diff --git a/apps/encryption/tests/Command/TestEnableMasterKey.php b/apps/encryption/tests/Command/TestEnableMasterKey.php
index dac26c5d3c..58118db8c5 100644
--- a/apps/encryption/tests/Command/TestEnableMasterKey.php
+++ b/apps/encryption/tests/Command/TestEnableMasterKey.php
@@ -28,6 +28,9 @@ namespace OCA\Encryption\Tests\Command;
 use OCA\Encryption\Command\EnableMasterKey;
 use OCA\Encryption\Util;
 use OCP\IConfig;
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Test\TestCase;
 
 class TestEnableMasterKey extends TestCase {
@@ -53,15 +56,15 @@ class TestEnableMasterKey extends TestCase {
 	public function setUp() {
 		parent::setUp();
 
-		$this->util = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->util = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()->getMock();
 		$this->config = $this->getMockBuilder(IConfig::class)
 			->disableOriginalConstructor()->getMock();
-		$this->questionHelper = $this->getMockBuilder('Symfony\Component\Console\Helper\QuestionHelper')
+		$this->questionHelper = $this->getMockBuilder(QuestionHelper::class)
 			->disableOriginalConstructor()->getMock();
-		$this->output = $this->getMockBuilder('Symfony\Component\Console\Output\OutputInterface')
+		$this->output = $this->getMockBuilder(OutputInterface::class)
 			->disableOriginalConstructor()->getMock();
-		$this->input = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')
+		$this->input = $this->getMockBuilder(InputInterface::class)
 			->disableOriginalConstructor()->getMock();
 
 		$this->enableMasterKey = new EnableMasterKey($this->util, $this->config, $this->questionHelper);
diff --git a/apps/encryption/tests/Controller/RecoveryControllerTest.php b/apps/encryption/tests/Controller/RecoveryControllerTest.php
index 384cce94c4..7ab3bc7eeb 100644
--- a/apps/encryption/tests/Controller/RecoveryControllerTest.php
+++ b/apps/encryption/tests/Controller/RecoveryControllerTest.php
@@ -26,6 +26,7 @@ namespace OCA\Encryption\Tests\Controller;
 
 
 use OCA\Encryption\Controller\RecoveryController;
+use OCA\Encryption\Recovery;
 use OCP\AppFramework\Http;
 use OCP\IConfig;
 use OCP\IL10N;
@@ -171,7 +172,7 @@ class RecoveryControllerTest extends TestCase {
 			->method('t')
 			->willReturnArgument(0);
 
-		$this->recoveryMock = $this->getMockBuilder('OCA\Encryption\Recovery')
+		$this->recoveryMock = $this->getMockBuilder(Recovery::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/encryption/tests/Controller/SettingsControllerTest.php b/apps/encryption/tests/Controller/SettingsControllerTest.php
index fcff78d77d..aceb94b23f 100644
--- a/apps/encryption/tests/Controller/SettingsControllerTest.php
+++ b/apps/encryption/tests/Controller/SettingsControllerTest.php
@@ -24,11 +24,16 @@
 namespace OCA\Encryption\Tests\Controller;
 
 use OCA\Encryption\Controller\SettingsController;
+use OCA\Encryption\Crypto\Crypt;
+use OCA\Encryption\KeyManager;
 use OCA\Encryption\Session;
+use OCA\Encryption\Util;
 use OCP\AppFramework\Http;
 use OCP\IL10N;
 use OCP\IRequest;
+use OCP\ISession;
 use OCP\IUserManager;
+use OCP\IUserSession;
 use Test\TestCase;
 
 class SettingsControllerTest extends TestCase {
@@ -81,13 +86,13 @@ class SettingsControllerTest extends TestCase {
 		$this->userManagerMock = $this->getMockBuilder(IUserManager::class)
 			->disableOriginalConstructor()->getMock();
 
-		$this->keyManagerMock = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()->getMock();
 
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()->getMock();
 
-		$this->userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$this->userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->setMethods([
 				'isLoggedIn',
@@ -100,7 +105,7 @@ class SettingsControllerTest extends TestCase {
 			])
 			->getMock();
 
-		$this->ocSessionMock = $this->getMockBuilder('OCP\ISession')->disableOriginalConstructor()->getMock();
+		$this->ocSessionMock = $this->getMockBuilder(ISession::class)->disableOriginalConstructor()->getMock();
 
 		$this->userSessionMock->expects($this->any())
 			->method('getUID')
@@ -110,10 +115,10 @@ class SettingsControllerTest extends TestCase {
 			->method($this->anything())
 			->will($this->returnSelf());
 
-		$this->sessionMock = $this->getMockBuilder('OCA\Encryption\Session')
+		$this->sessionMock = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()->getMock();
 
-		$this->utilMock = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->utilMock = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/encryption/tests/Controller/StatusControllerTest.php b/apps/encryption/tests/Controller/StatusControllerTest.php
index cd3a8fdaa7..d72fcd1ac3 100644
--- a/apps/encryption/tests/Controller/StatusControllerTest.php
+++ b/apps/encryption/tests/Controller/StatusControllerTest.php
@@ -53,7 +53,7 @@ class StatusControllerTest extends TestCase {
 
 		parent::setUp();
 
