Notification service with Spectator

notification.service.spec.ts

import { SpectatorService, SpyObject, createService } from '@netbasal/spectator/jest';
import { MatSnackBar } from '@angular/material/snack-bar';

import { NotificationService } from './notification.service';

describe('Service: NotificationService', () => {
  let snackBar: SpyObject<MatSnackBar>;

  let spectator: SpectatorService<NotificationService> = createService({
    service: NotificationService,
    mocks: [MatSnackBar]
  });

  beforeEach(() => {
    snackBar = spectator.get(MatSnackBar);
  });

  it('exists', () => {
    expect(spectator.service).toBeDefined();
  });

  it('can pop open a snackbar notification', () => {
    spectator.service.notify('mock notification');
    expect(snackBar.open).toHaveBeenCalledWith('mock notification', 'CLOSE', {
      duration: 7000
    });
  });
});

notification.service.ts

import { Injectable } from '@angular/core';
import { MatSnackBar } from '@angular/material/snack-bar';

@Injectable({ providedIn: 'root' })
export class NotificationService {
  constructor(private _snackBar: MatSnackBar) {}

  notify(message: string, duration = 7000): void {
    this._snackBar.open(message, 'CLOSE', { duration });
  }
}