如何对依赖于另一个方法的方法进行单元测试

How to unit test a method that is dependent on another?

本文关键字：方法 单元测试 另一个 依赖于      更新时间：2023-09-26

我有一个React和Redux项目，我正试图用Chai测试框架进行单元测试。现在我正在为一个reducer写一个测试，这个reducer处理的几个动作调用helper方法。下面是一个例子:

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: []});
    }
  }
}

正如您所看到的，如果我测试这个方法，我也依赖于formsHelper.getFormsByProductId和formsHelper.addOrRemoveMnDisclosure方法来通过。我应该如何测试这个减速器/动作?我是否应该做一个单独的测试数据集，可以从这些方法返回时，某个产品。Id传递给这些方法?

这里有几个选项:您可以用nock拦截请求(如果它发出http调用)或用proxyquire模拟依赖关系。假设您正在将mocha与chai结合使用，这里有一些示例可以帮助您入门。

nock示例

const nock = require('nock');
describe('your test', () => {
  if('should do things', () => {
    nock('http://your-domain')
      .get('/forms/1') // <---- or any other resource
      .reply(200, { /* your response object for testing */ });
    /* Your regular test */
  });
});

proxyquire示例

const proxyquire = require('proxyquire');
describe('your test', () => {
  if('should do things', () => {
    const formsReducer = proxyquire.noCallThru().load('../reducers/forms', {
      formsHelper: {
        /* any keys you need mocked/replaced for your test */
        getFormsByProductId: id => return { /* mock response */ }
      }
    });
    /* Your regular test */
  });
});
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