diff --git a/src/Core/Authentication.php b/src/Core/Authentication.php
index 4d227c2710..50825c525e 100644
--- a/src/Core/Authentication.php
+++ b/src/Core/Authentication.php
@@ -12,6 +12,7 @@ use Friendica\Core\L10n;
 use Friendica\Core\Logger;
 use Friendica\Core\PConfig;
 use Friendica\Database\DBA;
+use Friendica\Model\User;
 use Friendica\Util\DateTimeFormat;
 
 /**
@@ -103,55 +104,16 @@ class Authentication extends BaseObject
 			$a->timezone = $a->user['timezone'];
 		}
 
-		$master_record = $a->user;
+		$masterUid = $user_record['uid'];
 
 		if ((x($_SESSION, 'submanage')) && intval($_SESSION['submanage'])) {
-			$user = DBA::selectFirst('user', [], ['uid' => $_SESSION['submanage']]);
+			$user = DBA::selectFirst('user', ['uid'], ['uid' => $_SESSION['submanage']]);
 			if (DBA::isResult($user)) {
-				$master_record = $user;
+				$masterUid = $user['uid'];
 			}
 		}
 
-		if ($master_record['parent-uid'] == 0) {
-			// First add our own entry
-			$a->identities = [['uid' => $master_record['uid'],
-					'username' => $master_record['username'],
-					'nickname' => $master_record['nickname']]];
-
-			// Then add all the children
-			$r = DBA::select('user', ['uid', 'username', 'nickname'],
-				['parent-uid' => $master_record['uid'], 'account_removed' => false]);
-			if (DBA::isResult($r)) {
-				$a->identities = array_merge($a->identities, DBA::toArray($r));
-			}
-		} else {
-			// Just ensure that the array is always defined
-			$a->identities = [];
-
-			// First entry is our parent
-			$r = DBA::select('user', ['uid', 'username', 'nickname'],
-				['uid' => $master_record['parent-uid'], 'account_removed' => false]);
-			if (DBA::isResult($r)) {
-				$a->identities = DBA::toArray($r);
-			}
-
-			// Then add all siblings
-			$r = DBA::select('user', ['uid', 'username', 'nickname'],
-				['parent-uid' => $master_record['parent-uid'], 'account_removed' => false]);
-			if (DBA::isResult($r)) {
-				$a->identities = array_merge($a->identities, DBA::toArray($r));
-			}
-		}
-
-		$r = DBA::p("SELECT `user`.`uid`, `user`.`username`, `user`.`nickname`
-			FROM `manage`
-			INNER JOIN `user` ON `manage`.`mid` = `user`.`uid`
-			WHERE `user`.`account_removed` = 0 AND `manage`.`uid` = ?",
-			$master_record['uid']
-		);
-		if (DBA::isResult($r)) {
-			$a->identities = array_merge($a->identities, DBA::toArray($r));
-		}
+		$a->identities = User::identities($masterUid);
 
 		if ($login_initial) {
 			Logger::log('auth_identities: ' . print_r($a->identities, true), Logger::DEBUG);
@@ -174,7 +136,7 @@ class Authentication extends BaseObject
 
 			// Set the login date for all identities of the user
 			DBA::update('user', ['login_date' => DateTimeFormat::utcNow()],
-				['parent-uid' => $master_record['uid'], 'account_removed' => false]);
+				['parent-uid' => $masterUid, 'account_removed' => false]);
 		}
 
