模块功能上的Sinon存根

Question

我正在尝试测试一个es6类，但我不知道如何用sinon存根一个函数模块。测试不是sm下的覆盖线。callSoap函数

我试试这个：

module.js

 function soapModule(){
      this.callSoap = (id) => {
         ....//some code
          return new Promise((resolve,reject) =>{
             return resolve("whatever");
          }
      }
 }

index.js(这是模块的索引)

 "use strict";

 var soapModule = require('./module/module');

 module.exports.soapModule = soapModule;

my-class.js

import {soapModule} from "soap-client"

export default class MyClass {

   constructor(){
     console.log("instance created");
   }

   myMethod(id){
     let sm = new soapModule();

     return sm.callSoap(id)
            .then(result => {
                console.log(result);
            }).catch(e => {
                console.log("Error :" + e);
            })
   }
}

test.js

import MyClass from "../src/my-class";
import {soapModule} from "soap-client";
import sinon from 'sinon';

describe("Test MyClass",()=>{

    let myclass;
    let soap;
    let stub;

    before(()=>{
        myclass = new MyClass();
        soap = new soapModule();
        stub = sinon.stub(soap,'callSoap');
    });

    it("test a", ()=>{
        let fakeout = {
            resp : "tada!"
        }
        stub.resolves(fakeout);
        myclass.myMethod(1);
    });
});

我尝试在soapModule上存根，但生成了以下错误:

无法存根不存在的自己的属性call Soap

Answer 1

我还注意到，您已经存根了肥皂模块实例的调用Soap方法。它需要是 soapModule 原型上的存根，因此当您在 myMethod 中创建实例时，它具有存根版本。

import MyClass from "../src/my-class";
import {soapModule} from "soap-client";
import sinon from 'sinon';

describe("Test MyClass",()=>{

    let myclass;
    let stub;
    let stubP;

    before(()=>{
        myclass = new MyClass();
        stub = sinon.stub(soapModule.prototype, 'callSoap');
        stubP = sinon.stub(); // second stub to be used as a promise
        stub.returns(stubP);
    });

    after(() => {
      stub.restore();
    });

    it("test a", ()=>{
        let fakeout = {
            resp : "tada!"
        }
        myclass.myMethod(1);
        stubP.resolves(fakeout);
    });
});

Answer 2

最后，我必须将模块更改为ECMAScript 6语法。

所以，我的新模块看起来像这样：

module.js

  export function callSoap(id){
     ....//some code
      return new Promise((resolve,reject) =>{
         return resolve("whatever");
      }
  }

当我更改为ECMAScript 6语法时，我实现了babel-cli以编译为EC5，因此索引从：

   var soapModule = require('./module/module'); 

到

    var soapModule = require('./lib/module'); //<-- this is the build output folder

然后，单元测试如下所示：

import MyClass from "../src/my-class";
import {soapModule} from "soap-client";
import sinon from 'sinon';

describe("Test MyClass",()=>{

let myclass;
let stub;

before(()=>{
    myclass = new MyClass();
    stub = sinon.stub(soap,'callSoap');
});

it("test a", ()=>{
    let fakeout = {
        resp : "tada!"
    }
    stub.resolves(fakeout);
    myclass.myMethod(1).then(result =>{
          console.log(result) //<----- this is the fakeout
       }
    )
  });
});