diff --git a/apps/user_ldap/appinfo/info.xml b/apps/user_ldap/appinfo/info.xml
index 7535790fa57a7d4551e391b0c57d80c7d7f4b39f..9794db30e2bd8efaeedd407375e4dd2afa6b4e70 100644
--- a/apps/user_ldap/appinfo/info.xml
+++ b/apps/user_ldap/appinfo/info.xml
@@ -9,7 +9,7 @@ A user logs into ownCloud with their LDAP or AD credentials, and is granted acce
 	</description>
 	<licence>AGPL</licence>
 	<author>Dominik Schmidt and Arthur Schiwon</author>
-	<version>1.2.0</version>
+	<version>1.2.1</version>
 	<types>
 		<authentication/>
 	</types>
@@ -32,4 +32,10 @@ A user logs into ownCloud with their LDAP or AD credentials, and is granted acce
 		<admin>OCA\User_LDAP\Settings\Admin</admin>
 		<admin-section>OCA\User_LDAP\Settings\Section</admin-section>
 	</settings>
+
+	<repair-steps>
+		<post-migration>
+			<step>OCA\User_LDAP\Migration\UUIDFixInsert</step>
+		</post-migration>
+	</repair-steps>
 </info>
diff --git a/apps/user_ldap/lib/Group_LDAP.php b/apps/user_ldap/lib/Group_LDAP.php
index 49e5e724833448937061c05660c72d90a64949e1..d620a00f849476ee09e766b0fe1229fb8bd9c332 100644
--- a/apps/user_ldap/lib/Group_LDAP.php
+++ b/apps/user_ldap/lib/Group_LDAP.php
@@ -902,4 +902,12 @@ class Group_LDAP extends BackendUtility implements \OCP\GroupInterface {
 	public function implementsActions($actions) {
 		return (bool)(\OC\Group\Backend::COUNT_USERS & $actions);
 	}
+
+	/**
+	 * Return access for LDAP interaction.
+	 * @return Access instance of Access for LDAP interaction
+	 */
+	public function getLDAPAccess() {
+		return $this->access;
+	}
 }
diff --git a/apps/user_ldap/lib/Group_Proxy.php b/apps/user_ldap/lib/Group_Proxy.php
index 64b85427f8f9cfd53bb2c445fa0a7b8bd8d91423..c102e7ac6268a18ac4e91ebae18223d3677c251d 100644
--- a/apps/user_ldap/lib/Group_Proxy.php
+++ b/apps/user_ldap/lib/Group_Proxy.php
@@ -196,4 +196,13 @@ class Group_Proxy extends Proxy implements \OCP\GroupInterface {
 		//it's the same across all our user backends obviously
 		return $this->refBackend->implementsActions($actions);
 	}
+
+	/**
+	 * Return access for LDAP interaction.
+	 * @param string $gid
+	 * @return Access instance of Access for LDAP interaction
+	 */
+	public function getLDAPAccess($gid) {
+		return $this->handleRequest($gid, 'getLDAPAccess', []);
+	}
 }
diff --git a/apps/user_ldap/lib/Mapping/AbstractMapping.php b/apps/user_ldap/lib/Mapping/AbstractMapping.php
index 6fb4a5436c3ec201f99eaa6efaeb24c315ba1c5e..755cfadbccdbf88d25c510fa5198074dd86c8e38 100644
--- a/apps/user_ldap/lib/Mapping/AbstractMapping.php
+++ b/apps/user_ldap/lib/Mapping/AbstractMapping.php
@@ -128,6 +128,25 @@ abstract class AbstractMapping {
 		return $this->modify($query, array($fdn, $uuid));
 	}
 
+	/**
+	 * Updates the UUID based on the given DN
+	 *
+	 * required by Migration/UUIDFix
+	 *
+	 * @param $uuid
+	 * @param $fdn
+	 * @return bool
+	 */
+	public function setUUIDbyDN($uuid, $fdn) {
+		$query = $this->dbc->prepare('
+			UPDATE `' . $this->getTableName() . '`
+			SET `directory_uuid` = ?
+			WHERE `ldap_dn` = ?
