首页 \ 问答 \ Backbone - 使用Jasmine测试一个简单的模型会导致TypeError(Backbone - testing a simple model using Jasmine results in TypeError)

Backbone - 使用Jasmine测试一个简单的模型会导致TypeError(Backbone - testing a simple model using Jasmine results in TypeError)

 我试图学习使用Jasmine测试基于Backbone的应用程序的方法。 为此，我从这里获取了一些示例代码： http ： //msdn.microsoft.com/en-us/scriptjunkie/hh377172 。  
    Photo = new Backbone.Model.extend({
        defaults:{
            title: 'Another photo!',
            tags:  ['untagged'],
            location: 'home',
            src: 'placeholder.jpg'
        },
        initialize: function(){
            console.log('this model has been initialized');
            this.bind("change:title", function(){
                var title = this.get("title");
                console.log("My title has been changed to.." + title);
            });
        },

        setTitle: function(newTitle){
            this.set({ title: newTitle });
        }
    });
 
 然后编写测试规范如下：  
    describe("Photo Model", function() {
        it("verifies title", function() {
        var myPhoto = new Photo();
        myPhoto.set({ title: "On the beach" });   
        expect(myPhoto.get("title"))
            .toEqual("On the beach");
        });
    });
 
 在运行它时，测试因TypeError而失败  
    TypeError: Object [object Object] has no method 'apply'
        at new <anonymous> (http://localhost:88/backbone/WebClient-Backbone2/js/backbone.js:1103:41)
        at [object Object].<anonymous> (http://localhost:88/backbone/WebClient-Backbone2/test/spec.js:28:16)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1001:15)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2070:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2215:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)     

I was trying to learn the ways of testing Backbone-based app using Jasmine. For this, I picked up some sample code from here: http://msdn.microsoft.com/en-us/scriptjunkie/hh377172. 
    Photo = new Backbone.Model.extend({
        defaults:{
            title: 'Another photo!',
            tags:  ['untagged'],
            location: 'home',
            src: 'placeholder.jpg'
        },
        initialize: function(){
            console.log('this model has been initialized');
            this.bind("change:title", function(){
                var title = this.get("title");
                console.log("My title has been changed to.." + title);
            });
        },

        setTitle: function(newTitle){
            this.set({ title: newTitle });
        }
    });
 
Then wrote the test spec as follows: 
    describe("Photo Model", function() {
        it("verifies title", function() {
        var myPhoto = new Photo();
        myPhoto.set({ title: "On the beach" });   
        expect(myPhoto.get("title"))
            .toEqual("On the beach");
        });
    });
 
While running it, the test fails with TypeError 
    TypeError: Object [object Object] has no method 'apply'
        at new <anonymous> (http://localhost:88/backbone/WebClient-Backbone2/js/backbone.js:1103:41)
        at [object Object].<anonymous> (http://localhost:88/backbone/WebClient-Backbone2/test/spec.js:28:16)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1001:15)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2070:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)
        at [object Object].start (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1743:8)
        at [object Object].execute (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:2215:14)
        at [object Object].next_ (http://localhost:88/backbone/WebClient-Backbone2/test/lib/jasmine/jasmine.js:1790:31)     

原文：https://stackoverflow.com/questions/8543315

更新时间：2023-06-06 09:06

最满意答案

 除了改变你的== （严格平等）之外并不多。 但是会与正常的平等一起工作。  
 不知道你做错了什么，因为这段代码工作正常。  
 我会做的是拥有像这样的JSON响应  
 "{ error: true, }" "{ error: false, data: yourDataSentByTheServer! }"这样你只需要检查JSON响应中是否有错误属性。  
 
 
  
  function stringType(){
  const responseData = 'hello';
  if(typeof(responseData) === 'string')
  {
    console.log('got api call ' + responseData);
    alert('test = ' + responseData);
  }
  else
  {
    console.log('got api call ' + responseData);
    alert(responseData);
  }
}

function objType(){
  const responseData = { 1:'hello', 2: 'koko' }
  if(typeof(responseData) === 'string')
  {
    console.log('got api call ' + responseData);
    alert('test = ' + responseData);
  }
  else
  {
    console.log('got api call ' + responseData);
    alert(responseData);
  }
} 
  <button onClick="stringType();">Click me for string</button>
<button onClick="objType();">Click me for obj</button> 
  
 

Other than changing your == for === (strict equality) not much. But will work with normal equality.  
Dont know what you're doing wrong, because this code works just fine. 
What I would do instead is having a JSON response like so: 
"{
    error: true,
}"


"{
    error: false,
    data: yourDataSentByTheServer!
}"
 
That way you only need to check if there's an error property inside your JSON response. 
 
 
  
  function stringType(){
  const responseData = 'hello';
  if(typeof(responseData) === 'string')
  {
    console.log('got api call ' + responseData);
    alert('test = ' + responseData);
  }
  else
  {
    console.log('got api call ' + responseData);
    alert(responseData);
  }
}

function objType(){
  const responseData = { 1:'hello', 2: 'koko' }
  if(typeof(responseData) === 'string')
  {
    console.log('got api call ' + responseData);
    alert('test = ' + responseData);
  }
  else
  {
    console.log('got api call ' + responseData);
    alert(responseData);
  }
} 
  <button onClick="stringType();">Click me for string</button>
<button onClick="objType();">Click me for obj</button>

Backbone - 使用Jasmine测试一个简单的模型会导致TypeError(Backbone - testing a simple model using Jasmine results in TypeError)

最满意答案

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