[MM-39839] Changes for writing unit tests, some re-org (#1849)

* Move tests to individual folders

* Moved e2e tests to e2e folder, fixed lint issues

* Lint fix

src/common/utils/url.test.js

@@ -0,0 +1,18 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+'use strict';
+
+import assert from 'assert';
+
+import urlUtils from 'common/utils/url';
+
+describe('URL', () => {
+    describe('parseURL', () => {
+        it('should remove duplicate slashes in a URL when parsing', () => {
+            const urlWithExtraSlashes = 'https://mattermost.com//sub//path//example';
+            const parsedURL = urlUtils.parseURL(urlWithExtraSlashes);
+
+            assert.strictEqual(parsedURL.toString(), 'https://mattermost.com/sub/path/example');
+        });
+    });
+});