 		if ($login_initial) {
diff --git a/src/Model/User.php b/src/Model/User.php
index 43992cc5f3..a5db34bb44 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -813,4 +813,74 @@ class User
 			$a->internalRedirect();
 		}
 	}
+
+	/**
+	 * Return all identities to a user
+	 *
+	 * @param int $uid The user id
+	 * @return array All identities for this user
+	 *
+	 * Example for a return:
+	 * 	[
+	 * 		[
+	 * 			'uid' => 1,
+	 * 			'username' => 'maxmuster',
+	 * 			'nickname' => 'Max Mustermann'
+	 * 		],
+	 * 		[
+	 * 			'uid' => 2,
+	 * 			'username' => 'johndoe',
+	 * 			'nickname' => 'John Doe'
+	 * 		]
+	 * 	]
+	 */
+	public static function identities($uid)
+	{
+		$identities = [];
+
+		$user = DBA::selectFirst('user', ['uid', 'nickname', 'username', 'parent-uid'], ['uid' => $uid]);
+		if (!DBA::isResult($user)) {
+			return $identities;
+		}
+
+		if ($user['parent-uid'] == 0) {
+			// First add our own entry
+			$identities = [['uid' => $user['uid'],
+				'username' => $user['username'],
+				'nickname' => $user['nickname']]];
+
+			// Then add all the children
+			$r = DBA::select('user', ['uid', 'username', 'nickname'],
+				['parent-uid' => $user['uid'], 'account_removed' => false]);
+			if (DBA::isResult($r)) {
+				$identities = array_merge($identities, DBA::toArray($r));
+			}
+		} else {
+			// First entry is our parent
+			$r = DBA::select('user', ['uid', 'username', 'nickname'],
+				['uid' => $user['parent-uid'], 'account_removed' => false]);
+			if (DBA::isResult($r)) {
+				$identities = DBA::toArray($r);
+			}
+
+			// Then add all siblings
+			$r = DBA::select('user', ['uid', 'username', 'nickname'],
+				['parent-uid' => $user['parent-uid'], 'account_removed' => false]);
+			if (DBA::isResult($r)) {
+				$identities = array_merge($identities, DBA::toArray($r));
+			}
+		}
+
+		$r = DBA::p("SELECT `user`.`uid`, `user`.`username`, `user`.`nickname`
+			FROM `manage`
+			INNER JOIN `user` ON `manage`.`mid` = `user`.`uid`
+			WHERE `user`.`account_removed` = 0 AND `manage`.`uid` = ?",
+			$user['uid']
+		);
+		if (DBA::isResult($r)) {
+			$identities = array_merge($identities, DBA::toArray($r));
+		}
+
+		return $identities;
+	}
 }
diff --git a/tests/Util/DBAMockTrait.php b/tests/Util/DBAMockTrait.php
index 1bb69c27bf..2ee54adaa1 100644
--- a/tests/Util/DBAMockTrait.php
+++ b/tests/Util/DBAMockTrait.php
@@ -69,4 +69,117 @@ trait DBAMockTrait
 			->times($times)
 			->andReturn($return);
 	}
+
+
+	/**
+	 * Mocking DBA::select()
+	 *
+	 * @param string $tableName The name of the table
+	 * @param array $select The Select Array (Default is [])
+	 * @param array $where The Where Array (Default is [])
+	 * @param object $return The array to return (Default is [])
+	 * @param null|int $times How often the method will get used
+	 */
+	public function mockSelect($tableName, $select = [], $where = [], $return = null, $times = null)
+	{
+		if (!isset($this->dbaMock)) {
+			$this->dbaMock = \Mockery::mock('alias:Friendica\Database\DBA');
+		}
+
+		$this->dbaMock
+			->shouldReceive('select')
+			->with($tableName, $select, $where)
+			->times($times)
+			->andReturn($return);
+	}
+
+	/**
+	 * Mocking DBA::selectFirst()
+	 *
+	 * @param string $tableName The name of the table
+	 * @param array $select The Select Array (Default is [])
+	 * @param array $where The Where Array (Default is [])
+	 * @param array $return The array to return (Default is [])
+	 * @param null|int $times How often the method will get used
+	 */
+	public function mockSelectFirst($tableName, $select = [], $where = [], $return = [], $times = null)
+	{
+		if (!isset($this->dbaMock)) {
+			$this->dbaMock = \Mockery::mock('alias:Friendica\Database\DBA');
+		}
+
+		$this->dbaMock
+			->shouldReceive('selectFirst')
+			->with($tableName, $select, $where)
+			->times($times)
+			->andReturn($return);
+	}
+
+	/**
+	 * Mocking DBA::isResult()
+	 *
+	 * @param object $record The record to test
+	 * @param bool $return True, if the DB is connected, otherwise false
+	 * @param null|int $times How often the method will get used
+	 */
+	public function mockIsResult($record, $return = true, $times = null)
+	{
+		if (!isset($this->dbaMock)) {
+			$this->dbaMock = \Mockery::mock('alias:Friendica\Database\DBA');
+		}
+
+		$this->dbaMock
+			->shouldReceive('isResult')
+			->with($record)
+			->times($times)
+			->andReturn($return);
+	}
+
+	/**
+	 * Mocking DBA::isResult()
+	 *
+	 * @param object $record The record to test
+	 * @param array $return The array to return
