构造函数属性的存根方法

时间:2019-03-07 14:12:48

标签: typescript mocha twilio sinon chai

我正在尝试对使用twilio-node包发送SMS消息的功能进行单元测试。对于传递的参数和调用的时间,我正在尝试测试的函数是Twilio.prototype.messages.create

sendText.ts

const twilio = new Twilio('ACfakeName', 'SomeAuthToken');

// Need to stub this guy
try {
    await twilio.messages.create({body: 'something', to: `1234567890`, from: '1234567890' });
}
catch (e) {
   console.log('An error while sending text', e);
}

sendText.spec.ts

twilioCreateStub = sinon.stub(Twilio.prototype.messages, 'create');

it('should call twilio.messages.create() once', async () => {


        try {
            await sendText();
        }
        catch (e) {
            fail('This should not fail.')
        }
        expect(twilioCreateStub.callCount).to.equal(1);


});

以这种方式运行它会使callCount为0的测试失败。我不确定mocha如何运行这些代码,但是如果测试失败,它似乎不会显示任何日志。如果我删除了expect部分,则似乎正在调用真实的twilio.messages.create,因为我得到了以下日志:

An error while sending text { [Error: The requested resource /2010-04-01/Accounts/ACfakeName/Messages.json was not found]
  status: 404,
  message:
   'The requested resource /2010-04-01/Accounts/ACfakeName/Messages.json was not found',
  code: 20404,
  moreInfo: 'https://www.twilio.com/docs/errors/20404',
  detail: undefined }

我也尝试过sinon.createStubInstance并获得类似结果。我看不到任何迹象表明我正在使用深度嵌套的方法。

1 个答案:

答案 0 :(得分:2)

我会将Twillio的实例注入您的班级。然后在测试时,您可以创建该类的存根:

class myClass{
    constructor(twillio){
        this.twilio = twilio;
    }

    //functions using twillio here
}

然后您可以创建一个存根:

const twilioStub = {messages: {create: sinon.stub()}}; //You might want to give this more functions and put it in a seperate file
myClass = new MyClass(twiliostub);
//call function on myClass using twilio

expect(twilioStub.messages.create.callCount).to.equal(1);