Angular 2 unittest: Failed to mock service

[Saar ku]

I'm trying to test my login form component:

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
import { AuthService } from '../../../shared/services';

@Component({
    selector: 'login',
    templateUrl: 'login.component.html',
    providers: [AuthService],
    styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {

    loginForm: FormGroup;
    username: FormGroup;
    password: FormGroup;

    constructor(private fb: FormBuilder,
        private authService: AuthService)
    { }

    ngOnInit() {
        this.loginForm = this.fb.group({
            username: ['', Validators.required],
            password: ['', Validators.required]
        });
    }

    submit() {
        this.authService.login();
    }
}

this is the test:

import {
    inject,
    TestBed
} from '@angular/core/testing';

import { ReactiveFormsModule } from '@angular/forms';
import { LoginComponent } from './login.component';
import { AuthService } from '../../../shared/services/auth.service';
import { ComponentFixture } from '@angular/core/testing';

class MockAuthService {
    login() {
        return true;
    }
};

describe('LoginComponent', () => {
    let fixture: ComponentFixture<LoginComponent>;
    let login: LoginComponent;

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [
                ReactiveFormsModule
            ],
            providers: [
                {
                    provide: AuthService,
                    useClass: MockAuthService
                }
            ],
            declarations: [LoginComponent]

        });

        fixture = TestBed.createComponent(LoginComponent);
        login = fixture.componentInstance;
    });
    it('should submit the form to auth', inject([AuthService],
        (auth: AuthService) => {
            login.ngOnInit();
            spyOn(auth, 'login');
            login.submit();
            expect(auth.login).toHaveBeenCalled();
        }));
});

For some reason I can't understand, the test throws an error:

Error: No provider for RequestHandlerService!.

RequestHandler is a service I use in AuthService, which means that the test is not using my mocked class MockAuthService. Can you help figure out what I did wrong in the mocking?

Thanks.