-		$this->sessionMock = $this->getMockBuilder('OCA\Encryption\Session')
+		$this->sessionMock = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()->getMock();
 		$this->requestMock = $this->createMock(IRequest::class);
 
diff --git a/apps/encryption/tests/Crypto/CryptTest.php b/apps/encryption/tests/Crypto/CryptTest.php
index 4800be0a5e..ace4453a80 100644
--- a/apps/encryption/tests/Crypto/CryptTest.php
+++ b/apps/encryption/tests/Crypto/CryptTest.php
@@ -30,6 +30,7 @@ use OCA\Encryption\Crypto\Crypt;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\ILogger;
+use OCP\IUserSession;
 use Test\TestCase;
 
 class CryptTest extends TestCase {
@@ -59,7 +60,7 @@ class CryptTest extends TestCase {
 		$this->logger->expects($this->any())
 			->method('warning')
 			->willReturn(true);
-		$this->userSession = $this->getMockBuilder('OCP\IUserSession')
+		$this->userSession = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->config = $this->getMockBuilder(IConfig::class)
@@ -391,7 +392,7 @@ class CryptTest extends TestCase {
 	 */
 	public function testDecryptPrivateKey($header, $privateKey, $expectedCipher, $isValidKey, $expected) {
 		/** @var \OCA\Encryption\Crypto\Crypt | \PHPUnit_Framework_MockObject_MockObject $crypt */
-		$crypt = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$crypt = $this->getMockBuilder(Crypt::class)
 			->setConstructorArgs(
 				[
 					$this->logger,
diff --git a/apps/encryption/tests/Crypto/DecryptAllTest.php b/apps/encryption/tests/Crypto/DecryptAllTest.php
index fdef37adc8..99b1b47ba8 100644
--- a/apps/encryption/tests/Crypto/DecryptAllTest.php
+++ b/apps/encryption/tests/Crypto/DecryptAllTest.php
@@ -56,15 +56,15 @@ class DecryptAllTest extends TestCase {
 	public function setUp() {
 		parent::setUp();
 
-		$this->util = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->util = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()->getMock();
-		$this->keyManager = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManager = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()->getMock();
-		$this->crypt = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->crypt = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()->getMock();
-		$this->session = $this->getMockBuilder('OCA\Encryption\Session')
+		$this->session = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()->getMock();
-		$this->questionHelper = $this->getMockBuilder('Symfony\Component\Console\Helper\QuestionHelper')
+		$this->questionHelper = $this->getMockBuilder(QuestionHelper::class)
 			->disableOriginalConstructor()->getMock();
 
 		$this->instance = new DecryptAll(
diff --git a/apps/encryption/tests/Crypto/EncryptAllTest.php b/apps/encryption/tests/Crypto/EncryptAllTest.php
index 7d432a6d52..38b64a8b6b 100644
--- a/apps/encryption/tests/Crypto/EncryptAllTest.php
+++ b/apps/encryption/tests/Crypto/EncryptAllTest.php
@@ -25,13 +25,22 @@
 namespace OCA\Encryption\Tests\Crypto;
 
 
+use OC\Files\View;
 use OCA\Encryption\Crypto\EncryptAll;
+use OCA\Encryption\KeyManager;
+use OCA\Encryption\Users\Setup;
+use OCA\Encryption\Util;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IUserManager;
 use OCP\Mail\IMailer;
+use OCP\Security\ISecureRandom;
 use OCP\UserInterface;
 use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+use Symfony\Component\Console\Helper\ProgressBar;
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Test\TestCase;
 
 class EncryptAllTest extends TestCase {
@@ -80,15 +89,15 @@ class EncryptAllTest extends TestCase {
 
 	function setUp() {
 		parent::setUp();
-		$this->setupUser = $this->getMockBuilder('OCA\Encryption\Users\Setup')
+		$this->setupUser = $this->getMockBuilder(Setup::class)
 			->disableOriginalConstructor()->getMock();
-		$this->keyManager = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManager = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()->getMock();
-		$this->util = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->util = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()->getMock();
 		$this->userManager = $this->getMockBuilder(IUserManager::class)
 			->disableOriginalConstructor()->getMock();
-		$this->view = $this->getMockBuilder('OC\Files\View')
+		$this->view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
 		$this->config = $this->getMockBuilder(IConfig::class)
 			->disableOriginalConstructor()->getMock();
@@ -96,11 +105,11 @@ class EncryptAllTest extends TestCase {
 			->disableOriginalConstructor()->getMock();
 		$this->l = $this->getMockBuilder(IL10N::class)
 			->disableOriginalConstructor()->getMock();
-		$this->questionHelper = $this->getMockBuilder('Symfony\Component\Console\Helper\QuestionHelper')
+		$this->questionHelper = $this->getMockBuilder(QuestionHelper::class)
 			->disableOriginalConstructor()->getMock();
-		$this->inputInterface = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')
+		$this->inputInterface = $this->getMockBuilder(InputInterface::class)
 			->disableOriginalConstructor()->getMock();
-		$this->outputInterface = $this->getMockBuilder('Symfony\Component\Console\Output\OutputInterface')
+		$this->outputInterface = $this->getMockBuilder(OutputInterface::class)
 			->disableOriginalConstructor()->getMock();
 		$this->userInterface = $this->getMockBuilder(UserInterface::class)
 			->disableOriginalConstructor()->getMock();
@@ -112,7 +121,7 @@ class EncryptAllTest extends TestCase {
 		$this->userManager->expects($this->any())->method('getBackends')->willReturn([$this->userInterface]);
 		$this->userInterface->expects($this->any())->method('getUsers')->willReturn(['user1', 'user2']);
 
-		$this->secureRandom = $this->getMockBuilder('OCP\Security\ISecureRandom')->disableOriginalConstructor()->getMock();
+		$this->secureRandom = $this->getMockBuilder(ISecureRandom::class)->disableOriginalConstructor()->getMock();
 		$this->secureRandom->expects($this->any())->method('getMediumStrengthGenerator')->willReturn($this->secureRandom);
 		$this->secureRandom->expects($this->any())->method('getLowStrengthGenerator')->willReturn($this->secureRandom);
 		$this->secureRandom->expects($this->any())->method('generate')->willReturn('12345678');
@@ -134,7 +143,7 @@ class EncryptAllTest extends TestCase {
 
 	public function testEncryptAll() {
 		/** @var EncryptAll  | \PHPUnit_Framework_MockObject_MockObject  $encryptAll */
-		$encryptAll = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$encryptAll = $this->getMockBuilder(EncryptAll::class)
 			->setConstructorArgs(
 				[
 					$this->setupUser,
@@ -163,7 +172,7 @@ class EncryptAllTest extends TestCase {
 
