[TESTS] Add tests to all relevant methods under App\Util and fix errors that popup

tests/Util/HTMLTest.php

@@ -0,0 +1,34 @@
+<?php
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+
+namespace App\Tests\Util;
+
+use App\Util\HTML;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class HTMLTest extends WebTestCase
+{
+    public function testHTML()
+    {
+        static::assertSame('', HTML::html(''));
+        static::assertSame("<a>\n\n</a>\n", HTML::html(['a' => '']));
+        static::assertSame("<a>\n  <p>\n  </p>\n</a>\n", HTML::html(['a' => ['p' => '']]));
+        static::assertSame("<a>\n  <p>\n    foo\n  </p>\n  <br/>\n</a>\n", HTML::html(['a' => ['p' => 'foo', 'br' => 'empty']]));
+    }
+}