Sinon.js-试图监视console.log，但它已经被包装好了

Question

我刚开始写节点测试.这是我第一次尝试编写gulp插件的单元测试：

var chai = require('chai');
var spy = require('chai-spies');
var es = require('event-stream');
var File = require('vinyl');
var mock = require('mock-fs');
var sinon = require('sinon');
var sinonChai = require("sinon-chai");
//var rewire = require("rewire");
//var myModule = rewire("./test.js");
var es = require('event-stream');

chai.should();
chai.use(sinonChai);

describe('gulp-newy', function() {
  var fs = require('fs');
    var fakeFile, pspy;

    beforeEach(function() {
        //myModule.__set__('__dirname', "/home/one");
        mock({
            __dirname: mock.directory({
                mode: 0755,
                items: {
                file1: 'file one content',
                file2: new Buffer([8, 6, 7, 5, 3, 0, 9])
                }
            })
        });

    });
    afterEach(mock.restore);


    describe('get files', function() {
        it('should do something', function(done) {
        mock({
            foo: mock.file({
            content: 'nothing',
            mtime: new Date(Date.now())
            }),
            bar: mock.file({
            content: 'nothing',
            mtime: new Date(1,1)
            })
        });
        fakeFile = new File({
           contents: new Buffer('foo'),
           history: ['foo']
        });


       var bar = function(dest) { return 'bar' };
       spy1 = sinon.spy(console, "log");
       stream = newy(bar);
       stream.write(fakeFile);
       stream.on('data', function() {
           console.log("sss");
       });
       spy1.should.have.been.called();
       done();
       });
    });
});

我得到了TypeError: Attempted to wrap log which is already wrapped，但我不知道它在我的间谍之前被包裹在哪里。

Answer 1

我在用摩卡--看.哪个疗程永远不会结束。因为这个..。另一个间谍存在。答案是Cleaning up sinon stubs easily

Answer 2

使用sinon时，您需要确保在每次测试后恢复存根\模拟。如果你不这样做，它们仍然是存根，如果你试图在一个不同的测试中再次对它们进行存根处理，它就会大喊要再次包装一个方法。有很多方法可以做到这一点，在沙箱中包含所有存根，或者只是在"after“子句中进行还原。例如：

describe('This is a test', ()=> {


       before(()=> {
            sinon.stub(myObject,'myMethod', ()=> {
                return 'stubbed result';
            })
        });
        it('should stub my method', ()=>{
            expect(myObject.myMethod).to.be.equal('stubbed result');
        });
        after(()=> {
            //important part
            myObject.myMethod.restore();
        });
    })