 	public function testEncryptAllWithMasterKey() {
 		/** @var EncryptAll  | \PHPUnit_Framework_MockObject_MockObject  $encryptAll */
-		$encryptAll = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$encryptAll = $this->getMockBuilder(EncryptAll::class)
 			->setConstructorArgs(
 				[
 					$this->setupUser,
@@ -193,7 +202,7 @@ class EncryptAllTest extends TestCase {
 
 	public function testCreateKeyPairs() {
 		/** @var EncryptAll  | \PHPUnit_Framework_MockObject_MockObject  $encryptAll */
-		$encryptAll = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$encryptAll = $this->getMockBuilder(EncryptAll::class)
 			->setConstructorArgs(
 				[
 					$this->setupUser,
@@ -242,7 +251,7 @@ class EncryptAllTest extends TestCase {
 
 	public function testEncryptAllUsersFiles() {
 		/** @var EncryptAll  | \PHPUnit_Framework_MockObject_MockObject  $encryptAll */
-		$encryptAll = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$encryptAll = $this->getMockBuilder(EncryptAll::class)
 			->setConstructorArgs(
 				[
 					$this->setupUser,
@@ -275,7 +284,7 @@ class EncryptAllTest extends TestCase {
 
 	public function testEncryptUsersFiles() {
 		/** @var EncryptAll  | \PHPUnit_Framework_MockObject_MockObject  $encryptAll */
-		$encryptAll = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$encryptAll = $this->getMockBuilder(EncryptAll::class)
 			->setConstructorArgs(
 				[
 					$this->setupUser,
@@ -323,7 +332,7 @@ class EncryptAllTest extends TestCase {
 		$encryptAll->expects($this->at(1))->method('encryptFile')->with('/user1/files/bar');
 		$encryptAll->expects($this->at(2))->method('encryptFile')->with('/user1/files/foo/subfile');
 
-		$progressBar = $this->getMockBuilder('Symfony\Component\Console\Helper\ProgressBar')
+		$progressBar = $this->getMockBuilder(ProgressBar::class)
 			->disableOriginalConstructor()->getMock();
 
 		$this->invokePrivate($encryptAll, 'encryptUsersFiles', ['user1', $progressBar, '']);
diff --git a/apps/encryption/tests/Crypto/EncryptionTest.php b/apps/encryption/tests/Crypto/EncryptionTest.php
index 3bd4593d6b..42da71b0eb 100644
--- a/apps/encryption/tests/Crypto/EncryptionTest.php
+++ b/apps/encryption/tests/Crypto/EncryptionTest.php
@@ -23,7 +23,14 @@
 
 namespace OCA\Encryption\Tests\Crypto;
 
+use OCA\Encryption\Crypto\Crypt;
+use OCA\Encryption\Crypto\DecryptAll;
+use OCA\Encryption\Crypto\EncryptAll;
 use OCA\Encryption\Exceptions\PublicKeyMissingException;
+use OCA\Encryption\KeyManager;
+use OCA\Encryption\Session;
+use OCA\Encryption\Util;
+use OCP\Files\Storage;
 use OCP\IL10N;
 use OCP\ILogger;
 use Symfony\Component\Console\Input\InputInterface;
@@ -66,24 +73,24 @@ class EncryptionTest extends TestCase {
 	public function setUp() {
 		parent::setUp();
 
-		$this->storageMock = $this->getMockBuilder('OCP\Files\Storage')
+		$this->storageMock = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()->getMock();
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->utilMock = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->utilMock = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->keyManagerMock = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->sessionMock = $this->getMockBuilder('OCA\Encryption\Session')
+		$this->sessionMock = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->encryptAllMock = $this->getMockBuilder('OCA\Encryption\Crypto\EncryptAll')
+		$this->encryptAllMock = $this->getMockBuilder(EncryptAll::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->decryptAllMock = $this->getMockBuilder('OCA\Encryption\Crypto\DecryptAll')
+		$this->decryptAllMock = $this->getMockBuilder(DecryptAll::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->loggerMock = $this->getMockBuilder(ILogger::class)
diff --git a/apps/encryption/tests/HookManagerTest.php b/apps/encryption/tests/HookManagerTest.php
index c5e5487dba..109afb1ef8 100644
--- a/apps/encryption/tests/HookManagerTest.php
+++ b/apps/encryption/tests/HookManagerTest.php
@@ -26,6 +26,7 @@ namespace OCA\Encryption\Tests;
 
 
 use OCA\Encryption\HookManager;
+use OCA\Encryption\Hooks\Contracts\IHook;
 use OCP\IConfig;
 use Test\TestCase;
 
@@ -41,8 +42,8 @@ class HookManagerTest extends TestCase {
 	 */
 	public function testRegisterHookWithArray() {
 		self::$instance->registerHook([
-			$this->getMockBuilder('OCA\Encryption\Hooks\Contracts\IHook')->disableOriginalConstructor()->getMock(),
-			$this->getMockBuilder('OCA\Encryption\Hooks\Contracts\IHook')->disableOriginalConstructor()->getMock(),
+			$this->getMockBuilder(IHook::class)->disableOriginalConstructor()->getMock(),
+			$this->getMockBuilder(IHook::class)->disableOriginalConstructor()->getMock(),
 			$this->createMock(IConfig::class)
 		]);
 
