测试ngrx:分配操作并期望存储

import { TestBed } from '@angular/core/testing';
import { StoreModule, Store } from '@ngrx/store';
import { initialState, reducer } from './app.reducer';
import { AppActions } from './app.actions';

describe('AppReducer', () => {
  let store: Store;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [
        StoreModule.forRoot({ app: reducer })
      ]
    });

    store = TestBed.inject(Store);
  });

  it('should update the state when dispatching an action', () => {
    const expectedState = { ...initialState, data: 'new data' };

    store.dispatch(AppActions.updateData('new data'));

    store.select('app').subscribe(state => {
      expect(state).toEqual(expectedState);
    });
  });
});