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我正在尝试使用proxyquire单元测试我的 Redux 减速器。我需要在我的测试中替换一个函数的功能，但保留另一个函数的原始功能，根据proxyquire's文档这是可能的。

formsReducer.test.js：

import { expect } from 'chai';
import * as types from '../constants/actionTypes';
import testData from '../data/TestData';
import proxyquire from 'proxyquire';
describe('Forms Reducer', () => {
    describe('types.UPDATE_PRODUCT', () => {
        it('should get new form blueprints when the product changes', () => {
            //arrange
            const initialState = {
                blueprints: [ testData.ipsBlueprint ],
                instances:  [ testData.basicFormInstance ]
            };
            //use proxyquire to stub call to formsHelper.getFormsByProductId
            const formsReducerProxy = proxyquire.noCallThru().load('./formsReducer', {
              '../utils/FormsHelper': {
                getFormsByProductId: () => { return initialState.blueprints; }
              }
            }).default;
            const action = {
                type: types.UPDATE_PRODUCT,
                stateOfResidence: testData.alabamaObject,
                product: testData.basicProduct
            };
            //act
            const newState = formsReducerProxy(initialState, action);
            //assert
            expect(newState.blueprints).to.be.an('array');
            expect(newState.blueprints).to.equal(initialState.blueprints);
        }); 
    });
});

formsReducer.js：

import * as types from '../constants/actionTypes';
import objectAssign from 'object-assign';
import initialState from './initialState';
import formsHelper from '../utils/FormsHelper';
export default function formsReducer(state = initialState.forms, action) {
  switch (action.type) {
    case types.UPDATE_PRODUCT: {
        let formBlueprints = formsHelper.getFormsByProductId(action.product.id);
        formBlueprints = formsHelper.addOrRemoveMnDisclosure(formBlueprints, action.stateOfResidence.id);
        return objectAssign({}, state, {blueprints: formBlueprints, instances: []});
    }
}

我需要替换的功能formsHelper.getFormsByProductId()但保留的原始功能formsHelper.addOrRemoveMnDisclosure()- 正如您在proxyquire块中看到的那样，我只是替换getFormsByProductId()功能。但是，当我这样做时，会出现以下错误：TypeError: _FormsHelper2.default.addOrRemoveMnDisclosure is not a function. 看起来是 babel 或我export default的 for FormHelper 的问题。

FormsHelper 的导出如下所示：

export default class FormsHelper { ...methods and whatnot }.

我该如何解决这个问题？

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