test: Migrate CalDAV tests to PHPUnit10tests/noid/caldav-tests

Signed-off-by: Joas Schilling <coding@schilljs.com>

71 files changed, 829 insertions, 1117 deletions

diff --git a/apps/dav/tests/unit/AppInfo/ApplicationTest.php b/apps/dav/tests/unit/AppInfo/ApplicationTest.php
index f8ddd9bb821..336f487e0b8 100644
--- a/apps/dav/tests/unit/AppInfo/ApplicationTest.php
+++ b/apps/dav/tests/unit/AppInfo/ApplicationTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
diff --git a/apps/dav/tests/unit/AppInfo/PluginManagerTest.php b/apps/dav/tests/unit/AppInfo/PluginManagerTest.php
index 7a60888a838..0082aa45286 100644
--- a/apps/dav/tests/unit/AppInfo/PluginManagerTest.php
+++ b/apps/dav/tests/unit/AppInfo/PluginManagerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 ownCloud GmbH.
  * SPDX-License-Identifier: AGPL-3.0-only
diff --git a/apps/dav/tests/unit/Avatars/AvatarHomeTest.php b/apps/dav/tests/unit/Avatars/AvatarHomeTest.php
index 9699c146c8a..c0c19192ba9 100644
--- a/apps/dav/tests/unit/Avatars/AvatarHomeTest.php
+++ b/apps/dav/tests/unit/Avatars/AvatarHomeTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2017 ownCloud GmbH
@@ -11,17 +12,14 @@ use OCA\DAV\Avatars\AvatarHome;
 use OCA\DAV\Avatars\AvatarNode;
 use OCP\IAvatar;
 use OCP\IAvatarManager;
+use PHPUnit\Framework\MockObject\MockObject;
 use Sabre\DAV\Exception\MethodNotAllowed;
 use Sabre\DAV\Exception\NotFound;
 use Test\TestCase;
 
 class AvatarHomeTest extends TestCase {
-
-	/** @var AvatarHome */
-	private $home;
-
-	/** @var IAvatarManager | \PHPUnit\Framework\MockObject\MockObject */
-	private $avatarManager;
+	private AvatarHome $home;
+	private IAvatarManager&MockObject $avatarManager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -38,7 +36,7 @@ class AvatarHomeTest extends TestCase {
 		$this->home->$method('');
 	}
 
-	public function providesForbiddenMethods() {
+	public static function providesForbiddenMethods(): array {
 		return [
 			['createFile'],
 			['createDirectory'],
@@ -52,7 +50,7 @@ class AvatarHomeTest extends TestCase {
 		self::assertEquals('admin', $n);
 	}
 
-	public function providesTestGetChild() {
+	public static function providesTestGetChild(): array {
 		return [
 			[MethodNotAllowed::class, false, ''],
 			[MethodNotAllowed::class, false, 'bla.foo'],
@@ -65,7 +63,7 @@ class AvatarHomeTest extends TestCase {
 	/**
 	 * @dataProvider providesTestGetChild
 	 */
-	public function testGetChild($expectedException, $hasAvatar, $path): void {
+	public function testGetChild(?string $expectedException, bool $hasAvatar, string $path): void {
 		if ($expectedException !== null) {
 			$this->expectException($expectedException);
 		}
@@ -92,7 +90,7 @@ class AvatarHomeTest extends TestCase {
 	/**
 	 * @dataProvider providesTestGetChild
 	 */
-	public function testChildExists($expectedException, $hasAvatar, $path): void {
+	public function testChildExists(?string $expectedException, bool $hasAvatar, string $path): void {
 		$avatar = $this->createMock(IAvatar::class);
 		$avatar->method('exists')->willReturn($hasAvatar);
 
diff --git a/apps/dav/tests/unit/Avatars/AvatarNodeTest.php b/apps/dav/tests/unit/Avatars/AvatarNodeTest.php
index 92c02e17ff8..01634e77ed6 100644
--- a/apps/dav/tests/unit/Avatars/AvatarNodeTest.php
+++ b/apps/dav/tests/unit/Avatars/AvatarNodeTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2017 ownCloud GmbH
@@ -9,18 +10,19 @@ namespace OCA\DAV\Tests\Unit\Avatars;
 
 use OCA\DAV\Avatars\AvatarNode;
 use OCP\IAvatar;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class AvatarNodeTest extends TestCase {
 	public function testGetName(): void {
-		/** @var IAvatar | \PHPUnit\Framework\MockObject\MockObject $a */
+		/** @var IAvatar&MockObject $a */
 		$a = $this->createMock(IAvatar::class);
 		$n = new AvatarNode(1024, 'png', $a);
 		$this->assertEquals('1024.png', $n->getName());
 	}
 
