测试Karma中的角服务:相同的测试,不同的结果

我正在尝试用Karma测试Angular服务,结果很奇怪,所以我做了两个相同的测试,看看是否能得到相同的结果,但我没有:

describe('Profile Data Service', function() {
  var LoginData, rootScope, $httpBackend;
  beforeEach(module('myApp'));

  describe('get profile data', function() {
    beforeEach(inject(function(_LoginData_, $rootScope, _$httpBackend_) {
      LoginData = _LoginData_;
      LoginData.username= "jsmith";
      LoginData.token = "token";

      rootScope = $rootScope;

      $httpBackend = _$httpBackend_;

    }));

    it('should get profile data on instantiation', inject(function(ProfileDataService) {
      $httpBackend.expect('POST', 'http://mytestserver.com/api/', {
        params: [{
          username: "jsmith",
          token: "token",
          method: "getProfile"
        }]
      })
      .respond({
        result: {
          address: "111 Main St."
          city: "Los Angeles",
          state: "CA"
        }
      });
      $httpBackend.flush();
      expect(ProfileDataService.profileData.address).toMatch("111 Main St.");
    }));

    it('should get profile data on instantiation', inject(function(ProfileDataService) {
      $httpBackend.expect('POST', 'http://mytestserver.com/api/', {
        params: [{
          username: "jsmith",
          token: "token",
          method: "getProfile"
        }]
      })
      .respond({
        result: {
          address: "111 Main St."
          city: "Los Angeles",
          state: "CA"
        }
      });
      $httpBackend.flush();
      expect(ProfileDataService.profileData.address).toMatch("111 Main St.");
    }));
  });
});

第一个测试通过了,但第二个测试表明profileData未定义。它们是相同的测试。我假设每个 it ProfileDataService正在重新初始化,但情况可能并非如此。如果不是这样,我该如何创建单独的测试,以便销毁我的服务并为每个测试用例重新初始化?

该服务的逻辑相当简单:

(function() {
  'use strict';
  angular.module('servicesModule')
  .service('ProfileDataService', ProfileDataService);

  ProfileDataService.$inject = ["$http", "$q", "LoginData", "CacheFactory"];

  function ProfileDataService($http, $q, LoginData, CacheFactory) {
    var ProfileDataService = this;
    (function() {
      init();
    })();

    function init() {
      getProfile().then(function(profileData) {
        ProileDataService.profileData = profileData;
      });
    }

    function getProfile() {
      var deferred = $q.defer();
      var data = {
        params: [{
          username: LoginData.username,
          token: LoginData.token,
          method: "getProfile"
        }]
      };
      var profileDataCache = CacheFactory.get('profileDataCache');

      if (profileDataCache.get('profileData') && !invalidateCache) {
        deferred.resolve(profileDataCache.get('profileData'));
      }
      else {
        $http.post('http://mytestserver.com/api/', data)
        .success(function(data) {
          profileDataCache.put('profileData', response.result);
          deferred.resolve(data.result);
        });
      }
      return deferred.promise;
    }
  }
})();

我还应该注意到,我已经尝试添加 rootScope.$digest()

angular-cache 。我忘了提到我正在使用缓存插件。这就是我问题的原因。在创建了一个plunker并看到我在相同的测试中得到了一致的结果后,我知道有一些事情我没有意识到。由于我的缓存逻辑,第二个测试没有发出POST请求。