+		');
+
+		return $this->modify($query, [$uuid, $fdn]);
+	}
+
 	/**
 	 * Gets the name based on the provided LDAP DN.
 	 * @param string $fdn
diff --git a/apps/user_ldap/lib/Migration/UUIDFix.php b/apps/user_ldap/lib/Migration/UUIDFix.php
new file mode 100644
index 0000000000000000000000000000000000000000..5b9e5e2231d3d662c54b3e1c99ba6b5557b6dad0
--- /dev/null
+++ b/apps/user_ldap/lib/Migration/UUIDFix.php
@@ -0,0 +1,60 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Migration;
+
+
+use OC\BackgroundJob\QueuedJob;
+use OCA\User_LDAP\Mapping\AbstractMapping;
+use OCA\User_LDAP\Proxy;
+use OCA\User_LDAP\User_Proxy;
+
+abstract class UUIDFix extends QueuedJob {
+	/** @var  AbstractMapping */
+	protected $mapper;
+
+	/** @var  Proxy */
+	protected $proxy;
+
+	public function run($argument) {
+		$isUser = $this->proxy instanceof User_Proxy;
+		foreach($argument['records'] as $record) {
+			$access = $this->proxy->getLDAPAccess($record['name']);
+			$uuid = $access->getUUID($record['dn'], $isUser);
+			if($uuid === false) {
+				// record not found, no prob, continue with the next
+				continue;
+			}
+			if($uuid !== $record['uuid']) {
+				$this->mapper->setUUIDbyDN($uuid, $record['dn']);
+			}
+		}
+	}
+
+	/**
+	 * @param Proxy $proxy
+	 */
+	public function overrideProxy(Proxy $proxy) {
+		$this->proxy = $proxy;
+	}
+}
diff --git a/apps/user_ldap/lib/Migration/UUIDFixGroup.php b/apps/user_ldap/lib/Migration/UUIDFixGroup.php
new file mode 100644
index 0000000000000000000000000000000000000000..ae84e668871b098753146ace2ed7345ddf29afc1
--- /dev/null
+++ b/apps/user_ldap/lib/Migration/UUIDFixGroup.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Migration;
+
+use OCA\User_LDAP\Helper;
+use OCA\User_LDAP\ILDAPWrapper;
+use OCA\User_LDAP\Mapping\GroupMapping;
+use OCA\User_LDAP\User_Proxy;
+use OCP\IConfig;
+
+class UUIDFixGroup extends UUIDFix {
+	public function __construct(GroupMapping $mapper, ILDAPWrapper $ldap, IConfig $config, Helper $helper) {
+		$this->mapper = $mapper;
+		$this->proxy = new User_Proxy($helper->getServerConfigurationPrefixes(true), $ldap, $config);
+	}
+}
diff --git a/apps/user_ldap/lib/Migration/UUIDFixInsert.php b/apps/user_ldap/lib/Migration/UUIDFixInsert.php
new file mode 100644
index 0000000000000000000000000000000000000000..a7678b4e71bf7910892c4685b34ce48cb531594d
--- /dev/null
+++ b/apps/user_ldap/lib/Migration/UUIDFixInsert.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Migration;
+
+use OCA\User_LDAP\Mapping\GroupMapping;
+use OCA\User_LDAP\Mapping\UserMapping;
+use OCP\BackgroundJob\IJobList;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class UUIDFixInsert implements IRepairStep {
+
+	/** @var IConfig */
+	protected $config;
+
+	/** @var UserMapping */
+	protected $userMapper;
+
+	/** @var GroupMapping */
+	protected $groupMapper;
+
+	/** @var IJobList */
+	protected $jobList;
+
+	public function __construct(IConfig $config, UserMapping $userMapper, GroupMapping $groupMapper, IJobList $jobList) {
+		$this->config = $config;
+		$this->userMapper = $userMapper;
+		$this->groupMapper = $groupMapper;
+		$this->jobList = $jobList;
+	}
+
+	/**
+	 * Returns the step's name
+	 *
+	 * @return string
+	 * @since 9.1.0
+	 */
+	public function getName() {
+		return 'Insert UUIDFix background job for user and group batches of 500';
+	}
+
+	/**
+	 * Run repair step.
+	 * Must throw exception on error.