 	public function testGetContentType(): void {
-		/** @var IAvatar | \PHPUnit\Framework\MockObject\MockObject $a */
+		/** @var IAvatar&MockObject $a */
 		$a = $this->createMock(IAvatar::class);
 		$n = new AvatarNode(1024, 'png', $a);
 		$this->assertEquals('image/png', $n->getContentType());
diff --git a/apps/dav/tests/unit/BackgroundJob/CleanupInvitationTokenJobTest.php b/apps/dav/tests/unit/BackgroundJob/CleanupInvitationTokenJobTest.php
index 21e999d34be..b2199e3e657 100644
--- a/apps/dav/tests/unit/BackgroundJob/CleanupInvitationTokenJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/CleanupInvitationTokenJobTest.php
@@ -13,17 +13,13 @@ use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\DB\QueryBuilder\IExpressionBuilder;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class CleanupInvitationTokenJobTest extends TestCase {
-	/** @var IDBConnection | \PHPUnit\Framework\MockObject\MockObject */
-	private $dbConnection;
-
-	/** @var ITimeFactory | \PHPUnit\Framework\MockObject\MockObject */
-	private $timeFactory;
-
-	/** @var CleanupInvitationTokenJob */
-	private $backgroundJob;
+	private IDBConnection&MockObject $dbConnection;
+	private ITimeFactory&MockObject $timeFactory;
+	private CleanupInvitationTokenJob $backgroundJob;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/BackgroundJob/CleanupOrphanedChildrenJobTest.php b/apps/dav/tests/unit/BackgroundJob/CleanupOrphanedChildrenJobTest.php
index fe05616d609..2065b8fe946 100644
--- a/apps/dav/tests/unit/BackgroundJob/CleanupOrphanedChildrenJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/CleanupOrphanedChildrenJobTest.php
@@ -103,14 +103,13 @@ class CleanupOrphanedChildrenJobTest extends TestCase {
 		$deleteQb = $this->getMockQueryBuilder();
 		$result = $this->createMock(IResult::class);
 
-		$qbInvocationCount = self::exactly(2);
-		$this->connection->expects($qbInvocationCount)
-			->method('getQueryBuilder')
-			->willReturnCallback(function () use ($qbInvocationCount, $selectQb, $deleteQb) {
-				return match ($qbInvocationCount->getInvocationCount()) {
-					1 => $selectQb,
-					2 => $deleteQb,
-				};
+		$calls = [
+			$selectQb,
+			$deleteQb,
+		];
+		$this->connection->method('getQueryBuilder')
+			->willReturnCallback(function () use (&$calls) {
+				return array_shift($calls);
 			});
 		$selectQb->expects(self::once())
 			->method('executeQuery')
@@ -140,15 +139,15 @@ class CleanupOrphanedChildrenJobTest extends TestCase {
 		$deleteQb = $this->getMockQueryBuilder();
 		$result = $this->createMock(IResult::class);
 
-		$qbInvocationCount = self::exactly(2);
-		$this->connection->expects($qbInvocationCount)
-			->method('getQueryBuilder')
-			->willReturnCallback(function () use ($qbInvocationCount, $selectQb, $deleteQb) {
-				return match ($qbInvocationCount->getInvocationCount()) {
-					1 => $selectQb,
-					2 => $deleteQb,
-				};
+		$calls = [
+			$selectQb,
+			$deleteQb,
+		];
+		$this->connection->method('getQueryBuilder')
+			->willReturnCallback(function () use (&$calls) {
+				return array_shift($calls);
 			});
+
 		$selectQb->expects(self::once())
 			->method('executeQuery')
 			->willReturn($result);
diff --git a/apps/dav/tests/unit/BackgroundJob/EventReminderJobTest.php b/apps/dav/tests/unit/BackgroundJob/EventReminderJobTest.php
index 1173e516a22..1f70869f211 100644
--- a/apps/dav/tests/unit/BackgroundJob/EventReminderJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/EventReminderJobTest.php
@@ -16,17 +16,10 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class EventReminderJobTest extends TestCase {
-	/** @var ITimeFactory|MockObject */
-	private $time;
-
-	/** @var ReminderService|MockObject */
-	private $reminderService;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var EventReminderJob|MockObject */
-	private $backgroundJob;
+	private ITimeFactory&MockObject $time;
+	private ReminderService&MockObject $reminderService;
+	private IConfig&MockObject $config;
+	private EventReminderJob $backgroundJob;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -42,7 +35,7 @@ class EventReminderJobTest extends TestCase {
 		);
 	}
 