@@ -66,7 +67,7 @@ class HookManagerTest extends TestCase {
 	 *
 	 */
 	public function testRegisterHooksWithInstance() {
-		$mock = $this->getMockBuilder('OCA\Encryption\Hooks\Contracts\IHook')->disableOriginalConstructor()->getMock();
+		$mock = $this->getMockBuilder(IHook::class)->disableOriginalConstructor()->getMock();
 		/** @var \OCA\Encryption\Hooks\Contracts\IHook $mock */
 		self::$instance->registerHook($mock);
 
diff --git a/apps/encryption/tests/Hooks/UserHooksTest.php b/apps/encryption/tests/Hooks/UserHooksTest.php
index 506f46eb8e..f4c7a5ae0f 100644
--- a/apps/encryption/tests/Hooks/UserHooksTest.php
+++ b/apps/encryption/tests/Hooks/UserHooksTest.php
@@ -29,9 +29,15 @@ namespace OCA\Encryption\Tests\Hooks;
 
 use OCA\Encryption\Crypto\Crypt;
 use OCA\Encryption\Hooks\UserHooks;
+use OCA\Encryption\KeyManager;
+use OCA\Encryption\Recovery;
+use OCA\Encryption\Session;
+use OCA\Encryption\Users\Setup;
+use OCA\Encryption\Util;
 use OCP\ILogger;
 use OCP\IUser;
 use OCP\IUserManager;
+use OCP\IUserSession;
 use Test\TestCase;
 
 /**
@@ -152,7 +158,7 @@ class UserHooksTest extends TestCase {
 	public function testPreSetPassphrase($canChange) {
 
 		/** @var UserHooks | \PHPUnit_Framework_MockObject_MockObject  $instance */
-		$instance = $this->getMockBuilder('OCA\Encryption\Hooks\UserHooks')
+		$instance = $this->getMockBuilder(UserHooks::class)
 			->setConstructorArgs(
 				[
 					$this->keyManagerMock,
@@ -231,7 +237,7 @@ class UserHooksTest extends TestCase {
 			->willReturnOnConsecutiveCalls(true, false);
 
 
-		$this->instance = $this->getMockBuilder('OCA\Encryption\Hooks\UserHooks')
+		$this->instance = $this->getMockBuilder(UserHooks::class)
 			->setConstructorArgs(
 				[
 					$this->keyManagerMock,
@@ -292,7 +298,7 @@ class UserHooksTest extends TestCase {
 			->method('getPrivateKey')
 			->willReturn(true);
 
-		$userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->getMock();
 
@@ -303,7 +309,7 @@ class UserHooksTest extends TestCase {
 			->with('testUser')
 			->willReturn(false);
 
-		$userHooks = $this->getMockBuilder('OCA\Encryption\Hooks\UserHooks')
+		$userHooks = $this->getMockBuilder(UserHooks::class)
 			->setConstructorArgs(
 				[
 					$this->keyManagerMock,
@@ -325,17 +331,17 @@ class UserHooksTest extends TestCase {
 	protected function setUp() {
 		parent::setUp();
 		$this->loggerMock = $this->createMock(ILogger::class);
-		$this->keyManagerMock = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->userManagerMock = $this->getMockBuilder(IUserManager::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->userSetupMock = $this->getMockBuilder('OCA\Encryption\Users\Setup')
+		$this->userSetupMock = $this->getMockBuilder(Setup::class)
 			->disableOriginalConstructor()
 			->getMock();
 
-		$this->userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$this->userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->setMethods([
 				'isLoggedIn',
@@ -354,18 +360,18 @@ class UserHooksTest extends TestCase {
 			->method($this->anything())
 			->will($this->returnSelf());
 
-		$utilMock = $this->getMockBuilder('OCA\Encryption\Util')
+		$utilMock = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()
 			->getMock();
 
-		$sessionMock = $this->getMockBuilder('OCA\Encryption\Session')
+		$sessionMock = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()
 			->getMock();
 
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$recoveryMock = $this->getMockBuilder('OCA\Encryption\Recovery')
+		$recoveryMock = $this->getMockBuilder(Recovery::class)
 			->disableOriginalConstructor()
 			->getMock();
 
@@ -374,7 +380,7 @@ class UserHooksTest extends TestCase {
 		$this->utilMock = $utilMock;
 		$this->utilMock->expects($this->any())->method('isMasterKeyEnabled')->willReturn(false);
 
-		$this->instance = $this->getMockBuilder('OCA\Encryption\Hooks\UserHooks')
+		$this->instance = $this->getMockBuilder(UserHooks::class)
 			->setConstructorArgs(
 				[
 					$this->keyManagerMock,
diff --git a/apps/encryption/tests/KeyManagerTest.php b/apps/encryption/tests/KeyManagerTest.php
index a8441427a2..721b7f53a0 100644
--- a/apps/encryption/tests/KeyManagerTest.php
+++ b/apps/encryption/tests/KeyManagerTest.php
@@ -27,9 +27,15 @@
 namespace OCA\Encryption\Tests;
 
 
+use OC\Files\FileInfo;
+use OC\Files\View;
+use OCA\Encryption\Crypto\Crypt;
 use OCA\Encryption\KeyManager;
 use OCA\Encryption\Session;
+use OCA\Encryption\Util;
 use OCP\Encryption\Keys\IStorage;
+use OCP\Files\Cache\ICache;
+use OCP\Files\Storage;
 use OCP\IConfig;
 use OCP\ILogger;
 use OCP\IUserSession;
@@ -74,7 +80,7 @@ class KeyManagerTest extends TestCase {
 		$this->userId = 'user1';
 		$this->systemKeyId = 'systemKeyId';
 		$this->keyStorageMock = $this->createMock(IStorage::class);
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->configMock = $this->createMock(IConfig::class);
@@ -82,11 +88,11 @@ class KeyManagerTest extends TestCase {
 			->method('getAppValue')
 			->willReturn($this->systemKeyId);
 		$this->userMock = $this->createMock(IUserSession::class);
-		$this->sessionMock = $this->getMockBuilder('OCA\Encryption\Session')
+		$this->sessionMock = $this->getMockBuilder(Session::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->logMock = $this->createMock(ILogger::class);
-		$this->utilMock = $this->getMockBuilder('OCA\Encryption\Util')
+		$this->utilMock = $this->getMockBuilder(Util::class)
 			->disableOriginalConstructor()
 			->getMock();
 
@@ -251,7 +257,7 @@ class KeyManagerTest extends TestCase {
 	public function testInit($useMasterKey) {
 
