摩卡测试蓝鸟支持的节点风格回调

Question

我正面临着通过运行mocha来通过测试的麻烦，这似乎已经过去了。

测试：

describe('.get()',function() { 

    it('should be called once',function() { 
     // => Need to spy on this 
     var callback = function(err,data) { 
      console.log('I am called'); 
      if (err) { 
       console.log('I am logging the error '+err); 
      } else { 
       console.log('I am logging the data '+data); 
      } 
     } 

     agentMock._response = {body:'something',headers:'headers'}; 

     // => Start Spying 
     var spy = sinon.spy(callback); 
     sinon.spy(agentMock,'get'); 

     baseRequest.get(spy); // refer (a) below 

     expect(agentMock.get).to.have.been.calledOnce; 
     expect(spy).to.have.been.calledOnce; 
     expect(spy).to.have.been.calledWith(null,'data'); 
    }); 
}); 

我想测试callback是否被称为与否。因此，我登录了回调的主体，标准输出也表明它正在被调用。

标准输出：

.get() 
    1) should be called once 
I am called 
I am logging the data something 


    0 passing (15ms) 
    1 failing 

    1) .get() should be called once: 
    AssertionError: expected spy to have been called exactly once, but it was called 0 times 

详情：

（一）baseRequest.get返回数据为bluebird承诺。这可以通过在nodeback到.get本身或通过在.get呼叫之后链接.then来使用。

BaseRequest.prototype.get = function(callback) { 
    // inner details 

    return invokeandPromisify(request,callback); 
} 

function invokeandPromisify(request, callback) { 
    return new Promise(function(resolve,reject) { 
    // Invoke the request 
    request.end(function(err,result) { 

     // Return the results as a promise 
     if (err || result.error) { 
      reject(err || result.error); 
     } else { 
      resolve(result); 
     } 
    }); 
    }).nodeify(callback); // to have a node style callback 
} 

是否发生，因为回调上，我想间谍传递给不同的功能（invokeandPromisify这里）和间谍丢了？我只是在解释这一点。

问候。

Answer 1

由于baseRequest#get返回一个承诺，我会做出断言的承诺得到解决之后。

参见下例：

it('should be called once',function(done) { 
    // => Need to spy on this 
    var callback = function(err,data) { 
     console.log('I am called'); 
     if (err) { 
      console.log('I am logging the error '+err); 
     } else { 
      console.log('I am logging the data '+data); 
     } 
    } 

    agentMock._response = {body:'something',headers:'headers'}; 

    // => Start Spying 
    var spy = sinon.spy(callback); 
    sinon.spy(agentMock,'get'); 

    baseRequest.get(spy).finally(function() { 
     expect(agentMock.get).to.have.been.calledOnce; 
     expect(spy).to.have.been.calledOnce; 
     expect(spy).to.have.been.calledWith(null,'data'); 
     done(); 
    }); 

}); 

Answer 2

通过添加完成，您的测试应该设置为异步。然后在回调funtion调用来完成（）

请检查http://mochajs.org/#asynchronous-code