-	public function data(): array {
+	public static function data(): array {
 		return [
 			[true, true, true],
 			[true, false, false],
@@ -61,14 +54,10 @@ class EventReminderJobTest extends TestCase {
 	public function testRun(bool $sendEventReminders, bool $sendEventRemindersMode, bool $expectCall): void {
 		$this->config->expects($this->exactly($sendEventReminders ? 2 : 1))
 			->method('getAppValue')
-			->withConsecutive(
-				['dav', 'sendEventReminders', 'yes'],
-				['dav', 'sendEventRemindersMode', 'backgroundjob'],
-			)
-			->willReturnOnConsecutiveCalls(
-				$sendEventReminders ? 'yes' : 'no',
-				$sendEventRemindersMode ? 'backgroundjob' : 'cron'
-			);
+			->willReturnMap([
+				['dav', 'sendEventReminders', 'yes', ($sendEventReminders ? 'yes' : 'no')],
+				['dav', 'sendEventRemindersMode', 'backgroundjob', ($sendEventRemindersMode ? 'backgroundjob' : 'cron')],
+			]);
 
 		if ($expectCall) {
 			$this->reminderService->expects($this->once())
diff --git a/apps/dav/tests/unit/BackgroundJob/GenerateBirthdayCalendarBackgroundJobTest.php b/apps/dav/tests/unit/BackgroundJob/GenerateBirthdayCalendarBackgroundJobTest.php
index 82d2251f17a..88a76ae1332 100644
--- a/apps/dav/tests/unit/BackgroundJob/GenerateBirthdayCalendarBackgroundJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/GenerateBirthdayCalendarBackgroundJobTest.php
@@ -16,18 +16,10 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class GenerateBirthdayCalendarBackgroundJobTest extends TestCase {
-
-	/** @var ITimeFactory|MockObject */
-	private $time;
-
-	/** @var BirthdayService | MockObject */
-	private $birthdayService;
-
-	/** @var IConfig | MockObject */
-	private $config;
-
-	/** @var GenerateBirthdayCalendarBackgroundJob */
-	private $backgroundJob;
+	private ITimeFactory&MockObject $time;
+	private BirthdayService&MockObject $birthdayService;
+	private IConfig&MockObject $config;
+	private GenerateBirthdayCalendarBackgroundJob $backgroundJob;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php b/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php
index 5ddd9eba6f8..6135fd00fdc 100644
--- a/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php
@@ -25,21 +25,11 @@ use Test\TestCase;
 
 class OutOfOfficeEventDispatcherJobTest extends TestCase {
 	private OutOfOfficeEventDispatcherJob $job;
-
-	/** @var MockObject|ITimeFactory */
-	private $timeFactory;
-
-	/** @var MockObject|AbsenceMapper */
-	private $absenceMapper;
-
-	/** @var MockObject|LoggerInterface */
-	private $logger;
-
-	/** @var MockObject|IEventDispatcher */
-	private $eventDispatcher;
-
-	/** @var MockObject|IUserManager */
-	private $userManager;
+	private ITimeFactory&MockObject $timeFactory;
+	private AbsenceMapper&MockObject $absenceMapper;
+	private LoggerInterface&MockObject $logger;
+	private IEventDispatcher&MockObject $eventDispatcher;
+	private IUserManager&MockObject $userManager;
 	private MockObject|TimezoneService $timezoneService;
 
 	protected function setUp(): void {
diff --git a/apps/dav/tests/unit/BackgroundJob/PruneOutdatedSyncTokensJobTest.php b/apps/dav/tests/unit/BackgroundJob/PruneOutdatedSyncTokensJobTest.php
index d08d0fd4496..eb471189c24 100644
--- a/apps/dav/tests/unit/BackgroundJob/PruneOutdatedSyncTokensJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/PruneOutdatedSyncTokensJobTest.php
@@ -20,21 +20,11 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class PruneOutdatedSyncTokensJobTest extends TestCase {
-	/** @var ITimeFactory | MockObject */
-	private $timeFactory;
-
-	/** @var CalDavBackend | MockObject */
-	private $calDavBackend;
-
-	/** @var CardDavBackend | MockObject */
-	private $cardDavBackend;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var LoggerInterface|MockObject */
-	private $logger;
-
+	private ITimeFactory&MockObject $timeFactory;
+	private CalDavBackend&MockObject $calDavBackend;
+	private CardDavBackend&MockObject $cardDavBackend;
+	private IConfig&MockObject $config;
+	private LoggerInterface&MockObject $logger;
 	private PruneOutdatedSyncTokensJob $backgroundJob;
 
 	protected function setUp(): void {
@@ -84,7 +74,7 @@ class PruneOutdatedSyncTokensJobTest extends TestCase {
 		$this->backgroundJob->run(null);
 	}
 
