testing.md

Testing

@ngrx/effects/testing

provideMockActions

Provides a mock test provider of the Actions Observable for testing effects. This works well with writing marble tests and tests using the subscribe method on an Observable. The mock Actions will deliver a new Observable to subscribe to for each test.

Usage:

import { TestBed } from '@angular/core/testing';
import { provideMockActions } from '@ngrx/effects/testing';
import { ReplaySubject } from 'rxjs/ReplaySubject';
import { hot, cold } from 'jasmine-marbles';
import { MyEffects } from './my-effects';

describe('My Effects', () => {
  let effects: MyEffects;
  let actions: Observable<any>;

  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        MyEffects,
        provideMockActions(() => actions),
        // other providers
      ],
    });

    effects = TestBed.get(MyEffects);
  });

  it('should work', () => {
    actions = hot('--a-', { a: SomeAction });

    const expected = cold('--b', { b: AnotherAction });

    expect(effects.someSource$).toBeObservable(expected);
  });

  it('should work also', () => {
    actions = new ReplaySubject(1);

    actions.next(SomeAction);

    effects.someSource$.subscribe(result => {
      expect(result).toEqual(AnotherAction);
    });
  });  
});