+	 *
+	 * @param IOutput $output
+	 * @throws \Exception in case of failure
+	 * @since 9.1.0
+	 */
+	public function run(IOutput $output) {
+		$installedVersion = $this->config->getAppValue('user_ldap', 'installed_version', '1.2.1');
+		if(version_compare($installedVersion, '1.2.1') !== -1) {
+			return;
+		}
+
+		$batchSize = 500;
+		foreach ([$this->userMapper, $this->groupMapper] as $mapper) {
+			$offset = 0;
+			$jobClass = $mapper instanceof UserMapping ? UUIDFixUser::class : UUIDFixGroup::class;
+			do {
+				$records = $mapper->getList($offset, $batchSize);
+				$this->jobList->add($jobClass, ['records' => $records]);
+				$offset += $batchSize;
+			} while (count($records) === $batchSize);
+		}
+
+	}
+}
diff --git a/apps/user_ldap/lib/Migration/UUIDFixUser.php b/apps/user_ldap/lib/Migration/UUIDFixUser.php
new file mode 100644
index 0000000000000000000000000000000000000000..1e1c1ae23d0c7114de4e20336b291fea3273ef8d
--- /dev/null
+++ b/apps/user_ldap/lib/Migration/UUIDFixUser.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Migration;
+
+use OCA\User_LDAP\Helper;
+use OCA\User_LDAP\ILDAPWrapper;
+use OCA\User_LDAP\Mapping\UserMapping;
+use OCA\User_LDAP\Group_Proxy;
+use OCP\IConfig;
+
+class UUIDFixUser extends UUIDFix {
+	public function __construct(UserMapping $mapper, ILDAPWrapper $ldap, IConfig $config, Helper $helper) {
+		$this->mapper = $mapper;
+		$this->proxy = new Group_Proxy($helper->getServerConfigurationPrefixes(true), $ldap, $config);
+	}
+}
diff --git a/apps/user_ldap/lib/Proxy.php b/apps/user_ldap/lib/Proxy.php
index 6b896e0b13d05b91ccf1ae9f921ba36bbffe08c6..7f998314e20e452ccdee110c0aaaae4e6dd6256a 100644
--- a/apps/user_ldap/lib/Proxy.php
+++ b/apps/user_ldap/lib/Proxy.php
@@ -127,6 +127,12 @@ abstract class Proxy {
 	 */
 	abstract protected function walkBackends($id, $method, $parameters);
 
+	/**
+	 * @param string $id
+	 * @return Access
+	 */
+	abstract public function getLDAPAccess($id);
+
 	/**
 	 * Takes care of the request to the User backend
 	 * @param string $id
diff --git a/apps/user_ldap/tests/Mapping/AbstractMappingTest.php b/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
index 5c3474d9ad22f8aff7136f295c7fc08e7c494cff..c9845bb31e502e74decbd715e3f56e59e94c0773 100644
--- a/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
+++ b/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
@@ -26,6 +26,7 @@
 
 namespace OCA\User_LDAP\Tests\Mapping;
 
+use OCA\User_LDAP\Mapping\AbstractMapping;
 use OCP\IDBConnection;
 
 abstract class AbstractMappingTest extends \Test\TestCase {
@@ -182,7 +183,7 @@ abstract class AbstractMappingTest extends \Test\TestCase {
 	/**
 	 * tests setDNbyUUID() for successful and unsuccessful update.
 	 */
-	public function testSetMethod() {
+	public function testSetDNMethod() {
 		list($mapper, $data) = $this->initTest();
 
 		$newDN = 'uid=modified,dc=example,dc=org';
@@ -196,7 +197,26 @@ abstract class AbstractMappingTest extends \Test\TestCase {
 		$this->assertFalse($done);
 		$name = $mapper->getNameByDN($newDN);
 		$this->assertFalse($name);
+	}
+
+	/**
+	 * tests setUUIDbyDN() for successful and unsuccessful update.