-	public function dataForTestRun(): array {
+	public static function dataForTestRun(): array {
 		return [
 			['100', '2', 100, 7 * 24 * 3600, 2, 3],
 			['100', '14', 100, 14 * 24 * 3600, 2, 3],
diff --git a/apps/dav/tests/unit/BackgroundJob/RefreshWebcalJobTest.php b/apps/dav/tests/unit/BackgroundJob/RefreshWebcalJobTest.php
index 2b11223210e..0cdeb6436e2 100644
--- a/apps/dav/tests/unit/BackgroundJob/RefreshWebcalJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/RefreshWebcalJobTest.php
@@ -19,20 +19,11 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class RefreshWebcalJobTest extends TestCase {
-
-	/** @var RefreshWebcalService | MockObject */
-	private $refreshWebcalService;
-
-	/** @var IConfig | MockObject */
-	private $config;
-
+	private RefreshWebcalService&MockObject $refreshWebcalService;
+	private IConfig&MockObject $config;
 	private LoggerInterface $logger;
-
-	/** @var ITimeFactory | MockObject */
-	private $timeFactory;
-
-	/** @var IJobList | MockObject */
-	private $jobList;
+	private ITimeFactory&MockObject $timeFactory;
+	private IJobList&MockObject $jobList;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -97,10 +88,7 @@ class RefreshWebcalJobTest extends TestCase {
 		$backgroundJob->start($this->jobList);
 	}
 
-	/**
-	 * @return array
-	 */
-	public function runDataProvider():array {
+	public static function runDataProvider():array {
 		return [
 			[0, 100000, true],
 			[100000, 100000, false]
diff --git a/apps/dav/tests/unit/BackgroundJob/RegisterRegenerateBirthdayCalendarsTest.php b/apps/dav/tests/unit/BackgroundJob/RegisterRegenerateBirthdayCalendarsTest.php
index 88493d91d9b..6c9214d0268 100644
--- a/apps/dav/tests/unit/BackgroundJob/RegisterRegenerateBirthdayCalendarsTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/RegisterRegenerateBirthdayCalendarsTest.php
@@ -14,20 +14,14 @@ use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\BackgroundJob\IJobList;
 use OCP\IUser;
 use OCP\IUserManager;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class RegisterRegenerateBirthdayCalendarsTest extends TestCase {
-	/** @var ITimeFactory | \PHPUnit\Framework\MockObject\MockObject */
-	private $time;
-
-	/** @var IUserManager | \PHPUnit\Framework\MockObject\MockObject */
-	private $userManager;
-
-	/** @var IJobList | \PHPUnit\Framework\MockObject\MockObject */
-	private $jobList;
-
-	/** @var RegisterRegenerateBirthdayCalendars */
-	private $backgroundJob;
+	private ITimeFactory&MockObject $time;
+	private IUserManager&MockObject $userManager;
+	private IJobList&MockObject $jobList;
+	private RegisterRegenerateBirthdayCalendars $backgroundJob;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -59,22 +53,26 @@ class RegisterRegenerateBirthdayCalendarsTest extends TestCase {
 				$closure($user3);
 			});
 
+		$calls = [
+			'uid1',
+			'uid2',
+			'uid3',
+		];
 		$this->jobList->expects($this->exactly(3))
 			->method('add')
-			->withConsecutive(
-				[GenerateBirthdayCalendarBackgroundJob::class, [
-					'userId' => 'uid1',
-					'purgeBeforeGenerating' => true
-				]],
-				[GenerateBirthdayCalendarBackgroundJob::class, [
-					'userId' => 'uid2',
-					'purgeBeforeGenerating' => true
-				]],
-				[GenerateBirthdayCalendarBackgroundJob::class, [
-					'userId' => 'uid3',
-					'purgeBeforeGenerating' => true
-				]],
-			);
+			->willReturnCallback(function () use (&$calls): void {
+				$expected = array_shift($calls);
+				$this->assertEquals(
+					[
+						GenerateBirthdayCalendarBackgroundJob::class,
+						[
+							'userId' => $expected,
+							'purgeBeforeGenerating' => true
+						]
+					],
+					func_get_args()
+				);
+			});
 
 		$this->backgroundJob->run([]);
 	}
diff --git a/apps/dav/tests/unit/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJobTest.php b/apps/dav/tests/unit/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJobTest.php
index 18ee0c5c61d..38a981787cd 100644
--- a/apps/dav/tests/unit/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJobTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/UpdateCalendarResourcesRoomsBackgroundJobTest.php
@@ -18,15 +18,9 @@ use Test\TestCase;
 
