jasmine无法模拟elasticsearch对象

Question

我正在使用yoeman，grunt，angular，grunt-jasmine，karma，el​​asticsearch实现一个应用程序。我需要为我的自定义服务（名称为elasticSearchService）编写测试，该服务调用elasticsearch（elasticsearch.angular.js）来搜索某些内容并返回到promise但我无法模拟该弹性搜索（esFactory）对象。

packages.json

"karma-jasmine": "^0.1.5",
"karma-phantomjs-launcher": "^0.1.4",

bower.json

"elasticsearch": "~2.4.1",

我的服务

angular
  .module('tagsearchFrontendApp')
  .factory('elasticSearchService', ['$q', 'esFactory',
    function ($q, esFactory) {

      var client = esFactory({
        host: 'localhost:9200'
      });

      var search = function (term, offset) {
        var deferred = $q.defer();
        var query = {
          'match': {
            '_all': term
          }
        };
        client.search({
          'index': 'recipes',
          'type': 'recipe',
          'body': {
            'size': 10,
            'from': (offset || 0) * 10,
            'query': query
          }
        }).then(function (result) {
          console.log(result);
          var ii = 0,
            hits_in, hits_out = [];
          hits_in = (result.hits || {}).hits || [];
          for (; ii < hits_in.length; ii++) {
            hits_out.push(hits_in[ii]);
          }
          deferred.resolve(hits_out);
        }, deferred.reject);

        return deferred.promise;
      };
....

我的测试

describe('elasticSearchService test', function () {

  var _elasticSearchService, rootScope, q;

  beforeEach(module('tagsearchFrontendApp'));
  beforeEach(inject(['$q', '$rootScope', 'esFactory', 'elasticSearchService', function ($q, $rootScope, esFactory, elasticSearchService) {

    _elasticSearchService = elasticSearchService;
    rootScope = $rootScope;
    q = $q;

    spyOn(esFactory, "search").andCallFake(function () {
      console.log("elasticsearch: fake search");
      var deferred = $q.defer();
      deferred.resolve('The fake search resolve');
      console.log(deferred.promise);
      return deferred.promise;
    });
  }]));

  it('search okay', function () {
    _elasticSearchService.search('Developer', 1).then(function(){
       ...
    });
  });
});

执行“grunt test”后，出现错误消息“search（）方法不存在”，尽管我的应用程序运行搜索功能可以使用elasicsearch工厂。你能帮我解决这个错误吗？

Answer 1

您可以在配置时使用$provide来通过模拟替换您的服务

describe('elasticSearchService test', function () {

    var esMock;
    var service;

    beforeEach(module('tagsearchFrontendApp') , function ($provide){
        $provide.factory('esFactory',function(){
            return function(){
                return esMock;
            }
        });
    });

    beforeEach(inject(function($q,elasticSearchService){
        esMock={
           search:function(){
            return $q.when('The fake search resolve');
           }
        };
        service=elasticSearchService;
    }));

    it('should search with elastic search',function(){
        spyOn(esMock, 'search').andCallThrough();
        _elasticSearchService.search('Developer', 1).then(function(result){
           ...
        });
    });
});

您可能需要致电$rootScope.$apply()来解决您的测试承诺，不确定。

Answer 2

由于您在原型函数中创建了esFactory的实例搜索功能。在你的间谍中做以下

spyOn(esFactory.prototype, 'search')...

你将开展业务。

另一个观察是没有必要注入q并在您的服务中延期。您只需返回esFactory客户端搜索功能创建的承诺，然后在您的处理程序中返回值而不是解析延迟。