测试Redux - 测试简单的Action

import {
  CounterActions,
  INCREMENT_COUNTER,
  DECREMENT_COUNTER,
} from './counter';
// Mock out the NgRedux class with just enough to test what we want.
class MockRedux extends NgRedux<any> {
  constructor() {
    super(null);
  }
  dispatch = () => undefined;
}
describe('counter action creators', () => {
  let mockRedux: NgRedux<any>;
  beforeEach(() => {
    // Initialize mock NgRedux and create a new instance of the
    // ActionCreatorService to be tested.
    mockRedux = new MockRedux();
    actions = new CounterActions(mockRedux);
  });
  it('increment should dispatch INCREMENT_COUNTER action', () => {
    const expectedAction = {
      type: INCREMENT_COUNTER
    };
    spyOn(mockRedux, 'dispatch');
    expect(mockRedux.dispatch).toHaveBeenCalled();
    expect(mockRedux.dispatch).toHaveBeenCalledWith(expectedAction);
  });
  it('decrement should dispatch DECREMENT_COUNTER action', () => {
    const expectedAction = {
      type: DECREMENT_COUNTER
    };
    spyOn(mockRedux, 'dispatch');
    actions.decrement();
    expect(mockRedux.dispatch).toHaveBeenCalled();
    expect(mockRedux.dispatch).toHaveBeenCalledWith(expectedAction);
});