 class UpdateCalendarResourcesRoomsBackgroundJobTest extends TestCase {
 	private UpdateCalendarResourcesRoomsBackgroundJob $backgroundJob;
-
-	/** @var ITimeFactory|MockObject */
-	private $time;
-
-	/** @var IResourceManager|MockObject */
-	private $resourceManager;
-
-	/** @var IRoomManager|MockObject */
-	private $roomManager;
+	private ITimeFactory&MockObject $time;
+	private IResourceManager&MockObject $resourceManager;
+	private IRoomManager&MockObject $roomManager;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/BackgroundJob/UserStatusAutomationTest.php b/apps/dav/tests/unit/BackgroundJob/UserStatusAutomationTest.php
index ce3871aa400..369242ad488 100644
--- a/apps/dav/tests/unit/BackgroundJob/UserStatusAutomationTest.php
+++ b/apps/dav/tests/unit/BackgroundJob/UserStatusAutomationTest.php
@@ -29,14 +29,13 @@ use Test\TestCase;
  * @group DB
  */
 class UserStatusAutomationTest extends TestCase {
-
-	protected MockObject|ITimeFactory $time;
-	protected MockObject|IJobList $jobList;
-	protected MockObject|LoggerInterface $logger;
-	protected MockObject|IManager $statusManager;
-	protected MockObject|IConfig $config;
-	private IAvailabilityCoordinator|MockObject $coordinator;
-	private IUserManager|MockObject $userManager;
+	protected ITimeFactory&MockObject $time;
+	protected IJobList&MockObject $jobList;
+	protected LoggerInterface&MockObject $logger;
+	protected IManager&MockObject $statusManager;
+	protected IConfig&MockObject $config;
+	private IAvailabilityCoordinator&MockObject $coordinator;
+	private IUserManager&MockObject $userManager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -76,11 +75,11 @@ class UserStatusAutomationTest extends TestCase {
 				$this->coordinator,
 				$this->userManager,
 			])
-			->setMethods($methods)
+			->onlyMethods($methods)
 			->getMock();
 	}
 
-	public function dataRun(): array {
+	public static function dataRun(): array {
 		return [
 			['20230217', '2023-02-24 10:49:36.613834', true],
 			['20230224', '2023-02-24 10:49:36.613834', true],
diff --git a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
index c1d8e8609b6..45937d86873 100644
--- a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
+++ b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackend.php
@@ -44,12 +44,12 @@ abstract class AbstractCalDavBackend extends TestCase {
 
 
 	protected CalDavBackend $backend;
-	protected Principal|MockObject $principal;
-	protected IUserManager|MockObject $userManager;
-	protected IGroupManager|MockObject $groupManager;
-	protected IEventDispatcher|MockObject $dispatcher;
-	private LoggerInterface|MockObject $logger;
-	private IConfig|MockObject $config;
+	protected Principal&MockObject $principal;
+	protected IUserManager&MockObject $userManager;
+	protected IGroupManager&MockObject $groupManager;
+	protected IEventDispatcher&MockObject $dispatcher;
+	private LoggerInterface&MockObject $logger;
+	private IConfig&MockObject $config;
 	private ISecureRandom $random;
 	protected SharingBackend $sharingBackend;
 	protected IDBConnection $db;
@@ -77,7 +77,7 @@ abstract class AbstractCalDavBackend extends TestCase {
 				$this->createMock(IConfig::class),
 				$this->createMock(IFactory::class)
 			])
-			->setMethods(['getPrincipalByPath', 'getGroupMembership', 'findByUri'])
+			->onlyMethods(['getPrincipalByPath', 'getGroupMembership', 'findByUri'])
 			->getMock();
 		$this->principal->expects($this->any())->method('getPrincipalByPath')
 			->willReturn([
@@ -143,7 +143,7 @@ abstract class AbstractCalDavBackend extends TestCase {
 		}
 	}
 
-	protected function createTestCalendar() {
+	protected function createTestCalendar(): int {
 		$this->dispatcher->expects(self::any())
 			->method('dispatchTyped');
 
@@ -160,9 +160,7 @@ abstract class AbstractCalDavBackend extends TestCase {
 		$this->assertEquals('#1C4587FF', $color);
 		$this->assertEquals('Example', $calendars[0]['uri']);
 		$this->assertEquals('Example', $calendars[0]['{DAV:}displayname']);
-		$calendarId = $calendars[0]['id'];
-
-		return $calendarId;
+		return (int)$calendars[0]['id'];
 	}
 
 	protected function createTestSubscription() {
diff --git a/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php b/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
index 6ace633b072..ebe989ad815 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/BackendTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -19,21 +21,11 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class BackendTest extends TestCase {
-
-	/** @var IManager|MockObject */
-	protected $activityManager;
-
-	/** @var IGroupManager|MockObject */
-	protected $groupManager;
-
-	/** @var IUserSession|MockObject */
-	protected $userSession;
-
-	/** @var IAppManager|MockObject */
-	protected $appManager;
-
-	/** @var IUserManager|MockObject */
-	protected $userManager;
+	protected IManager&MockObject $activityManager;
+	protected IGroupManager&MockObject $groupManager;
+	protected IUserSession&MockObject $userSession;
+	protected IAppManager&MockObject $appManager;
+	protected IUserManager&MockObject $userManager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -45,10 +37,9 @@ class BackendTest extends TestCase {
 	}
 
