Unit testing plugin directives with requirements - angularjs

Question

I'm using Videogular in an Angular app I'm working on. I wrote a plugin directive for it that listens to an event broadcast from $rootScope, and, if a video is playing, automatically pauses it when the event is broadcast.
omgYesDirectives.directive('vgAutoPause',
['$rootScope',
function($rootScope) {
return {
restrict: 'E',
require: '^videogular',
link: function($scope, $elem, $attr, $API) {
$rootScope.$on('onGameEnable', onGameEnable);
function onGameEnable(event, data)
{
$API.pause();
}
}
}
}
]);
But I'm having trouble figuring out how to unit test it. I can't seem to properly inject Videogular itself into my test. I've tried variations on this:
describe('vgAutoPause', function () {
var scope, compile, elm, videogular;
beforeEach(inject(function ($compile, $rootScope, videogularDirective) {
videogular = videogularDirective;
scope = $rootScope.$new();
compile = $compile;
}));
it('should instantiate as an HTML element', function () {
elm = compile('<videogular><vg-auto-pause></vg-auto-pause></videogular>')(scope);
scope.$digest();
expect(elm.html()).toContain('vg-auto-pause');
});
});
but Karma keeps complaining about it:
Error: [$injector:unpr] Unknown provider: videogularDirectiveProvider <- videogularDirective
Am I doing it wrong? Do you have any thoughts or suggestions on what I ought to be doing instead?

Answer 1

In AngularJS You can't inject a directive, you must create the HTML and then $compile it to start the $digest cycle.
For example, this is a simple videogular testing:
'use strict';
describe('Directive: Videogular', function () {
var element;
var scope;
beforeEach(module('myApp'));
beforeEach(inject(function ($compile, $rootScope) {
scope = $rootScope;
element = angular.element("<div><videogular><video></video></videogular></div>");
$compile(element)($rootScope);
}));
describe("videogular", function() {
it("should have videogular", function() {
scope.$digest();
expect(element.html()).toContain('<video></video>');
});
});
});
Maybe you need to understand first how to test directives, there's a lot of good info out there. You can start with this links:
http://docs.angularjs.org/guide/unit-testing
https://egghead.io/lessons/angularjs-unit-testing-a-directive
http://angular-tips.com/blog/2013/08/watch-how-the-apply-runs-a-digest/