ng2-mock

An easy way to mock your Angular elements.

Note: If you are using Angular < 5 use v0.0.7 of ng2-mock Note: If you are using Angular < 6 use v0.1.0 of ng2-mock

Currently Supported Angular Elements

• Component
• Pipe
• Directive
• Service
• Guard
• Module

Installation

npm install --save-dev ng2-mock

Usage

Just call the Mock() function with your desired class(es) and let ng2-mock do the magic.

Mock() accepts an arbitrary number of supported angular elements as an argument and returns their mocked versions. If it detects an Injectable class, e.g. Services, as input it mocks the class and returns a provider object

{ provide: MyInjectableClass, useValue: MockedMyInjectableClass }

wrapping the mocked element, so you don't have to override the provider yourself.

Note: In order for a mocked service method to return a value other than undefined you have to use spies (Jasmine.spyOn() for example).

Example

import { Mock } from 'ng2-mock';

describe('AppComponent', () => {
  let app: AppComponent;
  let fixture: ComponentFixture<AppComponent>;
    
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent,
        Mock(MyAComponent),
        Mock(MyBComponent, MyCComponent, APipe),
      ],
      providers: [
        Mock(MyAService),
        Mock(MyBService, MyCService, MyDService),  
      ],
    }).compileComponents();
    
  beforeEach(() => {
    fixture = TestBed.createComponent(MapComponent);
    app = fixture.componentInstance;
    fixture.detectChanges();
  });
    
  }));

  it('should create the app', () => {
    expect(app).toBeTruthy();
  });
  
  it('should call CService.doSomething', () => {
      // Spying on a mocked service
      const cServiceInstance = TestBed.get(MyCService);
      const spy = spyOn(cServiceInstance, 'doSomething');
      app.methodWhichCallsCServiceDoSomething();
      expect(spy).toHaveBeenCalled();
    });
});