具有模拟存储的组件的单元测试

这是将 Store 作为依赖项的组件的单元测试。在这里，我们正在创建一个名为 MockStore 的新类，它被注入到我们的组件中而不是通常的 Store 中。

import { Injectable } from '@angular/core';
import { TestBed, async} from '@angular/core/testing';
import { AppComponent } from './app.component';
import {DumbComponentComponent} from "./dumb-component/dumb-component.component";
import {SmartComponentComponent} from "./smart-component/smart-component.component";
import {mainReducer} from "./state-management/reducers/main-reducer";
import { StoreModule } from "@ngrx/store";
import { Store } from "@ngrx/store";
import {Observable} from "rxjs";

class MockStore {
  public dispatch(obj) {
    console.log('dispatching from the mock store!')
  }

  public select(obj) {
    console.log('selecting from the mock store!');

    return Observable.of({})
  }
}

describe('AppComponent', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent,
        SmartComponentComponent,
        DumbComponentComponent,
      ],
      imports: [
        StoreModule.provideStore({mainReducer})
      ],
      providers: [
        {provide: Store, useClass: MockStore}
      ]
    });
  });

  it('should create the app', async(() => {

    let fixture = TestBed.createComponent(AppComponent);
    let app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  }));