Copied acceptance tests infrastructures from oC/core

Signed-off-by: Kiran Parajuli <kiranparajuli589@gmail.com>

tests/TestHelpers/TranslationHelper.php

@@ -0,0 +1,46 @@
+<?php declare(strict_types=1);
+/**
+ * ownCloud
+ *
+ * @author Talank Baral <talank@jankaritech.com>
+ * @copyright Copyright (c) 2021 Talank Baral talank@jankaritech.com
+ *
+ * This code 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 any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace TestHelpers;
+
+/**
+ * Class TranslationHelper
+ *
+ * Helper functions that are needed to run tests on different languages
+ *
+ * @package TestHelpers
+ */
+class TranslationHelper {
+	/**
+	 * @param string|null $language
+	 *
+	 * @return string|null
+	 */
+	public static function getLanguage(?string $language): ?string {
+		if (!isset($language)) {
+			if (\getenv('OC_LANGUAGE') !== false) {
+				$language = \getenv('OC_LANGUAGE');
+			}
+		}
+		return $language;
+	}
+}