+	 */
+	public function testSetUUIDMethod() {
+		/** @var AbstractMapping $mapper */
+		list($mapper, $data) = $this->initTest();
 
+		$newUUID = 'ABC737-DEF754';
+
+		$done = $mapper->setUUIDbyDN($newUUID, 'uid=notme,dc=example,dc=org');
+		$this->assertFalse($done);
+		$name = $mapper->getNameByUUID($newUUID);
+		$this->assertFalse($name);
+
+		$done = $mapper->setUUIDbyDN($newUUID, $data[0]['dn']);
+		$this->assertTrue($done);
+		$uuid = $mapper->getUUIDByDN($data[0]['dn']);
+		$this->assertSame($uuid, $newUUID);
 	}
 
 	/**
diff --git a/apps/user_ldap/tests/Migration/AbstractUUIDFixTest.php b/apps/user_ldap/tests/Migration/AbstractUUIDFixTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..2b0cb4f20fc6de559d40e2f49d3a131cc867c431
--- /dev/null
+++ b/apps/user_ldap/tests/Migration/AbstractUUIDFixTest.php
@@ -0,0 +1,197 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Tests\Migration;
+
+use Test\TestCase;
+use OCA\User_LDAP\Access;
+use OCA\User_LDAP\Helper;
+use OCA\User_LDAP\ILDAPWrapper;
+use OCA\User_LDAP\Migration\UUIDFixUser;
+use OCA\User_LDAP\Mapping\UserMapping;
+use OCA\User_LDAP\Mapping\GroupMapping;
+use OCA\User_LDAP\User_Proxy;
+use OCP\IConfig;
+
+abstract class AbstractUUIDFixTest extends TestCase {
+	/** @var  Helper|\PHPUnit_Framework_MockObject_MockObject */
+	protected $helper;
+
+	/** @var  IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	protected $config;
+
+	/** @var  ILDAPWrapper|\PHPUnit_Framework_MockObject_MockObject */
+	protected $ldap;
+
+	/** @var  UserMapping|GroupMapping|\PHPUnit_Framework_MockObject_MockObject */
+	protected $mapper;
+
+	/** @var  UUIDFixUser */
+	protected $job;
+
+	/** @var  User_Proxy|\PHPUnit_Framework_MockObject_MockObject */
+	protected $proxy;
+
+	/** @var  Access|\PHPUnit_Framework_MockObject_MockObject */
+	protected $access;
+
+	/** @var bool */
+	protected $isUser = true;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->ldap = $this->createMock(ILDAPWrapper::class);
+		$this->config = $this->createMock(IConfig::class);
+		$this->access = $this->createMock(Access::class);
+
+		$this->helper = $this->createMock(Helper::class);
+		$this->helper->expects($this->any())
+			->method('getServerConfigurationPrefixes')
+			->with(true)
+			->willReturn(['s01', 's03']);
+	}
+
+	protected function mockProxy($className) {
+		$this->proxy = $this->createMock($className);
+		$this->proxy->expects($this->any())
+			->method('getLDAPAccess')
+			->willReturn($this->access);
+	}
+
+	protected function instantiateJob($className) {
+		$this->job = new $className($this->mapper, $this->ldap, $this->config, $this->helper);
+		$this->job->overrideProxy($this->proxy);
+	}
+
+	public function testRunSingleRecord() {
+		$args = [
+			'records' => [
+				0 => [
+					'name' => 'Someone',
+					'dn' => 'uid=Someone,dc=Somewhere',
+					'uuid' => 'kaput'
+				]
+			]
+		];
+		$correctUUID = '4355-AED3-9D73-03AD';
+
+		$this->access->expects($this->once())
+			->method('getUUID')
+			->with($args['records'][0]['dn'], $this->isUser)
+			->willReturn($correctUUID);
+
+		$this->mapper->expects($this->once())
+			->method('setUUIDbyDN')
+			->with($correctUUID, $args['records'][0]['dn']);
+
+		$this->job->run($args);
+	}
+
+	public function testRunValidRecord() {
+		$correctUUID = '4355-AED3-9D73-03AD';
+		$args = [
+			'records' => [
+				0 => [
+					'name' => 'Someone',
+					'dn' => 'uid=Someone,dc=Somewhere',
+					'uuid' => $correctUUID
+				]
+			]
+		];
+