 		/** @var \OCA\Encryption\KeyManager|\PHPUnit_Framework_MockObject_MockObject $instance */
-		$instance = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$instance = $this->getMockBuilder(KeyManager::class)
 			->setConstructorArgs(
 				[
 					$this->keyStorageMock,
@@ -544,7 +550,7 @@ class KeyManagerTest extends TestCase {
 	public function testValidateMasterKey($masterKey) {
 
 		/** @var \OCA\Encryption\KeyManager | \PHPUnit_Framework_MockObject_MockObject $instance */
-		$instance = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$instance = $this->getMockBuilder(KeyManager::class)
 			->setConstructorArgs(
 				[
 					$this->keyStorageMock,
@@ -592,7 +598,7 @@ class KeyManagerTest extends TestCase {
 	}
 
 	public function testGetVersionWithoutFileInfo() {
-		$view = $this->getMockBuilder('\\OC\\Files\\View')
+		$view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
 		$view->expects($this->once())
 			->method('getFileInfo')
@@ -604,9 +610,9 @@ class KeyManagerTest extends TestCase {
 	}
 
 	public function testGetVersionWithFileInfo() {
-		$view = $this->getMockBuilder('\\OC\\Files\\View')
+		$view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
-		$fileInfo = $this->getMockBuilder('\\OC\\Files\\FileInfo')
+		$fileInfo = $this->getMockBuilder(FileInfo::class)
 			->disableOriginalConstructor()->getMock();
 		$fileInfo->expects($this->once())
 			->method('getEncryptedVersion')
@@ -621,19 +627,19 @@ class KeyManagerTest extends TestCase {
 	}
 
 	public function testSetVersionWithFileInfo() {
-		$view = $this->getMockBuilder('\\OC\\Files\\View')
+		$view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
-		$cache = $this->getMockBuilder('\\OCP\\Files\\Cache\\ICache')
+		$cache = $this->getMockBuilder(ICache::class)
 			->disableOriginalConstructor()->getMock();
 		$cache->expects($this->once())
 			->method('update')
 			->with(123, ['encrypted' => 5, 'encryptedVersion' => 5]);
-		$storage = $this->getMockBuilder('\\OCP\\Files\\Storage')
+		$storage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()->getMock();
 		$storage->expects($this->once())
 			->method('getCache')
 			->willReturn($cache);
-		$fileInfo = $this->getMockBuilder('\\OC\\Files\\FileInfo')
+		$fileInfo = $this->getMockBuilder(FileInfo::class)
 			->disableOriginalConstructor()->getMock();
 		$fileInfo->expects($this->once())
 			->method('getStorage')
@@ -651,7 +657,7 @@ class KeyManagerTest extends TestCase {
 	}
 
 	public function testSetVersionWithoutFileInfo() {
-		$view = $this->getMockBuilder('\\OC\\Files\\View')
+		$view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
 		$view->expects($this->once())
 			->method('getFileInfo')
diff --git a/apps/encryption/tests/RecoveryTest.php b/apps/encryption/tests/RecoveryTest.php
index d73b5d48c9..2dda774565 100644
--- a/apps/encryption/tests/RecoveryTest.php
+++ b/apps/encryption/tests/RecoveryTest.php
@@ -28,10 +28,13 @@ namespace OCA\Encryption\Tests;
 
 
 use OC\Files\View;
+use OCA\Encryption\Crypto\Crypt;
+use OCA\Encryption\KeyManager;
 use OCA\Encryption\Recovery;
 use OCP\Encryption\IFile;
 use OCP\Encryption\Keys\IStorage;
 use OCP\IConfig;
+use OCP\IUserSession;
 use OCP\Security\ISecureRandom;
 use Test\TestCase;
 
@@ -253,7 +256,7 @@ class RecoveryTest extends TestCase {
 		parent::setUp();
 
 
-		$this->userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$this->userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->setMethods([
 				'isLoggedIn',
@@ -271,10 +274,10 @@ class RecoveryTest extends TestCase {
 			->method($this->anything())
 			->will($this->returnSelf());
 
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')->disableOriginalConstructor()->getMock();
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)->disableOriginalConstructor()->getMock();
 		/** @var \OCP\Security\ISecureRandom $randomMock */
 		$randomMock = $this->createMock(ISecureRandom::class);
-		$this->keyManagerMock = $this->getMockBuilder('OCA\Encryption\KeyManager')->disableOriginalConstructor()->getMock();
+		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)->disableOriginalConstructor()->getMock();
 		$this->configMock = $this->createMock(IConfig::class);
 		/** @var \OCP\Encryption\Keys\IStorage $keyStorageMock */
 		$keyStorageMock = $this->createMock(IStorage::class);
diff --git a/apps/encryption/tests/Users/SetupTest.php b/apps/encryption/tests/Users/SetupTest.php
index 9e85686104..27866ef392 100644
--- a/apps/encryption/tests/Users/SetupTest.php
+++ b/apps/encryption/tests/Users/SetupTest.php
@@ -26,8 +26,11 @@
 namespace OCA\Encryption\Tests\Users;
 
 
+use OCA\Encryption\Crypto\Crypt;
+use OCA\Encryption\KeyManager;
 use OCA\Encryption\Users\Setup;
 use OCP\ILogger;
+use OCP\IUserSession;
 use Test\TestCase;
 
 class SetupTest extends TestCase {
@@ -47,14 +50,14 @@ class SetupTest extends TestCase {
 	protected function setUp() {
 		parent::setUp();
 		$logMock = $this->createMock(ILogger::class);
-		$userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$this->cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$this->cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()
 			->getMock();
 
