unit-testing a service which uses apollo-angular

Hey,

i want to test a service which uses apollo. The Service looks like that:

import { Injectable } from '@angular/core';
import { Apollo } from 'apollo-angular';
import gql from 'graphql-tag';

const MuUserRegister = gql`
  mutation {userRegister (
      email:"4",
      username: "4"
      password: "test"
      ) {
    data {
      _id,
      email,
      username
    }
  }}
`

@Injectable()
export class AuthService {
  constructor(private apollo: Apollo) {}

  register() {
    return this.apollo.mutate({
      mutation: MuUserRegister
    });
  }
}

The test looks like that:

import { AuthService } from './auth.service'

describe('test service', () => {
  it('test Auth Service', (done: DoneFn) => {
    let service = new AuthService(???)
    let test = service.register()
    test.subscribe(({data}) => {
      expect(data).toEqual(null);
      done()
    });
  });
});

My question is: what and how should i provide the apollo module/client in the line let service = new AuthService(???) Is this the right approach to unit-test the apollo-client?

thx in advance

[kuncevic]

https://www.apollographql.com/docs/angular/guides/testing.html#An-introduction

[Fattouh92]

That is the current way to test apollo-angular: https://www.apollographql.com/docs/graphql-tools/mocking.html