javascript - 如何正确地对 Angular 指令进行单元测试

Question

我正在尝试测试 Angular 指令，但一直遇到以下错误:

Error: Unexpected request: GET /api/players/info

我相信这是因为在我的指令定义对象中引用了我的 Controller ，但我不确定如何处理它。下面是我的指令，然后是我的测试:

playerInfo.directive.js:

'use strict';

angular.module('gameApp')
  .directive('playerInfo', playerInfo);

function playerInfo() {
  var directive = {
    link: link,
    restrict: 'E',
    templateUrl: '/app/player/playerInfo.directive.html',
    controller: 'PlayerInfoController',
    controllerAs: 'playerInfo'
  };
  return directive;

  function link(scope, element) {
    var address =   angular.element(element[0].getElementsByClassName('blur'));
    address.on('click', function() {
      address.css({'-webkit-filter': 'none'});
    });
  }
}

playerInfoSpec.js:

'use strict';

describe('playerInfo directive', function() {
  var element;
  var scope;

  beforeEach(module('gameApp'));

  beforeEach(inject(function($templateCache) {
    var templateUrl = '/app/player/playerInfo.directive.html';
    var asynchronous = false;
    var req = new XMLHttpRequest();
    req.onload = function() {
      $templateCache.put(templateUrl, this.responseText);
    };
    req.open('get', '/base' + templateUrl, asynchronous);
    req.send();
  }));

  beforeEach(inject(function($rootScope, $compile) {
    scope = $rootScope.$new();
    element = '<player-info></player-info>';
    element = $compile(element)(scope);
  }));

  it('should replace the element with the appropriate content', function() {
    scope.$digest();
    expect(element.html()).toContain("Score:");
  });
});

我的 Controller 使用注入(inject)服务向 /api/players/info 发送 GET 请求，这就是为什么我认为此错误与我的 Controller 引用有关在我的指令定义对象中。

Answer 1

您的 Controller 正在远程调用/api/players/info。在进行单元测试时(我猜你正在使用 Karma 和 Jasmine)，你将不得不使用 ngMock 模块和 $httpBackend 服务来模拟远程调用。

'use strict';

describe('playerInfo directive', function() {
  var element;
  var scope;
  var $httpBackend

  beforeEach(module('gameApp'));

  beforeEach(inject(function($templateCache) {
    var templateUrl = '/app/player/playerInfo.directive.html';
    var asynchronous = false;
    var req = new XMLHttpRequest();
    req.onload = function() {
      $templateCache.put(templateUrl, this.responseText);
    };
    req.open('get', '/base' + templateUrl, asynchronous);
    req.send();
  }));

  beforeEach(inject(function($rootScope, $compile, _$httpBackend_) {
    scope = $rootScope.$new();
    element = '<player-info></player-info>';
    element = $compile(element)(scope);
    $httpBackend = _$httpBackend_;
    $httpBackend.whenGET('/api/players/info').respond(200, '');
  }));

  it('should replace the element with the appropriate content', function() {
    scope.$digest();
    expect(element.html()).toContain("Score:");
    $httpBackend.flush()
  });
});

有完整的文档 here
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