sinon.stub不扼杀原始的方法
当为我的下面的代码S3resizer编写testing时，存根S3getStub在我调用testedModule时似乎不工作，我得到了来自mocha AssertionError: expected stub to have been called at least once, but it was never called的响应AssertionError: expected stub to have been called at least once, but it was never called 。
为什么S3resizer_get不被S3resizer_get ？
s3Handler ：
'use strict'; var s3 = new (require('aws-sdk')).S3(); var S3Handler = {}; S3Handler._get = function (bucketName, imgName, callback) { var params = { Bucket: bucketName, Key: imgName }; s3.getObject(params, function (error, data) { if (error) { console.log("Error, %s", error); callback(error, null); } console.log("good data"); callback(null, data); }); }; module.exports = S3Handler;
S3resizer ：
/** * This function is called when the protocol defined in index.js is "s3:". */ 'use strict'; var async = require('async'); var S3 = require("./S3Handler"); var S3get = S3._get; var S3put = S3._put; var read = require("./readDirectory"); var readDirFile = read._get; var readDirCont = read._getContent; var rs = require("./resizer").resize; var _sqs = require("./sqsHandler"); var sqsSend = _sqs._sendMessage; var S3resizer = {}; S3resizer.rs = function (imgName, bucketName) { S3get(bucketName, imgName, function (error, data) {console.log(data);}); }; module.exports = S3resizer;
tests ：
var chai = require('chai'); var sinonChai = require("sinon-chai"); var expect = chai.expect; var extend = require('lodash').extend; var sinon = require('sinon'); chai.use(sinonChai); var proxyquire = require('proxyquire').noPreserveCache(); var url = require('url'); var mockDir = require('mock-fs'); describe("S3resizer", function () { var testedModule, fakeResponse, fakeFiles, S3getStub, rsStub, readDirFileStub, readDirContStub, S3putStub, sqsCreateStub, sqsSendStub, cbSpy, callbSpy, imgName, bucketName, sizesObj, imageType, obj; before(function () { S3getStub = sinon.stub(); rsStub = sinon.stub(); readDirContStub = sinon.stub(); readDirFileStub = sinon.stub(); S3putStub = sinon.stub(); sqsCreateStub = sinon.stub(); sqsSendStub = sinon.stub(); cbSpy = sinon.spy(); callbSpy = sinon.spy(); testedModule = proxyquire('../S3resizer', { './S3Handler': { _get: S3getStub, _put: S3putStub }, './readDirectory': { _get: readDirFileStub, _getContent: readDirContStub }, './resizer': { resize: rsStub }, './sqsHandler': { _sendMessage: sqsSendStub }, }); imgName = "Whatever"; bucketName = "Chappie"; sizesObj = [ { width: 800, height: 800, name: 'large' }, { width: 500, height: 500, name: 'medium' }, { width: 200, height: 200, name: 'small' }, { width: 45, height: 45, name: 'thumbnail'} ]; imageType = "png"; obj = { "event":"re-sized", "message": { "url":"S3://bucketname/images/908798", "sizes":["large","medium","small","thumbnail"] } }; fakeResponse = {Body: 'image content'}; fakeFiles = ["thumbnail_Whatever", "small_Whatever", "medium_Whatever", "large_Whatever"]; }); it("calls callback with message 'Done'", function () { S3getStub.callsArgWith(2, null, fakeResponse); testedModule.rs(imgName, bucketName); expect(S3getStub).has.been.called; });
}）;
从精美的手册 ：
因此请在testing文件中的require语句中指定它
你告诉proxyquire为./S3Handler捕获require，实际上S3Resizer正在加载./S3Handler.js （包括.js ）。 这不完全一样。
这工作。 为了避免使用caching版本并重构代码以使用require模块的全局覆盖，我必须新鲜地要求被测模块。
describe("S3resizer succesfull call", function () { // To avoid having to refactor code with a global override of the require method and using the cached versions from previous tests, freshly require the modules and inject in stubs. var S3 = require("../S3Handler"); var read = require("../readDirectory"); var _resizer= require("../resizer"); var _sqs = require("../sqsHandler"); var testedModule, fakeResponse, fakePutMessage, fakeSqsMessage, fakeFiles, S3getStub, rsStub, readDirFileStub, readDirContStub, S3putStub, sqsSendStub, cbSpy, callbSpy, imgName, bucketName, sizesObj, imageType, obj; before(function () { S3getStub = sinon.stub(S3, "_get"); rsStub = sinon.stub(_resizer, "resize"); readDirContStub = sinon.stub(read, "_getContent"); readDirFileStub = sinon.stub(read, "_get"); S3putStub = sinon.stub(S3, "_put"); sqsSendStub = sinon.stub(_sqs, "_sendMessage"); cbSpy = sinon.spy(); callbSpy = sinon.spy(); testedModule = proxyquire('../S3resizer', { './S3Handler': { _get: S3getStub, _put: S3putStub }, './readDirectory': { _get: readDirFileStub, _getContent: readDirContStub }, './resizer': { resize: rsStub }, './sqsHandler': { _sendMessage: sqsSendStub } }); imgName = "Whatever"; bucketName = "Chappie"; sizesObj = [ { width: 800, height: 800, name: 'large' }, { width: 500, height: 500, name: 'medium' }, { width: 200, height: 200, name: 'small' }, { width: 45, height: 45, name: 'thumbnail'} ]; imageType = "png"; obj = { "event":"re-sized", "message": { "url":"S3://bucketname/images/908798", "sizes":["large","medium","small","thumbnail"] } }; fakeResponse = {Body: 'image content'}; fakePutMessage = {messageId: "1223abc"}; fakeSqsMessage = {BinaryValue: "123"}; fakeFiles = ["thumbnail-Whatever", "small-Whatever", "medium-Whatever", "large-Whatever"]; S3getStub.callsArgWith(2, null, fakeResponse); rsStub.callsArgWith(4, null); readDirFileStub.callsArgWith(1, null, fakeFiles); readDirContStub.callsArgWith(2, null, fakeResponse); S3putStub.callsArgWith(5, null, fakePutMessage); sqsSendStub.callsArgWith(1, null, fakeSqsMessage); testedModule.rs(imgName, bucketName, sizesObj, imageType, obj, function () { cbSpy.apply(null, arguments); }); }); after(function () { S3._get.restore(); _resizer.resize.restore(); read._getContent.restore(); read._get.restore(); S3._put.restore(); _sqs._sendMessage.restore(); }); };