-		$this->keyManagerMock = $this->getMockBuilder('OCA\Encryption\KeyManager')
+		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/encryption/tests/UtilTest.php b/apps/encryption/tests/UtilTest.php
index 40fc553725..e59565d3b8 100644
--- a/apps/encryption/tests/UtilTest.php
+++ b/apps/encryption/tests/UtilTest.php
@@ -27,11 +27,14 @@ namespace OCA\Encryption\Tests;
 
 
 use OC\Files\View;
+use OCA\Encryption\Crypto\Crypt;
 use OCA\Encryption\Util;
 use OCP\Files\Mount\IMountPoint;
+use OCP\Files\Storage;
 use OCP\IConfig;
 use OCP\ILogger;
 use OCP\IUserManager;
+use OCP\IUserSession;
 use Test\TestCase;
 
 class UtilTest extends TestCase {
@@ -80,13 +83,13 @@ class UtilTest extends TestCase {
 		$this->userManagerMock = $this->createMock(IUserManager::class);
 
 		/** @var \OCA\Encryption\Crypto\Crypt $cryptMock */
-		$cryptMock = $this->getMockBuilder('OCA\Encryption\Crypto\Crypt')
+		$cryptMock = $this->getMockBuilder(Crypt::class)
 			->disableOriginalConstructor()
 			->getMock();
 		/** @var \OCP\ILogger $loggerMock */
 		$loggerMock = $this->createMock(ILogger::class);
 		/** @var \OCP\IUserSession|\PHPUnit_Framework_MockObject_MockObject $userSessionMock */
-		$userSessionMock = $this->getMockBuilder('OCP\IUserSession')
+		$userSessionMock = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->setMethods([
 				'isLoggedIn',
@@ -205,7 +208,7 @@ class UtilTest extends TestCase {
 	}
 
 	public function testGetStorage() {
-		$return = $this->getMockBuilder('OC\Files\Storage\Storage')
+		$return = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/federatedfilesharing/tests/Controller/MountPublicLinkControllerTest.php b/apps/federatedfilesharing/tests/Controller/MountPublicLinkControllerTest.php
index a565102a08..cef341fdc8 100644
--- a/apps/federatedfilesharing/tests/Controller/MountPublicLinkControllerTest.php
+++ b/apps/federatedfilesharing/tests/Controller/MountPublicLinkControllerTest.php
@@ -95,9 +95,9 @@ class MountPublicLinkControllerTest extends \Test\TestCase {
 		$this->rootFolder = $this->getMockBuilder('OCP\Files\IRootFolder')->disableOriginalConstructor()->getMock();
 		$this->userManager = $this->getMockBuilder(IUserManager::class)->disableOriginalConstructor()->getMock();
 		$this->share = new \OC\Share20\Share($this->rootFolder, $this->userManager);
-		$this->session = $this->getMockBuilder('OCP\ISession')->disableOriginalConstructor()->getMock();
+		$this->session = $this->getMockBuilder(ISession::class)->disableOriginalConstructor()->getMock();
 		$this->l10n = $this->getMockBuilder(IL10N::class)->disableOriginalConstructor()->getMock();
-		$this->userSession = $this->getMockBuilder('OCP\IUserSession')->disableOriginalConstructor()->getMock();
+		$this->userSession = $this->getMockBuilder(IUserSession::class)->disableOriginalConstructor()->getMock();
 		$this->clientService = $this->getMockBuilder('OCP\Http\Client\IClientService')->disableOriginalConstructor()->getMock();
 		$this->cloudIdManager = new CloudIdManager();
 
diff --git a/apps/federatedfilesharing/tests/TokenHandlerTest.php b/apps/federatedfilesharing/tests/TokenHandlerTest.php
index 10e5fc5df5..2025b90e00 100644
--- a/apps/federatedfilesharing/tests/TokenHandlerTest.php
+++ b/apps/federatedfilesharing/tests/TokenHandlerTest.php
@@ -42,7 +42,7 @@ class TokenHandlerTest extends \Test\TestCase {
 	public function setUp() {
 		parent::setUp();
 
-		$this->secureRandom = $this->getMockBuilder('OCP\Security\ISecureRandom')->getMock();
+		$this->secureRandom = $this->getMockBuilder(ISecureRandom::class)->getMock();
 
 		$this->tokenHandler = new TokenHandler($this->secureRandom);
 	}
diff --git a/apps/files/tests/Command/DeleteOrphanedFilesTest.php b/apps/files/tests/Command/DeleteOrphanedFilesTest.php
index 32c8d628a8..8c48b9feca 100644
--- a/apps/files/tests/Command/DeleteOrphanedFilesTest.php
+++ b/apps/files/tests/Command/DeleteOrphanedFilesTest.php
@@ -27,6 +27,8 @@ namespace OCA\Files\Tests\Command;
 use OC\Files\View;
 use OCA\Files\Command\DeleteOrphanedFiles;
 use OCP\Files\StorageNotAvailableException;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Test\TestCase;
 
 /**
@@ -87,10 +89,10 @@ class DeleteOrphanedFilesTest extends TestCase {
 	 * Test clearing orphaned files
 	 */
 	public function testClearFiles() {
-		$input = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')
+		$input = $this->getMockBuilder(InputInterface::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$output = $this->getMockBuilder('Symfony\Component\Console\Output\OutputInterface')
+		$output = $this->getMockBuilder(OutputInterface::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/files_sharing/tests/Command/CleanupRemoteStoragesTest.php b/apps/files_sharing/tests/Command/CleanupRemoteStoragesTest.php
index 827fcc1579..5480874615 100644
--- a/apps/files_sharing/tests/Command/CleanupRemoteStoragesTest.php
+++ b/apps/files_sharing/tests/Command/CleanupRemoteStoragesTest.php
@@ -22,6 +22,8 @@
 namespace OCA\Files_Sharing\Tests\Command;
 
 use OCA\Files_Sharing\Command\CleanupRemoteStorages;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Test\TestCase;
 
