AngularJS:如何测试以元素为重点的指令? [英] AngularJS: how to test directive which gives focus to element?

问题描述

注意:建议的链接是有关服务问题的答案，并且未给出有关如何解决此问题的明确说明

我正在尝试为我的简单AngularJS autofocus指令设置业力测试:

I'm trying to setup a karma test for my simple (and working) AngularJS autofocus directive:

app.directive('autofocus', function ($timeout) {
  return {
    replace: false,
    link: function (scope, element, attr) {
      scope.$watch(attr.autofocus,
        function (value) {
          if (value) {
            $timeout(function () {
              element[0].focus();
              console.log('focus called');
            });
          }
        }
      );
    }
  };
});

这是我当前的测试:

describe('The autofocus directive', function () {
  var timeout;
  beforeEach(module('myApp'));
  beforeEach(inject(function($timeout) {
    timeout = $timeout;
  }));

  it('should set focus to first autofocus element', function () {
    var form = angular.element('<form />');
    var input1 = angular.element('<input type="text" name="first" />');
    var input2 = angular.element('<input type="text" name="second" autofocus="true" />');
    form.append(input1);
    form.append(input2);
    spyOn(input2[0], 'focus');
    timeout.flush();
    expect(input2[0].focus).toHaveBeenCalled();
  });

这是karma的(FAILED)输出:

This is the (FAILED) output from karma:

$ node_modules/karma/bin/karma开始测试/karma.conf.js
信息[karma]:Karma v0.12.23服务器从http://localhost:8080/
启动 信息[启动器]:启动浏览器PhantomJS
INFO [PhantomJS 1.9.8(Linux)]:连接到ID为96802943的套接字U34UATs8jZDPB74AXpqR
PhantomJS 1.9.8(Linux):已执行0，共20成功(0秒/0秒)
PhantomJS 1.9.8(Linux)自动对焦指令应将焦点设置为第一个自动对焦元素FAILED
预计将被称为间谍重点.
PhantomJS 1.9.8(Linux):执行20之20(失败1次)(0.156秒/0.146秒)

$ node_modules/karma/bin/karma start test/karma.conf.js
INFO [karma]: Karma v0.12.23 server started at http:// localhost:8080/
INFO [launcher]: Starting browser PhantomJS
INFO [PhantomJS 1.9.8 (Linux)]: Connected on socket U34UATs8jZDPB74AXpqR with id 96802943
PhantomJS 1.9.8 (Linux): Executed 0 of 20 SUCCESS (0 secs / 0 secs)
PhantomJS 1.9.8 (Linux) The autofocus directive should set focus to first autofocus element FAILED
Expected spy focus to have been called.
PhantomJS 1.9.8 (Linux): Executed 20 of 20 (1 FAILED) (0.156 secs / 0.146 secs)

---

只需添加

---

Just adding

input[0].focus();

在spyOn(input[0], 'focus')之后，测试当然成功了，但这不是我想要的...

after spyOn(input[0], 'focus') the test succeeds, of course, but it's not what I want...

最后一个问题是: 我如何业力测试将焦点放在元素上的指令?

The final question is: How do I karma-test a directive which sets focus to an element ?

推荐答案

仅在单元测试中调用angular.element时，Angular将不理解自动对焦"是指令.因此，在您的代码中:

When you call angular.element only in unit test, Angular will not understand the "autofocus" is a directive. Therefore, in your code :

var form = angular.element('<form />');
var input1 = angular.element('<input type="text" name="first" />');
var input2 = angular.element('<input type="text" name="second" autofocus="true" />');
form.append(input1);
form.append(input2);

Angular不会将自动对焦设置为指令，并且不会分配与您已经声明的自动对焦"指令相关的任何内容. 为了在单元测试中做到这一点，您必须使用 $ compile 为它分配一个范围. 您可以更改小提琴以使其通过测试:

Angular will not set autofocus as a directive and will not assign anythings relating to the "autofocus" directive that you have already declared. In order to do this in unit test, you have to use $compile to assign it with a scope. You can change the fiddle to like this to pass the test:

http://jsfiddle.net/ksqhmkqm/1/.

如您所见，我已经创建了一个新范围

scope = $rootScope.$new();

并创建一个新模板

element = angular.element('<form><input type="text" name="first" /><input type="text" name="second" autofocus="true" /></form>');

并将创建的范围分配给此新模板

$compile(element)(scope);
scope.$digest();

通过这种方式，angular将理解自动对焦"是一个指令，并将您创建的所有事件分配给该元素，该元素将在其中进行自动对焦".

With this way, angular will understand the "autofocus" is a directive and assign all the event that you have created to this element that "autofocus" is working on.

我遵循此参考资料进行的焦点事件测试:

The testing for the focus event I have followed this reference:

如何我要检查我的元素是否已集中在单元测试中

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