+		$this->access->expects($this->once())
+			->method('getUUID')
+			->with($args['records'][0]['dn'], $this->isUser)
+			->willReturn($correctUUID);
+
+		$this->mapper->expects($this->never())
+			->method('setUUIDbyDN');
+
+		$this->job->run($args);
+	}
+
+	public function testRunRemovedRecord() {
+		$args = [
+			'records' => [
+				0 => [
+					'name' => 'Someone',
+					'dn' => 'uid=Someone,dc=Somewhere',
+					'uuid' => 'kaput'
+				]
+			]
+		];
+
+		$this->access->expects($this->once())
+			->method('getUUID')
+			->with($args['records'][0]['dn'], $this->isUser)
+			->willReturn(false);
+
+		$this->mapper->expects($this->never())
+			->method('setUUIDbyDN');
+
+		$this->job->run($args);
+	}
+
+	public function testRunManyRecords() {
+		$args = [
+			'records' => [
+				0 => [
+					'name' => 'Someone',
+					'dn' => 'uid=Someone,dc=Somewhere',
+					'uuid' => 'kaput'
+				],
+				1 => [
+					'name' => 'kdslkdsaIdsal',
+					'dn' => 'uid=kdslkdsaIdsal,dc=Somewhere',
+					'uuid' => 'AED3-4355-03AD-9D73'
+				],
+				2 => [
+					'name' => 'Paperboy',
+					'dn' => 'uid=Paperboy,dc=Somewhere',
+					'uuid' => 'kaput'
+				]
+			]
+		];
+		$correctUUIDs = ['4355-AED3-9D73-03AD', 'AED3-4355-03AD-9D73', 'AED3-9D73-4355-03AD'];
+
+		$this->access->expects($this->exactly(3))
+			->method('getUUID')
+			->withConsecutive(
+				[$args['records'][0]['dn'], $this->isUser],
+				[$args['records'][1]['dn'], $this->isUser],
+				[$args['records'][2]['dn'], $this->isUser]
+			)
+			->willReturnOnConsecutiveCalls($correctUUIDs[0], $correctUUIDs[1], $correctUUIDs[2]);
+
+		$this->mapper->expects($this->exactly(2))
+			->method('setUUIDbyDN')
+			->withConsecutive(
+				[$correctUUIDs[0], $args['records'][0]['dn']],
+				[$correctUUIDs[2], $args['records'][2]['dn']]
+			);
+
+		$this->job->run($args);
+	}
+
+}
diff --git a/apps/user_ldap/tests/Migration/UUIDFixGroupTest.php b/apps/user_ldap/tests/Migration/UUIDFixGroupTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..6a1651900969a1ce969f44382469cb96bd5de408
--- /dev/null
+++ b/apps/user_ldap/tests/Migration/UUIDFixGroupTest.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\Group_LDAP\Tests\Migration;
+
+use OCA\User_LDAP\Migration\UUIDFixGroup;
+use OCA\User_LDAP\Mapping\GroupMapping;
+use OCA\User_LDAP\Group_Proxy;
+use OCA\User_LDAP\Tests\Migration\AbstractUUIDFixTest;
+
+class UUIDFixGroupTest extends AbstractUUIDFixTest {
+	public function setUp() {
+		$this->isUser = false;
+		parent::setUp();
+
+		$this->isUser = false;
+
+		$this->mapper = $this->createMock(GroupMapping::class);
+
+		$this->mockProxy(Group_Proxy::class);
+		$this->instantiateJob(UUIDFixGroup::class);
+	}
+
+}
diff --git a/apps/user_ldap/tests/Migration/UUIDFixInsertTest.php b/apps/user_ldap/tests/Migration/UUIDFixInsertTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..287edd7fdc473434441d392b428bccc88010a8fc
--- /dev/null
+++ b/apps/user_ldap/tests/Migration/UUIDFixInsertTest.php
@@ -0,0 +1,135 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Tests\Migration;
+
+use OCA\User_LDAP\Migration\UUIDFixInsert;
+use OCA\User_LDAP\Mapping\UserMapping;
+use OCA\User_LDAP\Mapping\GroupMapping;
+use OCP\BackgroundJob\IJobList;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use Test\TestCase;
+
+class UUIDFixInsertTest extends TestCase {
+	/** @var  IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	protected $config;
+
+	/** @var  UserMapping|\PHPUnit_Framework_MockObject_MockObject */
+	protected $userMapper;