+	 * @param null|int $times How often the method will get used
+	 */
+	public function mockToArray($record = null, $return = [], $times = null)
+	{
+		if (!isset($this->dbaMock)) {
+			$this->dbaMock = \Mockery::mock('alias:Friendica\Database\DBA');
+		}
+
+		$this->dbaMock
+			->shouldReceive('toArray')
+			->with($record)
+			->times($times)
+			->andReturn($return);
+	}
+
+
+	/**
+	 * Mocking DBA::p()
+	 *
+	 * @param string $sql The SQL statement
+	 * @param object $return The object to return
+	 * @param null|int $times How often the method will get used
+	 */
+	public function mockP($sql = null, $return = null, $times = null)
+	{
+		if (!isset($this->dbaMock)) {
+			$this->dbaMock = \Mockery::mock('alias:Friendica\Database\DBA');
+		}
+
+		if (!isset($sql)) {
+			$this->dbaMock
+				->shouldReceive('p')
+				->times($times)
+				->andReturn($return);
+		} else {
+			$this->dbaMock
+				->shouldReceive('p')
+				->with($sql)
+				->times($times)
+				->andReturn($return);
+		}
+	}
 }
diff --git a/tests/src/Model/UserTest.php b/tests/src/Model/UserTest.php
new file mode 100644
index 0000000000..6655575f87
--- /dev/null
+++ b/tests/src/Model/UserTest.php
@@ -0,0 +1,148 @@
+<?php
+
+namespace Friendica\Test\Object;
+
+use Friendica\Model\User;
+use Friendica\Test\MockedTest;
+use Friendica\Test\Util\DBAMockTrait;
+
+class UserTest extends MockedTest
+{
+	use DBAMockTrait;
+
+	private $parent;
+	private $child;
+	private $manage;
+
+	protected function setUp()
+	{
+		parent::setUp();
+
+		$this->parent = [
+			'uid'        => 1,
+			'username'   => 'maxmuster',
+			'nickname'   => 'Max Muster'
+		];
+
+		$this->child = [
+			'uid'        => 2,
+			'username'   => 'johndoe',
+			'nickname'   => 'John Doe'
+		];
+
+		$this->manage = [
+			'uid'        => 3,
+			'username'   => 'janesmith',
+			'nickname'   => 'Jane Smith'
+		];
+	}
+
+	public function testIdentitiesEmpty()
+	{
+		$this->mockSelectFirst('user',
+			['uid', 'nickname', 'username', 'parent-uid'],
+			['uid' => $this->parent['uid']],
+			$this->parent,
+			1
+		);
+		$this->mockIsResult($this->parent, false, 1);
+
+		$record = User::identities($this->parent['uid']);
+
+		$this->assertEquals([], $record);
+	}
+
+	public function testIdentitiesAsParent()
+	{
+		$parentSelect = $this->parent;
+		$parentSelect['parent-uid'] = 0;
+
+		// Select the user itself (=parent)
+		$this->mockSelectFirst('user',
+			['uid', 'nickname', 'username', 'parent-uid'],
+			['uid' => $this->parent['uid']],
+			$parentSelect,
+			1
+		);
+		$this->mockIsResult($parentSelect, true, 1);
+
+		// Select one child
+		$this->mockSelect('user',
+			['uid', 'username', 'nickname'],
+			[
+				'parent-uid' => $this->parent['uid'],
+				'account_removed' => false
+			],
+			'objectReturn',
+			1
+		);
+		$this->mockIsResult('objectReturn', true, 1);
+		$this->mockToArray('objectReturn', [ $this->child ], 1);
+
+		// Select the manage
+		$this->mockP(null, 'objectTwo', 1);
+		$this->mockIsResult('objectTwo', true, 1);
+		$this->mockToArray('objectTwo', [ $this->manage ], 1);
+
+		$record = User::identities($this->parent['uid']);
+
+		$this->assertEquals([
+			$this->parent,
+			$this->child,
+			$this->manage
+		], $record);
+	}
+
+	public function testIdentitiesAsChild()
+	{
+		$childSelect = $this->child;
+		$childSelect['parent-uid'] = $this->parent['uid'];
+
+		// Select the user itself (=child)
+		$this->mockSelectFirst('user',
+			['uid', 'nickname', 'username', 'parent-uid'],
+			['uid' => $this->child['uid']],
+			$childSelect,
+			1
+		);
+		$this->mockIsResult($childSelect, true, 1);
+
+		// Select the parent
+		$this->mockSelect('user',
+			['uid', 'username', 'nickname'],
+			[
+				'uid' => $this->parent['uid'],
+				'account_removed' => false
+			],
+			'objectReturn',
+			1
+		);
+		$this->mockIsResult('objectReturn', true, 1);
+		$this->mockToArray('objectReturn', [ $this->parent ], 1);
+
+		// Select the childs (user & manage)
+		$this->mockSelect('user',
+			['uid', 'username', 'nickname'],
+			[
+				'parent-uid' => $this->parent['uid'],
+				'account_removed' => false
+			],
+			'objectReturn',
+			1
+		);
+		$this->mockIsResult('objectReturn', true, 1);
+		$this->mockToArray('objectReturn', [ $this->child, $this->manage ], 1);
+
+		// Select the manage
+		$this->mockP(null, 'objectTwo', 1);
+		$this->mockIsResult('objectTwo', false, 1);
+
+		$record = User::identities($this->child['uid']);
+
+		$this->assertEquals([
+			$this->parent,
+			$this->child,
+			$this->manage
+		], $record);
+	}
+}