 	/**
-	 * @param array $methods
-	 * @return Backend|MockObject
+	 * @return Backend|(Backend&MockObject)
 	 */
-	protected function getBackend(array $methods = []) {
+	protected function getBackend(array $methods = []): Backend {
 		if (empty($methods)) {
 			return new Backend(
 				$this->activityManager,
@@ -71,7 +62,7 @@ class BackendTest extends TestCase {
 		}
 	}
 
-	public function dataCallTriggerCalendarActivity() {
+	public static function dataCallTriggerCalendarActivity(): array {
 		return [
 			['onCalendarAdd', [['data']], Calendar::SUBJECT_ADD, [['data'], [], []]],
 			['onCalendarUpdate', [['data'], ['shares'], ['changed-properties']], Calendar::SUBJECT_UPDATE, [['data'], ['shares'], ['changed-properties']]],
@@ -82,13 +73,8 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @dataProvider dataCallTriggerCalendarActivity
-	 *
-	 * @param string $method
-	 * @param array $payload
-	 * @param string $expectedSubject
-	 * @param array $expectedPayload
 	 */
-	public function testCallTriggerCalendarActivity($method, array $payload, $expectedSubject, array $expectedPayload): void {
+	public function testCallTriggerCalendarActivity(string $method, array $payload, string $expectedSubject, array $expectedPayload): void {
 		$backend = $this->getBackend(['triggerCalendarActivity']);
 		$backend->expects($this->once())
 			->method('triggerCalendarActivity')
@@ -101,7 +87,7 @@ class BackendTest extends TestCase {
 		call_user_func_array([$backend, $method], $payload);
 	}
 
-	public function dataTriggerCalendarActivity() {
+	public static function dataTriggerCalendarActivity(): array {
 		return [
 			// Add calendar
 			[Calendar::SUBJECT_ADD, [], [], [], '', '', null, []],
@@ -184,16 +170,8 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @dataProvider dataTriggerCalendarActivity
-	 * @param string $action
-	 * @param array $data
-	 * @param array $shares
-	 * @param array $changedProperties
-	 * @param string $currentUser
-	 * @param string $author
-	 * @param string[]|null $shareUsers
-	 * @param string[] $users
 	 */
-	public function testTriggerCalendarActivity($action, array $data, array $shares, array $changedProperties, $currentUser, $author, $shareUsers, array $users): void {
+	public function testTriggerCalendarActivity(string $action, array $data, array $shares, array $changedProperties, string $currentUser, string $author, ?array $shareUsers, array $users): void {
 		$backend = $this->getBackend(['getUsersForShares']);
 
 		if ($shareUsers === null) {
@@ -278,7 +256,7 @@ class BackendTest extends TestCase {
 		], [], []]);
 	}
 
-	public function dataGetUsersForShares() {
+	public static function dataGetUsersForShares(): array {
 		return [
 			[
 				[],
@@ -323,9 +301,6 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGetUsersForShares
-	 * @param array $shares
-	 * @param array $groups
-	 * @param array $expected
 	 */
 	public function testGetUsersForShares(array $shares, array $groups, array $expected): void {
 		$backend = $this->getBackend();
@@ -356,7 +331,7 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @param string[] $users
-	 * @return IUser[]|MockObject[]
+	 * @return IUser[]&MockObject[]
 	 */
 	protected function getUsers(array $users) {
 		$list = [];
@@ -368,7 +343,7 @@ class BackendTest extends TestCase {
 
 	/**
 	 * @param string $uid
-	 * @return IUser|MockObject
+	 * @return IUser&MockObject
 	 */
 	protected function getUserMock($uid) {
 		$user = $this->createMock(IUser::class);
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Filter/CalendarTest.php b/apps/dav/tests/unit/CalDAV/Activity/Filter/CalendarTest.php
index a7c84260f21..a31907b4b0a 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Filter/CalendarTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Filter/CalendarTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -9,15 +11,12 @@ use OCA\DAV\CalDAV\Activity\Filter\Calendar;
 use OCP\Activity\IFilter;
 use OCP\IL10N;
 use OCP\IURLGenerator;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class CalendarTest extends TestCase {
-
-	/** @var IURLGenerator|\PHPUnit\Framework\MockObject\MockObject */
-	protected $url;
-
-	/** @var IFilter|\PHPUnit\Framework\MockObject\MockObject */
-	protected $filter;
+	protected IURLGenerator&MockObject $url;
+	protected IFilter $filter;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -48,7 +47,7 @@ class CalendarTest extends TestCase {
 		$this->assertEquals('absolute-path-to-icon', $this->filter->getIcon());
 	}
 
