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How to write test cases for angular js directive with template url and link function

I need to write a unit test case for angular js directive with template url and link function below. i have tried but not working out. Can anyone please give me an idea to write a unit testcase to complete it. I am using Angular JS and Jasmine for testing.

HTML file

<!-- adPage.html --> <!DOCTYPE html> <html> <head> <link rel='stylesheet' href='style.css'/> <script src='script.js'></script> </head> <body> <h1><!-- @Title --></h1>

<p>Promoted post by <!-- @Author --> on <!-- @Datetime --></p>

<article> <!-- @Content --> </article> </body> </html>

<!-- Directive Used Page --> <div id="content" adDirective> </div>

Script file.js

// Script for Directive

(function () { 'use strict';

angular.module('adModule', [
]).directive('addirective', ['$timeout', '$document', function ($timeout, $document) {
    return {
        restrict: 'A',
        link: link,
        templateUrl: 'adpage.html'

    function link (scope, element, attrs) {
        var document = $document[0];
        var head = document.head;

        var meta, script;

        var timeoutId = $timeout(function () {
            meta = document.createElement('meta');
            meta.setAttribute('name', 'robots');
            meta.setAttribute('content', 'noindex, nofollow');

            script = document.createElement('script');
            script.setAttribute('type', 'text/javascript');
            script.setAttribute('async', 'async');
            script.setAttribute('defer', 'defer');
            script.setAttribute('crossorigin', 'anonymous');
            script.setAttribute('src', '//adyoulike.omnitagjs.com');

        }, 200);

        element.on('$destroy', function () {