单元测试Angular中$ sce.trustAsHtml的输出

我正在Angular中编写一个REST应用程序,我想为它编写单元测试(当然!).我有一个控制器,它从json中的REST服务获取博客文章列表,并将摘要放入$ scope,因此我可以在视图中显示它们.

起初,博客帖子只是显示为文本

Blog body

单元测试时会出现问题.我试图用一些HTML模拟一个json响应,然后测试我的控制器是否正确处理HTML.这是我的代码:

调节器

.controller( 'HomeCtrl', function HomeController( $scope, $http, $sce ) {
    $scope.posts = {};
    $http.get('../drupal/node.json').success(function (data) {
        var posts;
        posts = data.list;

        for(var i = 0; i < posts.length; i ++) {
            posts[i].previewText = $sce.trustAsHtml(posts[i].body.summary);
            posts[i].created = posts[i].created + '000'; // add milliseconds so it can be properly formatted 
        }
        $scope.posts = posts;
    });
})

单元测试

describe('HomeCtrl', function() {
    var $httpBackend, $rootScope, $sce, createController;

    beforeEach(inject(function ($injector) {
        // Set up the mock http service responses
        $httpBackend = $injector.get('$httpBackend');

        // Get hold of a scope (i.e. the root scope)
        $rootScope = $injector.get('$rootScope');
        // The $controller service is used to create instances of controllers
        var $controller = $injector.get('$controller');

        $sce = $injector.get('$sce');

        createController = function() {
            return $controller('HomeCtrl', {
                '$scope': $rootScope
            });
        };
    }));

    it('should get a list of blog posts', function() {
        var rawResponse = {
            "list": [
                {
                    "body": {
                        "value": "\u003Cp\u003EPost body.\u003C\/p\u003E\n",
                        "summary": "\u003Cp\u003ESummary.\u003C\/p\u003E\n"
                    },
                    "created": "1388415860"
                }
            ]};
        var processedResponse = [{
                "body": {
                    "value": "\u003Cp\u003EPost body.\u003C\/p\u003E\n",
                    "summary": "\u003Cp\u003ESummary.\u003C\/p\u003E\n"
                },
                "created": "1388415860000",
            previewText: $sce.trustAsHtml("\u003Cp\u003ESummary.\u003C\/p\u003E\n")
        }];

        $httpBackend.when('GET', '../drupal/node.json').respond(rawResponse);
        $httpBackend.expectGET("../drupal/node.json").respond(rawResponse);
        var homeCtrl = createController();
        expect(homeCtrl).toBeTruthy();
        $httpBackend.flush();
        expect($rootScope.posts).toEqual(processedResponse);
    });
});

当我通过Karma测试运行器运行上述内容时,我收到以下响应:

Chrome 31.0.1650 (Windows) home section HomeCtrl should get a list of blog posts FAILED
    Expected [ { body : { value : '
Post body.
    ', summary : '
Summary.
    ' }, created : '1388415860000', previewText : { $$unwrapTrustedValue : Function } }          ] to equal [ { body
: { value : '
Post body.
    ', summary : '
Summary.
    ' }, created : '1388415860000', previewText : { $$unwrapTrustedValue : Function } }     ].

我怀疑问题是由于$sce.trustAsHtml返回包含函数的对象而不是字符串的事实.

我的问题是,首先,我是否以正确的方式处理这个问题？

其次,如果是这样,我该如何测试输出$sce.trustAsHtml？