-	public function dataFilterTypes() {
+	public static function dataFilterTypes(): array {
 		return [
 			[[], []],
 			[['calendar', 'calendar_event'], ['calendar', 'calendar_event']],
@@ -62,7 +61,7 @@ class CalendarTest extends TestCase {
 	 * @param string[] $types
 	 * @param string[] $expected
 	 */
-	public function testFilterTypes($types, $expected): void {
+	public function testFilterTypes(array $types, array $expected): void {
 		$this->assertEquals($expected, $this->filter->filterTypes($types));
 	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Filter/GenericTest.php b/apps/dav/tests/unit/CalDAV/Activity/Filter/GenericTest.php
index 392759206ed..468dd15f480 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Filter/GenericTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Filter/GenericTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -15,7 +17,7 @@ use Test\TestCase;
  * @group DB
  */
 class GenericTest extends TestCase {
-	public function dataFilters() {
+	public static function dataFilters(): array {
 		return [
 			[Calendar::class],
 			[Todo::class],
@@ -24,18 +26,16 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testImplementsInterface($filterClass): void {
+	public function testImplementsInterface(string $filterClass): void {
 		$filter = Server::get($filterClass);
 		$this->assertInstanceOf(IFilter::class, $filter);
 	}
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testGetIdentifier($filterClass): void {
+	public function testGetIdentifier(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$this->assertIsString($filter->getIdentifier());
@@ -43,9 +43,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testGetName($filterClass): void {
+	public function testGetName(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$this->assertIsString($filter->getName());
@@ -53,9 +52,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testGetPriority($filterClass): void {
+	public function testGetPriority(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$priority = $filter->getPriority();
@@ -66,9 +64,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testGetIcon($filterClass): void {
+	public function testGetIcon(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$this->assertIsString($filter->getIcon());
@@ -77,9 +74,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testFilterTypes($filterClass): void {
+	public function testFilterTypes(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$this->assertIsArray($filter->filterTypes([]));
@@ -87,9 +83,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataFilters
-	 * @param string $filterClass
 	 */
-	public function testAllowedApps($filterClass): void {
+	public function testAllowedApps(string $filterClass): void {
 		/** @var IFilter $filter */
 		$filter = Server::get($filterClass);
 		$this->assertIsArray($filter->allowedApps());
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Filter/TodoTest.php b/apps/dav/tests/unit/CalDAV/Activity/Filter/TodoTest.php
index 6aa47f33750..6ef7289e156 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Filter/TodoTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Filter/TodoTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -9,15 +11,12 @@ use OCA\DAV\CalDAV\Activity\Filter\Todo;
 use OCP\Activity\IFilter;
 use OCP\IL10N;
 use OCP\IURLGenerator;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class TodoTest extends TestCase {
-
-	/** @var IURLGenerator|\PHPUnit\Framework\MockObject\MockObject */
-	protected $url;
-
-	/** @var IFilter|\PHPUnit\Framework\MockObject\MockObject */
-	protected $filter;
+	protected IURLGenerator&MockObject $url;
+	protected IFilter $filter;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -48,7 +47,7 @@ class TodoTest extends TestCase {
 		$this->assertEquals('absolute-path-to-icon', $this->filter->getIcon());
 	}
 
-	public function dataFilterTypes() {
+	public static function dataFilterTypes(): array {
 		return [
 			[[], []],
 			[['calendar_todo'], ['calendar_todo']],
@@ -62,7 +61,7 @@ class TodoTest extends TestCase {
 	 * @param string[] $types
 	 * @param string[] $expected
 	 */
-	public function testFilterTypes($types, $expected): void {
+	public function testFilterTypes(array $types, array $expected): void {
 		$this->assertEquals($expected, $this->filter->filterTypes($types));
 	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php b/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
index ba97c888b0c..113af7ed240 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Provider/BaseTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -7,7 +9,6 @@ namespace OCA\DAV\Tests\unit\CalDAV\Activity\Provider;
 
 use OCA\DAV\CalDAV\Activity\Provider\Base;
 use OCP\Activity\IEvent;
-use OCP\Activity\IProvider;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IURLGenerator;
@@ -16,17 +17,10 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class BaseTest extends TestCase {
-	/** @var IUserManager|MockObject */
-	protected $userManager;
-
-	/** @var IGroupManager|MockObject */
-	protected $groupManager;
-
-	/** @var IURLGenerator|MockObject */
-	protected $url;
-
-	/** @var IProvider|Base|MockObject */
-	protected $provider;
+	protected IUserManager&MockObject $userManager;
+	protected IGroupManager&MockObject $groupManager;
+	protected IURLGenerator&MockObject $url;
+	protected Base&MockObject $provider;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -39,24 +33,21 @@ class BaseTest extends TestCase {
 				$this->groupManager,
 				$this->url,
 			])
-			->setMethods(['parse'])
+			->onlyMethods(['parse'])
 			->getMock();
 	}
 
