我们如何模拟redux thunk的实现。
文件中有thunk：-src/actions.js

export const getRequest = () => async dispatch => {
    return await dispatch(
            fetchRequestInfo(),
        );
};

export const getBanks = () => async dispatch => {
    const response = dispatch(getRequest());
    if (!!response) {
        dispatch(success());
    } else {
        dispatch(failure());
    }
};

在我的src/actions.spec.js中，我想模拟getRequest并简单地返回一个json数据，如：-

import * as actions from 'actions';

const mockReqResponse = async () => {
    return {data: '1123'};
};

const mockGetReq = jest.spyOn(actions, 'getRequest').mockImplementation(() => mockReqResponse);

describe('getBanks should work', async () => {
    const store = mockStore(); // mocked redux store
    await store.dispatch(action.getBanks());
})

代码流没有到达getRequest的模拟实现，即mockReqResponse。我做错了什么吗？