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diff --git a/javascript/videojs/test/unit/utils/url.test.js b/javascript/videojs/test/unit/utils/url.test.js
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+++ b/javascript/videojs/test/unit/utils/url.test.js
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+/* eslint-env qunit */
+import document from 'global/document';
+import window from 'global/window';
+import * as Url from '../../../src/js/utils/url.js';
+
+QUnit.module('utils/url');
+
+QUnit.test('should parse the details of a url correctly', function(assert) {
+  assert.equal(Url.parseUrl('#').protocol, window.location.protocol, 'parsed relative url protocol');
+  assert.equal(Url.parseUrl('#').host, window.location.host, 'parsed relative url host');
+  assert.equal(Url.parseUrl('#foo').hash, '#foo', 'parsed relative url hash');
+
+  assert.equal(Url.parseUrl('http://example.com').protocol, 'http:', 'parsed example url protocol');
+  assert.equal(Url.parseUrl('http://example.com').hostname, 'example.com', 'parsed example url hostname');
+
+  assert.equal(Url.parseUrl('http://example.com:1234').port, '1234', 'parsed example url port');
+});
+
+QUnit.test('should strip port from hosts using http or https', function(assert) {
+  const origDocCreate = document.createElement;
+
+  // attempts to create elements will return an anchor tag that
+  // misbehaves like IE9
+  document.createElement = function() {
+    return {
+      hostname: 'example.com',
+      host: 'example.com:80',
+      protocol: 'http:',
+      port: '80',
+      pathname: '/domain/relative/url',
+      hash: ''
+    };
+  };
+
+  const url = Url.parseUrl('/domain/relative/url');
+
+  document.createElement = origDocCreate;
+
+  assert.ok(!(/.*:80$/).test(url.host), ':80 is not appended to the host');
+
+});
+
+QUnit.test('should get an absolute URL', function(assert) {
+  assert.ok(Url.getAbsoluteURL(window.location.pathname + window.location.search) === window.location.href);
+  assert.ok(Url.getAbsoluteURL('http://asdf.com') === 'http://asdf.com/');
+  assert.ok(Url.getAbsoluteURL('https://asdf.com/index.html') === 'https://asdf.com/index.html');
+});
+
+// getFileExtension tests
+QUnit.test('should get the file extension of the passed path', function(assert) {
+  assert.equal(Url.getFileExtension('/foo/bar/test.video.wgg'), 'wgg');
+  assert.equal(Url.getFileExtension('test./video.mp4'), 'mp4');
+  assert.equal(Url.getFileExtension('.bar/test.video.m4v'), 'm4v');
+  assert.equal(Url.getFileExtension('foo/.bar/test.video.flv'), 'flv');
+  assert.equal(Url.getFileExtension('foo/.bar/test.video.flv?foo=bar'), 'flv');
+  assert.equal(Url.getFileExtension('http://www.test.com/video.mp4'), 'mp4');
+  assert.equal(Url.getFileExtension('http://foo/bar/test.video.wgg'), 'wgg');
+  assert.equal(Url.getFileExtension('http://www.test.com/video/.mp4'), 'mp4');
+  assert.equal(Url.getFileExtension('http://www.test.com/video/.mp4/'), 'mp4');
+  assert.equal(Url.getFileExtension('http://www.test.com/video.mp4/'), 'mp4');
+
+  // edge cases
+  assert.equal(Url.getFileExtension('http://...'), '');
+  assert.equal(Url.getFileExtension('foo/.bar/testvideo'), '');
+  assert.equal(Url.getFileExtension(''), '');
+  assert.equal(Url.getFileExtension(null), '');
+  assert.equal(Url.getFileExtension(undefined), '');
+
+  // with capital letters
+  assert.equal(Url.getFileExtension('test.video.MP4'), 'mp4');
+  assert.equal(Url.getFileExtension('test.video.FLV'), 'flv');
+});
+
+// isCrossOrigin tests
+QUnit.test('isCrossOrigin can identify cross origin urls', function(assert) {
+
+  assert.ok(!Url.isCrossOrigin(`http://${window.location.host}/example.vtt`), 'http://google.com from http://google.com is not cross origin');
+  assert.ok(Url.isCrossOrigin(`https://${window.location.host}/example.vtt`), 'https://google.com from http://google.com is cross origin');
+  assert.ok(!Url.isCrossOrigin(`//${window.location.host}/example.vtt`), '//google.com from http://google.com is not cross origin');
+  assert.ok(Url.isCrossOrigin('http://example.com/example.vtt'), 'http://example.com from http://google.com is cross origin');
+  assert.ok(Url.isCrossOrigin('https://example.com/example.vtt'), 'https://example.com from http://google.com is cross origin');
+  assert.ok(Url.isCrossOrigin('//example.com/example.vtt'), '//example.com from http://google.com is cross origin');
+  // we cannot test that relative urls work on https, though
+  assert.ok(!Url.isCrossOrigin('example.vtt'), 'relative url is not cross origin');
+
+  const location = new URL('https:/google.com');
+
+  assert.ok(!Url.isCrossOrigin('https://google.com/example.vtt', location), 'https://google.com from https://google.com is not cross origin');
+  assert.ok(Url.isCrossOrigin('http://google.com/example.vtt', location), 'http://google.com from https://google.com is cross origin');
+  assert.ok(Url.isCrossOrigin('http://example.com/example.vtt', location), 'http://example.com from https://google.com is cross origin');
+  assert.ok(Url.isCrossOrigin('https://example.com/example.vtt', location), 'https://example.com from https://google.com is cross origin');
+  assert.ok(Url.isCrossOrigin('//example.com/example.vtt', location), '//example.com from https://google.com is cross origin');
+});