如何用茉莉花/卡玛用Angular5，ngrx5测试ngrx/效应？

Question

这是我需要测试的文件。我正在使用Angular5 (^5.2.0)、ngrx5 (^5.2.0)，目前我的注意力集中在一些效果服务上。这是我目前需要测试的代码。但我不知道如何正确地实现它，我做了一些尝试，但它们只是失败。你们有小费吗？谢谢

import { Injectable } from '@angular/core';
import { Actions, Effect } from '@ngrx/effects';
import { FETCH_DATA } from '../reducers/data.reducer';
import { DataService } from './data.service';
import { Subject } from 'rxjs/Subject';
import { ActionWithPayload } from '../types/app-actions';

@Injectable()
export class AutoCompleteEffects {
  public autoComplete$ = new Subject<{
    type: string;
    payload: { results: string[]; searchValue: string };
  }>();

  @Effect()
  getData$ = this.actions$.ofType(FETCH_DATA).switchMap((action: ActionWithPayload) => {
    return this.data
      .getData(action.payload)
      .map(results => ({
    type: 'FETCHED_DATA',
    payload: { results, searchValue: action.payload }
      }))
      .catch(() =>
    Observable.of({
      type: 'FETCHED_DATA',
      payload: { results: [], searchValue: action.payload }
    })
      );
  });


  constructor(
    private actions$: Actions,
    private data: DataService,
  ) {
    this.getData$.subscribe(action => this.autoComplete$.next(action));
  }

  public getAutoCompleteEffects() {
    return this.autoComplete$.asObservable();
  }
}

Answer 1

有几件事你需要拥有

1. 使用provideMockActions遵循ngrx效果测试设置(参见这)
2. 模拟DataService并注入它

在那之后，这只是一个不同动作的测试

it('should suggest auto complete values', () => {
  actions = of([<test-actions>]);
  const expectedEffects = of([<expected-actions-from-effects>]);

  expect(TestBed.get(AutoCompleteEffects).getData$).toBeObservable(expectedEffects);
});