麻烦使用templateUrl的单元测试指令

Question

我在使用单元测试指令时遇到了麻烦templateUrl.

这是关于AngularJS测试的这个很棒的教程[1],它甚至还有一个与之配合的Github回购[2]

所以我分叉了它[3]并进行了以下更改:

在directives.js我创建了两个新指令:

.directive('helloWorld', function() {
    return {
      restrict: 'E',
      replace: true,
      scope:{},
      template: '<div>hello world!</div>',
      controller: ['$scope', function ($scope) {}]
    }
})

.directive('helloWorld2', function() {
    return {
      restrict: 'E',
      replace: true,
      scope:{},
      templateUrl: 'mytemplate.html',
      controller: ['$scope', function ($scope) {}]
    }
})

我改变了test/unit/directives/directivesSpecs.js以便它将模板加载到$ templateCache中,然后为新指令添加了两个测试:

//
// test/unit/directives/directivesSpec.js
//
describe("Unit: Testing Directives", function() {

  var $compile, $rootScope, $templateCache;

  beforeEach(angular.mock.module('App'));

  beforeEach(inject(
    ['$compile','$rootScope', '$templateCache', function($c, $r, $tc) {
      $compile = $c;
      $rootScope = $r;

      //Added $templateCache and mytemplate
      $templateCache = $tc;
      $templateCache.put('mytemplate.html', '<div>hello world 2!</div>');
    }]
  ));

  //This was already here
  it("should display the welcome text properly", function() {
    var element = $compile('<div data-app-welcome>User</div>')($rootScope);
    expect(element.html()).to.match(/Welcome/i);
  });


  //Added this test - it passes
  it("should render inline templates", function() {
    var element = $compile('<hello-world></hello-world>')($rootScope);
    expect(element.text()).equal("hello world!");
  });

  //Added this test - it fails
  it("should render cached templates", function() {
    var element = $compile('<hello-world2></hello-world2>')($rootScope);
    expect(element.text()).equal("hello world 2!");
  });

});

最后一次测试失败,因为Angular不会像它应该那样编译模板.

$ grunt test:unit
Running "karma:unit" (karma) task
INFO [karma]: Karma v0.10.10 server started at http://localhost:9876/
INFO [launcher]: Starting browser Chrome
INFO [Chrome 35.0.1916 (Linux)]: Connected on socket ChISVr0ZABZ1fusdyv3m
Chrome 35.0.1916 (Linux) Unit: Testing Directives should render cached templates FAILED
    expected '' to equal 'hello world 2!'
    AssertionError: expected '' to equal 'hello world 2!'
Chrome 35.0.1916 (Linux): Executed 18 of 18 (1 FAILED) (0.441 secs / 0.116 secs)
Warning: Task "karma:unit" failed. Use --force to continue.

Aborted due to warnings.

我很确定这应该有效.至少,它与@SleepyMurth在[4]提出的解决方案非常相似.

但是我觉得我已经达到了解我目前AngularJS知识出了什么问题的极限.

救命!:-)

[1] http://www.yearofmoo.com/2013/01/full-spectrum-testing-with-angularjs-and-karma.html

[2] https://github.com/yearofmoo-articles/AngularJS-Testing-Article/

[3] https://github.com/tonylampada/AngularJS-Testing-Article

[4] 单元测试带有templateUrl的AngularJS指令

Answer 1

问题

当templateUrl指定时,模板是使用取出的$http(即使对于高速缓存的模板,其中$http供应来自$templateCache).出于这个原因,需要有一个$ digest循环来$http承诺使用模板内容解析并由指令处理.

解决方案

由于promises在$ digest循环期间得到解决(并且因为我们在"Angular context"之外),我们需要$rootScope.$digest()在评估断言之前手动调用.
因此,最后一次测试应该像这样修改:

it("should render cached templates", function() {
    var element = $compile('<hello-world2></hello-world2>')($rootScope);
    $rootScope.$digest();   // <-- manually force a $digest cycle
    expect(element.text()).toBe(tmplText);
});

另见这个简短的演示.