 /**
@@ -158,10 +160,10 @@ class CleanupRemoteStoragesTest extends TestCase {
 	 * Test cleanup of orphaned storages
 	 */
 	public function testCleanup() {
-		$input = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')
+		$input = $this->getMockBuilder(InputInterface::class)
 			->disableOriginalConstructor()
 			->getMock();
-		$output = $this->getMockBuilder('Symfony\Component\Console\Output\OutputInterface')
+		$output = $this->getMockBuilder(OutputInterface::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/apps/files_sharing/tests/Controller/ShareAPIControllerTest.php b/apps/files_sharing/tests/Controller/ShareAPIControllerTest.php
index e73ebb62c6..3bebb9e119 100644
--- a/apps/files_sharing/tests/Controller/ShareAPIControllerTest.php
+++ b/apps/files_sharing/tests/Controller/ShareAPIControllerTest.php
@@ -264,7 +264,7 @@ class ShareAPIControllerTest extends TestCase {
 			->getMock();
 		$cache->method('getNumericStorageId')->willReturn(101);
 
-		$storage = $this->getMockBuilder('OC\Files\Storage\Storage')
+		$storage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$storage->method('getId')->willReturn('STORAGE');
@@ -637,7 +637,7 @@ class ShareAPIControllerTest extends TestCase {
 			->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(File::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -669,7 +669,7 @@ class ShareAPIControllerTest extends TestCase {
 			->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(File::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -714,7 +714,7 @@ class ShareAPIControllerTest extends TestCase {
 				->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(File::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -768,7 +768,7 @@ class ShareAPIControllerTest extends TestCase {
 				->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(File::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -820,7 +820,7 @@ class ShareAPIControllerTest extends TestCase {
 			->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -872,7 +872,7 @@ class ShareAPIControllerTest extends TestCase {
 			->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -904,7 +904,7 @@ class ShareAPIControllerTest extends TestCase {
 			]));
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -923,7 +923,7 @@ class ShareAPIControllerTest extends TestCase {
 	 */
 	public function testCreateShareLinkNoPublicUpload() {
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -943,7 +943,7 @@ class ShareAPIControllerTest extends TestCase {
 	 */
 	public function testCreateShareLinkPublicUploadFile() {
 		$path = $this->getMockBuilder(File::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -962,7 +962,7 @@ class ShareAPIControllerTest extends TestCase {
 		$ocs = $this->mockFormatShare();
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -996,7 +996,7 @@ class ShareAPIControllerTest extends TestCase {
 		$ocs = $this->mockFormatShare();
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -1040,7 +1040,7 @@ class ShareAPIControllerTest extends TestCase {
 			]));
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -1081,7 +1081,7 @@ class ShareAPIControllerTest extends TestCase {
 		$ocs = $this->mockFormatShare();
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(false);
@@ -1126,7 +1126,7 @@ class ShareAPIControllerTest extends TestCase {
 			->willReturn($userFolder);
 
 		$path = $this->getMockBuilder(Folder::class)->getMock();
-		$storage = $this->getMockBuilder('OCP\Files\Storage')->getMock();
+		$storage = $this->getMockBuilder(Storage::class)->getMock();
 		$storage->method('instanceOfStorage')
 			->with('OCA\Files_Sharing\External\Storage')
 			->willReturn(true);
diff --git a/apps/provisioning_api/tests/Controller/GroupsControllerTest.php b/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
index 9d70e123cd..cd3dae7933 100644
--- a/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
+++ b/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
@@ -58,7 +58,7 @@ class GroupsControllerTest extends \Test\TestCase {
 			->method('getSubAdmin')
 			->willReturn($this->subAdminManager);
 
-		$this->userSession = $this->getMockBuilder('OCP\IUserSession')
+		$this->userSession = $this->getMockBuilder(IUserSession::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$request = $this->getMockBuilder(IRequest::class)
diff --git a/tests/lib/Encryption/DecryptAllTest.php b/tests/lib/Encryption/DecryptAllTest.php
index c52619c3b1..06c5e0e2df 100644
--- a/tests/lib/Encryption/DecryptAllTest.php
+++ b/tests/lib/Encryption/DecryptAllTest.php
@@ -28,9 +28,13 @@ use OC\Encryption\Exceptions\DecryptionFailedException;
 use OC\Encryption\Manager;
 use OC\Files\FileInfo;
 use OC\Files\View;
+use OCP\Files\Storage;
 use OCP\IUserManager;
 use OCP\UserInterface;
 use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+use Symfony\Component\Console\Helper\ProgressBar;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Test\TestCase;
 
 /**
@@ -70,11 +74,11 @@ class DecryptAllTest extends TestCase {
 			->disableOriginalConstructor()->getMock();
 		$this->encryptionManager = $this->getMockBuilder('OC\Encryption\Manager')
 			->disableOriginalConstructor()->getMock();
-		$this->view = $this->getMockBuilder('OC\Files\View')
+		$this->view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
-		$this->inputInterface = $this->getMockBuilder('Symfony\Component\Console\Input\InputInterface')
+		$this->inputInterface = $this->getMockBuilder(InputInterface::class)
 			->disableOriginalConstructor()->getMock();
-		$this->outputInterface = $this->getMockBuilder('Symfony\Component\Console\Output\OutputInterface')
+		$this->outputInterface = $this->getMockBuilder(OutputInterface::class)
 			->disableOriginalConstructor()->getMock();
 		$this->userInterface = $this->getMockBuilder(UserInterface::class)
 			->disableOriginalConstructor()->getMock();
@@ -253,11 +257,11 @@ class DecryptAllTest extends TestCase {
 			->setMethods(['decryptFile'])
 			->getMock();
 
-		$storage = $this->getMockBuilder('OCP\Files\Storage')
+		$storage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()->getMock();
 
 
-		$sharedStorage = $this->getMockBuilder('OCP\Files\Storage')
+		$sharedStorage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()->getMock();
 
 		$sharedStorage->expects($this->once())->method('instanceOfStorage')
@@ -296,7 +300,7 @@ class DecryptAllTest extends TestCase {
 			->method('decryptFile')
 			->with('/user1/files/foo/subfile');
 