+
+	/** @var  GroupMapping|\PHPUnit_Framework_MockObject_MockObject */
+	protected $groupMapper;
+
+	/** @var  IJobList|\PHPUnit_Framework_MockObject_MockObject */
+	protected $jobList;
+
+	/** @var  UUIDFixInsert */
+	protected $job;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->jobList = $this->createMock(IJobList::class);
+		$this->config = $this->createMock(IConfig::class);
+		$this->userMapper = $this->createMock(UserMapping::class);
+		$this->groupMapper = $this->createMock(GroupMapping::class);
+		$this->job = new UUIDFixInsert(
+			$this->config,
+			$this->userMapper,
+			$this->groupMapper,
+			$this->jobList
+		);
+	}
+
+	public function testGetName() {
+		$this->assertSame('Insert UUIDFix background job for user and group batches of 500', $this->job->getName());
+	}
+
+	public function recordProvider() {
+		$record = [
+			'dn' => 'cn=somerecord,dc=somewhere',
+			'name' => 'Something',
+			'uuid' => 'AB12-3456-CDEF7-8GH9'
+		];
+		array_fill(0, 500, $record);
+
+		$userBatches = [
+			0 => array_fill(0, 500, $record),
+			1 => array_fill(0, 500, $record),
+			2 => array_fill(0,  13, $record),
+		];
+
+		$groupBatches = [
+			0 => array_fill(0, 7, $record),
+		];
+
+		return [
+			['userBatches' => $userBatches, 'groupBatches' => $groupBatches]
+		];
+	}
+
+	/**
+	 * @dataProvider recordProvider
+	 */
+	public function testRun($userBatches, $groupBatches) {
+		$this->config->expects($this->once())
+			->method('getAppValue')
+			->with('user_ldap', 'installed_version', '1.2.1')
+			->willReturn('1.2.0');
+
+		$this->userMapper->expects($this->exactly(3))
+			->method('getList')
+			->withConsecutive([0, 500], [500, 500], [1000, 500])
+			->willReturnOnConsecutiveCalls($userBatches[0], $userBatches[1], $userBatches[2]);
+
+		$this->groupMapper->expects($this->exactly(1))
+			->method('getList')
+			->with(0, 500)
+			->willReturn($groupBatches[0]);
+
+		$this->jobList->expects($this->exactly(4))
+			->method('add');
+
+		/** @var IOutput $out */
+		$out = $this->createMock(IOutput::class);
+		$this->job->run($out);
+	}
+
+	public function testDonNotRun() {
+		$this->config->expects($this->once())
+			->method('getAppValue')
+			->with('user_ldap', 'installed_version', '1.2.1')
+			->willReturn('1.2.1');
+		$this->userMapper->expects($this->never())
+			->method('getList');
+		$this->groupMapper->expects($this->never())
+			->method('getList');
+		$this->jobList->expects($this->never())
+			->method('add');
+
+		/** @var IOutput $out */
+		$out = $this->createMock(IOutput::class);
+		$this->job->run($out);
+	}
+}
diff --git a/apps/user_ldap/tests/Migration/UUIDFixUserTest.php b/apps/user_ldap/tests/Migration/UUIDFixUserTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..9ab8f973b91e252604b9c2bf949a76754a416dc9
--- /dev/null
+++ b/apps/user_ldap/tests/Migration/UUIDFixUserTest.php
@@ -0,0 +1,40 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program 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.
+ *
+ * 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 OCA\User_LDAP\Tests\Migration;
+
+use OCA\User_LDAP\Migration\UUIDFixUser;
+use OCA\User_LDAP\Mapping\UserMapping;
+use OCA\User_LDAP\User_Proxy;
+
+class UUIDFixUserTest extends AbstractUUIDFixTest {
+	public function setUp() {
+		$this->isUser = true;
+		parent::setUp();
+
+		$this->mapper = $this->createMock(UserMapping::class);
+
+		$this->mockProxy(User_Proxy::class);
+		$this->instantiateJob(UUIDFixUser::class);
+	}
+}