Loopback-4 Mocking injection

Question

i'm using loopback-4, looking for help to mock the @inject declared at class level.

Please find below code.

import { repository } from '@loopback/repository';
import { AddressRepository } from './address.repository';
import { Address } from './address.db.model';

export class AddressService {
    @repository(AddressRepository) private addressRepo: AddressRepository;

    async getAddresses(): Promise<Address[]> {
      return this.addressRepo.find();
    }
}

i am trying to mock through @loopback/testlab.StubbedInstanceWithSinonAccessor but its not working, as i am not using constructor injection. tried with below approach but it wont allow.

let addressRepo: StubbedInstanceWithSinonAccessor<AddressRepository>;
const addressService = new AddressService(addressRepo);

can some one help in mocking @injector which is not declared at constructor level?

thank you in advance.

Where do you want `@inject` to be declared? `@inject` can also be used in the properties of the class. — Zhikai Xiong, Sep 16 '19 at 11:38

score 0 · Accepted Answer · answered Oct 04 '19 at 15:22

Since your dependency is declared as a property, you need to provide the stubbed implementation via a property setter.

Make your property public so that it can be changed from outside.

export class AddressService {
  @repository(AddressRepository) 
  public addressRepo: AddressRepository;

  // ...
}

Use a regular property setter in your tests.

let addressRepo: StubbedInstanceWithSinonAccessor<AddressRepository>;
const addressService = new AddressService();
addressService.addressRepo = addressRepo;

Loopback-4 Mocking injection

1 Answers1