问题
Note: the suggested link is an answer to a question about a service, and doesn't give a clear explanation on how to solve this issue
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) {
$timeout(function () {
element[0].focus();
console.log('focus called');
});
}
}
);
}
};
});
This is my current test:
describe('The autofocus directive', function () {
var timeout;
beforeEach(module('myApp'));
beforeEach(inject(function($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();
});
This is the (FAILED) output from karma
:
$ 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)
Just adding
input[0].focus();
after spyOn(input[0], 'focus')
the test succeeds, of course, but it's not what I want...
The final question is: How do I karma-test a directive which sets focus to an element ?
回答1:
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 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/.
As you can see, I have created a new scope
scope = $rootScope.$new();
And create a new template
element = angular.element('<form><input type="text" name="first" /><input type="text" name="second" autofocus="true" /></form>');
And assign the created scope to this new template
$compile(element)(scope);
scope.$digest();
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.
The testing for the focus event I have followed this reference:
How do I check if my element has been focussed in a unit test
来源:https://stackoverflow.com/questions/26633684/angularjs-how-to-test-directive-which-gives-focus-to-element