 'prototype' of undefined

export class UserService {

constructor(@InjectRepository(User) private readonly userRepository: Repository < User>) { }

spec.ts:

describe('AuthController', () => {
let authController: AuthController;
let authService: AuthService;
let mockRepository = {

};
beforeEach(async () => {
    const module = await Test.createTestingModule({
        imports: [
            TypeOrmModule.forFeature([User]),
        ],
        controllers: [AuthController],
        providers: [AuthService, {
            provide: getRepositoryToken(User),
            useValue: mockRepository
        }]
    }).compile()
    authService = module.get<AuthService>(AuthService);
    authController = module.get<AuthController>(AuthController)
});

Can someone share a solution please?

MORE INFO:

So seems like its something wrong with typeorm

beforeEach(async () => {
    const module = await Test.createTestingModule({

    }).compile()
    authService = module.get<AuthService>(AuthService);
    authController = module.get<AuthController>(AuthController)
});

With this code I'm getting exact the same error. So only problem is adding typeorm to this test Module.

So it fails because of dependency: AuthController->AuthService->UserService->TypeORM

Btw just checked UserService using API with Postman and it works fine.

Still no result:

 module = await Test.createTestingModule({
        controllers: [AuthController],
        components: [
            {
                provide: AuthService,
                useValue: {}
            },
            {
                provide: UserService,
                useValue: {}
            },
            {
                provide: getRepositoryToken(User),
                useValue: {}
            }
        ],
        providers: [
            {
                provide: AuthService,
                useValue: {}
            },
            {
                provide: UserService,
                useValue: {}
            },
            {
                provide: getRepositoryToken(User),
                useValue: {}
            }
        ]
    }).compile()
    this.authController = module.get<AuthController>(AuthController)

Also

class AuthServiceMock {
    logIn(userName) {
        return { id:100, isDeleted:false, login:"login", password:"password"};
    }

    signUp() {
        return { expireIn: 3600, token:"token" };
    }
}

describe('AuthController', () => {
let module: TestingModule;
let authController: AuthController;
let authService: AuthService;

beforeEach(async () => {
    module = await Test.createTestingModule({
        controllers: [AuthController],
        components: [

        ],
        providers: [
            {
                provide: AuthService,
                useClass: AuthServiceMock
            },
        ]
    }).compile()
    this.authController = module.get<AuthController>(AuthController)
});

@alex88 yes. I recreated project and copied all old files to new. Seems like it was some typeorm bug. — rankery
– rankery, Commented Apr 28, 2019 at 9:45

Thibault Burger · Accepted Answer · 2019-04-04 14:25:08Z

4

I looked at the project you provided in a comment under Kim Kern (https://github.com/rankery/wof-server)

You are using a barrel file (src/user/index.ts), exporting the UserModule

export * from './user.module';

I guess you are using this barrel file to import the module later on.

Now, every time the content of the barrel file is imported , the code contained in the built version of your src/user/user.module.ts is executed, which include the decoration of the UserModule class, which in turns will make Typeorm try to build a Repository, which causes the error.

You should remove this export from src/user/index.ts (or simply delete the file) and fix the broken imports caused by this removal and it should work.

edited Apr 4, 2019 at 14:25

answered Apr 4, 2019 at 13:57

Thibault Burger

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2 Comments

Samer Abu Gahgah Over a year ago

In order to let more user benefit form your answer, could you provide more explanation please.

Vương Nguyễn Over a year ago

You saved me alive!

andressh11 · Accepted Answer · 2019-03-05 19:57:59Z

2

I just passed the User entity to Repository and it works.

@Injectable()
export class UserService {
    constructor(
        @InjectRepository(User)
        private readonly userRepository: Repository<User>
    ) { }

}

Checkout docs from here: https://docs.nestjs.com/techniques/database. They have pretty good docs.

answered Mar 5, 2019 at 19:57

andressh11

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Comments

Vinci · Accepted Answer · 2021-08-02 18:45:33Z

2

I 've spent hours to figure it out and it works

 async findAll() {
    
    return await this.userRepository.createCursor(this.userRepository.find()).toArray();
  }

answered Aug 2, 2021 at 18:45

Vinci

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Comments

Kim Kern · Accepted Answer · 2019-03-06 07:27:31Z

0

When you import TypeOrmModule.forFeature(...) you also have to import TypeOrmModule.forRoot(...). But in a unit test, you probably don't want to work with your database but instead mock out all dependencies.

Your controller should not access the database directly, that's what the service is for. So if you want to test your controller and it only injects the service, you should only declare an AuthService mock and not import anything:

const module = await Test.createTestingModule({
    controllers: [AuthController],
    providers: [{
        provide: AuthService,
        useValue: authServiceMock
    }]
}).compile()

If you want to test your AuthService and it only injects the repository declare your mockRepository and leave everything else out.

answered Mar 6, 2019 at 7:27

Kim Kern

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6 Comments

rankery Over a year ago

UserService injects repository and AuthService injects UserService. I tryed ur code but still getting same error.

Kim Kern Over a year ago

Weird, typeorm is not involved at all in the controller test. What's the stacktrace of the error, where does it point to?

Kim Kern Over a year ago

Have a look at this test for reference: github.com/kiwikern/shassi-nest/blob/master/src/auth/…

rankery Over a year ago

Its point to @InjectRepository(User) at at Object.getRepositoryToken

Kim Kern Over a year ago

That's really weird. The actual UserService should never be instantiated when you unit test the AuthController or the AuthService with mocks.

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