单元测试Karma - 错误：意外请求：GET“......”

Question

我正在尝试使用Karma-jasmine对使用Angular构建的项目进行单元测试。

当我运行测试时，我收到此错误：

Error: Unexpected request: GET assets/l10n/en.js

这是我的spec文件：

describe('test Overview Factory', function() {
  var overviewFactory, api_url, $q, httpBackend, $scope, response;

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

  beforeEach(inject(function(_OverviewFactory_, _$q_, _$httpBackend_, _$rootScope_, API_URL) {
    $q = _$q_;
    api_url = API_URL;
    overviewFactory = _OverviewFactory_;
    httpBackend = _$httpBackend_;
    $scope = _$rootScope_.$new();
    httpBackend.whenGET('url', undefined, {
      Authorization: "Bearer token"
    }).respond();

  }));

  // Verify our factory exists
  it('should be defined', function() {
    expect(overviewFactory).toBeDefined();
  });

  it('should gets totals from api', function() {
    httpBackend.expectGET('url').respond(200);

    httpBackend.flush();
  });
});

如果我删除了行httpBackend.flush();，它就能正常工作。我做错了什么？