-		$progressBar = $this->getMockBuilder('Symfony\Component\Console\Helper\ProgressBar')
+		$progressBar = $this->getMockBuilder(ProgressBar::class)
 			->disableOriginalConstructor()->getMock();
 
 		$this->invokePrivate($instance, 'decryptUsersFiles', ['user1', $progressBar, '']);
diff --git a/tests/lib/Encryption/EncryptionWrapperTest.php b/tests/lib/Encryption/EncryptionWrapperTest.php
index 6a6a3db2f6..d20efa8821 100644
--- a/tests/lib/Encryption/EncryptionWrapperTest.php
+++ b/tests/lib/Encryption/EncryptionWrapperTest.php
@@ -26,6 +26,7 @@ namespace Test\Encryption;
 use OC\Encryption\EncryptionWrapper;
 use OC\Encryption\Manager;
 use OC\Memcache\ArrayCache;
+use OCP\Files\Storage;
 use OCP\ILogger;
 use Test\TestCase;
 
@@ -59,7 +60,7 @@ class EncryptionWrapperTest extends TestCase {
 	 * @dataProvider provideWrapStorage
 	 */
 	public function testWrapStorage($expectedWrapped, $wrappedStorages) {
-		$storage = $this->getMockBuilder('OC\Files\Storage\Storage')
+		$storage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/tests/lib/Encryption/Keys/StorageTest.php b/tests/lib/Encryption/Keys/StorageTest.php
index a5924d1dc8..cd8f1e9b95 100644
--- a/tests/lib/Encryption/Keys/StorageTest.php
+++ b/tests/lib/Encryption/Keys/StorageTest.php
@@ -24,6 +24,7 @@
 namespace Test\Encryption\Keys;
 
 use OC\Encryption\Keys\Storage;
+use OC\Files\View;
 use OCP\IConfig;
 use Test\TestCase;
 
@@ -48,7 +49,7 @@ class StorageTest extends TestCase {
 			->disableOriginalConstructor()
 			->getMock();
 
-		$this->view = $this->getMockBuilder('OC\Files\View')
+		$this->view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/tests/lib/Encryption/UtilTest.php b/tests/lib/Encryption/UtilTest.php
index e313274516..1e1b21d367 100644
--- a/tests/lib/Encryption/UtilTest.php
+++ b/tests/lib/Encryption/UtilTest.php
@@ -3,6 +3,7 @@
 namespace Test\Encryption;
 
 use OC\Encryption\Util;
+use OC\Files\View;
 use OCP\Encryption\IEncryptionModule;
 use OCP\IConfig;
 use Test\TestCase;
@@ -33,7 +34,7 @@ class UtilTest extends TestCase {
 
 	public function setUp() {
 		parent::setUp();
-		$this->view = $this->getMockBuilder('OC\Files\View')
+		$this->view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
index 459abf3b64..c184752ff7 100644
--- a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
+++ b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
@@ -719,7 +719,7 @@ class EncryptionTest extends Storage {
 	}
 
 	public function testCopyBetweenStorageMinimumEncryptedVersion() {
-		$storage2 = $this->getMockBuilder('OCP\Files\Storage')
+		$storage2 = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
@@ -768,7 +768,7 @@ class EncryptionTest extends Storage {
 	 * @param bool $expectedEncrypted
 	 */
 	public function testCopyBetweenStorage($encryptionEnabled, $mountPointEncryptionEnabled, $expectedEncrypted) {
-		$storage2 = $this->getMockBuilder('OCP\Files\Storage')
+		$storage2 = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
@@ -830,11 +830,11 @@ class EncryptionTest extends Storage {
 	 */
 	public function  testCopyBetweenStorageVersions($sourceInternalPath, $targetInternalPath, $copyResult, $encrypted) {
 
-		$sourceStorage = $this->getMockBuilder('OCP\Files\Storage')
+		$sourceStorage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
-		$targetStorage = $this->getMockBuilder('OCP\Files\Storage')
+		$targetStorage = $this->getMockBuilder(Storage::class)
 			->disableOriginalConstructor()
 			->getMock();
 
diff --git a/tests/lib/Security/CertificateManagerTest.php b/tests/lib/Security/CertificateManagerTest.php
index 6bdb647abc..2804ad99c0 100644
--- a/tests/lib/Security/CertificateManagerTest.php
+++ b/tests/lib/Security/CertificateManagerTest.php
@@ -9,6 +9,7 @@
 namespace Test\Security;
 
 use OC\Files\Storage\Temporary;
+use OC\Files\View;
 use \OC\Security\CertificateManager;
 use OCP\IConfig;
 use OCP\ILogger;
@@ -152,7 +153,7 @@ class CertificateManagerTest extends \Test\TestCase {
 								$expected
 	) {
 
-		$view = $this->getMockBuilder('OC\Files\View')
+		$view = $this->getMockBuilder(View::class)
 			->disableOriginalConstructor()->getMock();
 		$config = $this->createMock(IConfig::class);
 
diff --git a/tests/lib/Session/CryptoWrappingTest.php b/tests/lib/Session/CryptoWrappingTest.php
index e1fadbf933..f34148fb50 100644
--- a/tests/lib/Session/CryptoWrappingTest.php
+++ b/tests/lib/Session/CryptoWrappingTest.php
@@ -22,6 +22,7 @@
 namespace Test\Session;
 
 use OC\Session\CryptoSessionData;
+use OCP\ISession;
 use Test\TestCase;
 
 class CryptoWrappingTest extends TestCase {
@@ -37,7 +38,7 @@ class CryptoWrappingTest extends TestCase {
 	protected function setUp() {
 		parent::setUp();
 
-		$this->wrappedSession = $this->getMockBuilder('OCP\ISession')
+		$this->wrappedSession = $this->getMockBuilder(ISession::class)
 			->disableOriginalConstructor()
 			->getMock();
 		$this->crypto = $this->getMockBuilder('OCP\Security\ICrypto')