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diff --git a/tests/lib/Util/User/Dummy.php b/tests/lib/Util/User/Dummy.php
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+++ b/tests/lib/Util/User/Dummy.php
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+<?php
+/**
+ * @author Andreas Fischer <bantu@owncloud.com>
+ * @author Arthur Schiwon <blizzz@owncloud.com>
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <icewind@owncloud.com>
+ * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace Test\Util\User;
+
+use \OC\User\Backend;
+
+/**
+ * dummy user backend, does not keep state, only for testing use
+ */
+class Dummy extends Backend implements \OCP\IUserBackend {
+	private $users = array();
+	private $displayNames = array();
+
+	/**
+	 * Create a new user
+	 *
+	 * @param string $uid The username of the user to create
+	 * @param string $password The password of the new user
+	 * @return bool
+	 *
+	 * Creates a new user. Basic checking of username is done in OC_User
+	 * itself, not in its subclasses.
+	 */
+	public function createUser($uid, $password) {
+		if (isset($this->users[$uid])) {
+			return false;
+		} else {
+			$this->users[$uid] = $password;
+			return true;
+		}
+	}
+
+	/**
+	 * delete a user
+	 *
+	 * @param string $uid The username of the user to delete
+	 * @return bool
+	 *
+	 * Deletes a user
+	 */
+	public function deleteUser($uid) {
+		if (isset($this->users[$uid])) {
+			unset($this->users[$uid]);
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Set password
+	 *
+	 * @param string $uid The username
+	 * @param string $password The new password
+	 * @return bool
+	 *
+	 * Change the password of a user
+	 */
+	public function setPassword($uid, $password) {
+		if (isset($this->users[$uid])) {
+			$this->users[$uid] = $password;
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Check if the password is correct
+	 *
+	 * @param string $uid The username
+	 * @param string $password The password
+	 * @return string
+	 *
+	 * Check if the password is correct without logging in the user
+	 * returns the user id or false
+	 */
+	public function checkPassword($uid, $password) {
+		if (isset($this->users[$uid]) && $this->users[$uid] === $password) {
+			return $uid;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Get a list of all users
+	 *
+	 * @param string $search
+	 * @param null|int $limit
+	 * @param null|int $offset
+	 * @return string[] an array of all uids
+	 */
+	public function getUsers($search = '', $limit = null, $offset = null) {
+		if (empty($search)) {
+			return array_keys($this->users);
+		}
+		$result = array();
+		foreach (array_keys($this->users) as $user) {
+			if (stripos($user, $search) !== false) {
+				$result[] = $user;
+			}
+		}
+		return $result;
+	}
+
+	/**
+	 * check if a user exists
+	 *
+	 * @param string $uid the username
+	 * @return boolean
+	 */
+	public function userExists($uid) {
+		return isset($this->users[$uid]);
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasUserListings() {
+		return true;
+	}
+
+	/**
+	 * counts the users in the database
+	 *
+	 * @return int|bool
+	 */
+	public function countUsers() {
+		return 0;
+	}
+
+	public function setDisplayName($uid, $displayName) {
+		$this->displayNames[$uid] = $displayName;
+	}
+
+	public function getDisplayName($uid) {
+		return isset($this->displayNames[$uid])? $this->displayNames[$uid]: $uid;
+	}
+
+	/**
+	 * Backend name to be shown in user management
+	 * @return string the name of the backend to be shown
+	 */
+	public function getBackendName(){
+		return 'Dummy';
+	}
+}