测试简单的 Action

考虑下面的简单动作,取自本书的Redux章节:

  1. import { Injectable } from '@angular/core';
  2. import { NgRedux } from 'ng2-redux';
  3. export const INCREMENT_COUNTER = 'INCREMENT_COUNTER';
  4. export const DECREMENT_COUNTER = 'DECREMENT_COUNTER';
  5. @Injectable
  6. export class CounterActions {
  7. constructor(private redux: NgRedux<any>) {}
  8. increment() {
  9. this.redux.dispatch({ type: INCREMENT_COUNTER });
  10. }
  11. decrement() {
  12. this.redux.dispatch({ type: DECREMENT_COUNTER });
  13. }
  14. }

这些是很简单的测试:

  1. import { NgRedux } from 'ng2-redux';
  2. import {
  3. CounterActions,
  4. INCREMENT_COUNTER,
  5. DECREMENT_COUNTER,
  6. } from './counter';
  7. // Mock out the NgRedux class with just enough to test what we want.
  8. class MockRedux extends NgRedux<any> {
  9. constructor() {
  10. super(null);
  11. }
  12. dispatch = () => undefined;
  13. }
  14. describe('counter action creators', () => {
  15. let actions: CounterActions;
  16. let mockRedux: NgRedux<any>;
  17. beforeEach(() => {
  18. // Initialize mock NgRedux and create a new instance of the
  19. // ActionCreatorService to be tested.
  20. mockRedux = new MockRedux();
  21. actions = new CounterActions(mockRedux);
  22. });
  23. it('increment should dispatch INCREMENT_COUNTER action', () => {
  24. const expectedAction = {
  25. type: INCREMENT_COUNTER
  26. };
  27. spyOn(mockRedux, 'dispatch');
  28. actions.increment();
  29. expect(mockRedux.dispatch).toHaveBeenCalled();
  30. expect(mockRedux.dispatch).toHaveBeenCalledWith(expectedAction);
  31. });
  32. it('decrement should dispatch DECREMENT_COUNTER action', () => {
  33. const expectedAction = {
  34. type: DECREMENT_COUNTER
  35. };
  36. spyOn(mockRedux, 'dispatch');
  37. actions.decrement();
  38. expect(mockRedux.dispatch).toHaveBeenCalled();
  39. expect(mockRedux.dispatch).toHaveBeenCalledWith(expectedAction);
  40. });
  41. });

我们只是确保我们的action创建者正确地分派actions。