注射器已经创建。无法注册模块

时间:2014-07-23 00:38:59

标签: javascript angularjs

我是Angular JS的新宠,并试图以适当的TDD方式制作出一些东西,但在测试时我收到了这个错误:

  

注射器已经创建,无法注册模块!

这是我正在谈论的服务。

bookCatalogApp.service('authorService', ["$resource", "$q", function($resource, $q){

    var Author =$resource('/book-catalog/author/all',{},{
        getAll : { method: 'GET', isArray: true}
    });

    var authorService = {};

    authorService.assignAuthors = function(data){
        authorService.allAuthors = data;
    };

    authorService.getAll = function(){
        if (authorService.allAuthors)
            return {then: function(callback){callback(authorService.allAuthors)}}

        var deferred = $q.defer();
        Author.getAll(function(data){
            deferred.resolve(data);
            authorService.assignAuthors(data);
        });
        return deferred.promise;
    };

    return authorService;
}]);

这是对上述服务的测试

describe("Author Book Service",function(){
    var authorService;
    beforeEach(module("bookCatalogApp"));
    beforeEach(inject(function($injector) {
        authorService = $injector.get('authorService');
    }));

    afterEach(function() {
        httpBackend.verifyNoOutstandingExpectation();
        httpBackend.verifyNoOutstandingRequest();
    });

    describe("#getAll", function() {
        it('should get all the authors for the first time', function() {
            var authors = [{id:1 , name:'Prayas'}, {id:2 , name:'Prateek'}];

            httpBackend.when('GET', '/book-catalog/author/all').respond(200, authors);

            var promise = authorService.getAll();

            httpBackend.flush();
            promise.then(function(data){
                expect(data.length).toBe(2)
            });
        });

        it('should get all the authors as they have already cached', function() {
            authorService.allAuthors = [{id:1 , name:'Prayas'}, {id:2 , name:'Prateek'}];

            var promise = authorService.getAll();

            promise.then(function(data){
                expect(data.length).toBe(2)
            });
        });

    });
})

任何帮助将不胜感激。

3 个答案:

答案 0 :(得分:62)

如果您要调用module('someApp')inject($someDependency),则会收到此错误。

在致电module('someApp')之前,您必须拨打inject($someDependency)的所有电话。

答案 1 :(得分:7)

您使用注入功能错误。作为documentation状态, inject 函数已经实例化了$ injector的新实例。我的猜测是,通过将$ injector作为参数传递给inject函数,您要求它实例化$ injector服务两次。

只需使用 inject 传递您要检查的服务即可。在封面下, inject 将使用它实例化的$ injector服务来获取服务。

您可以通过将第二个 beforeEach 语句更改为:

来解决此问题
beforeEach(inject(function(_authorService_) {
    authorService = _authorService_;
}));

还有一点需要注意。传递给 inject 函数的参数authorService已用'_'包装,因此它的名称不会隐藏在 describe 函数中创建的变量。那也注入了注入documentation

答案 2 :(得分:1)

不确定这是原因,但您的beforeEach应该是这样的:

beforeEach(function() {
  inject(function($injector) {
    authorService = $injector.get('authorService');
  }
});