如何改进这个Jest测试来测试自定义操作

如何改进下面的测试。我觉得我刚刚写的这段代码可以写得更好。

const fetchResult = auth => dispatch => {
  return dispatch({
    types: [FETCH_REQUEST, FETCH_SUCCESS, FETCH_FAILURE],
    promise: axios({
      method: 'get',
      url: url,
      headers: {
        Authorization: `Token ${auth}`,
      },
    }),
  });
};

// some code for store declaration & fixture is not shown here
describe('The boats actions', () => {
  beforeEach(() => {
    // create a fresh store; 
    let store = reduxMockStore(appReducer);
  });

  const mockDispatch = f => {
    // mocked the dispatch arg so it lets the func execution to carry on
    let r = f(d => d);
    // right now, r.promise is in 'pending' state
    r.promise.then((result) => {
      expect(result.data).toEqual(ExpectedFixture);
    });
  };

  it('should match the expected signature when `fetchResults` is called', () => {
    nock(API_ENDPOINT)
      .get('/adminsearch/?&page=1')
      .reply(200, ExpectedFixture);
    mockDispatch(fetchResult('abc'));
...