-	public function dataSetSubjects() {
+	public static function dataSetSubjects(): array {
 		return [
-			['abc', [], 'abc'],
-			['{actor} created {calendar}', ['actor' => ['name' => 'abc'], 'calendar' => ['name' => 'xyz']], 'abc created xyz'],
+			['abc', []],
+			['{actor} created {calendar}', ['actor' => ['name' => 'abc'], 'calendar' => ['name' => 'xyz']]],
 		];
 	}
 
 	/**
 	 * @dataProvider dataSetSubjects
-	 * @param string $subject
-	 * @param array $parameters
-	 * @param string $parsedSubject
 	 */
-	public function testSetSubjects(string $subject, array $parameters, string $parsedSubject): void {
+	public function testSetSubjects(string $subject, array $parameters): void {
 		$event = $this->createMock(IEvent::class);
 		$event->expects($this->once())
 			->method('setRichSubject')
@@ -68,7 +59,7 @@ class BaseTest extends TestCase {
 		$this->invokePrivate($this->provider, 'setSubjects', [$event, $subject, $parameters]);
 	}
 
-	public function dataGenerateCalendarParameter() {
+	public static function dataGenerateCalendarParameter(): array {
 		return [
 			[['id' => 23, 'uri' => 'foo', 'name' => 'bar'], 'bar'],
 			[['id' => 42, 'uri' => 'foo', 'name' => 'Personal'], 'Personal'],
@@ -79,8 +70,6 @@ class BaseTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGenerateCalendarParameter
-	 * @param array $data
-	 * @param string $name
 	 */
 	public function testGenerateCalendarParameter(array $data, string $name): void {
 		$l = $this->createMock(IL10N::class);
@@ -97,7 +86,7 @@ class BaseTest extends TestCase {
 		], $this->invokePrivate($this->provider, 'generateCalendarParameter', [$data, $l]));
 	}
 
-	public function dataGenerateLegacyCalendarParameter() {
+	public static function dataGenerateLegacyCalendarParameter(): array {
 		return [
 			[23, 'c1'],
 			[42, 'c2'],
@@ -106,8 +95,6 @@ class BaseTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGenerateLegacyCalendarParameter
-	 * @param int $id
-	 * @param string $name
 	 */
 	public function testGenerateLegacyCalendarParameter(int $id, string $name): void {
 		$this->assertEquals([
@@ -117,7 +104,7 @@ class BaseTest extends TestCase {
 		], $this->invokePrivate($this->provider, 'generateLegacyCalendarParameter', [$id, $name]));
 	}
 
-	public function dataGenerateGroupParameter() {
+	public static function dataGenerateGroupParameter(): array {
 		return [
 			['g1'],
 			['g2'],
@@ -126,7 +113,6 @@ class BaseTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGenerateGroupParameter
-	 * @param string $gid
 	 */
 	public function testGenerateGroupParameter(string $gid): void {
 		$this->assertEquals([
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php b/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php
index ec237825731..748360adf79 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Provider/EventTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -6,11 +8,9 @@
 namespace OCA\DAV\Tests\unit\CalDAV\Activity\Provider;
 
 use InvalidArgumentException;
-use OCA\DAV\CalDAV\Activity\Provider\Base;
 use OCA\DAV\CalDAV\Activity\Provider\Event;
 use OCP\Activity\IEventMerger;
 use OCP\Activity\IManager;
-use OCP\Activity\IProvider;
 use OCP\App\IAppManager;
 use OCP\IGroupManager;
 use OCP\IURLGenerator;
@@ -21,30 +21,14 @@ use Test\TestCase;
 use TypeError;
 
 class EventTest extends TestCase {
-
-	/** @var IUserManager|MockObject */
-	protected $userManager;
-
-	/** @var IGroupManager|MockObject */
-	protected $groupManager;
-
-	/** @var IURLGenerator|MockObject */
-	protected $url;
-
-	/** @var IProvider|Base|MockObject */
-	protected $provider;
-
-	/** @var IAppManager|MockObject */
-	protected $appManager;
-
-	/** @var IFactory|MockObject */
-	protected $i10nFactory;
-
-	/** @var IManager|MockObject */
-	protected $activityManager;
-
-	/** @var IEventMerger|MockObject */
-	protected $eventMerger;
+	protected IUserManager&MockObject $userManager;
+	protected IGroupManager&MockObject $groupManager;
+	protected IURLGenerator&MockObject $url;
+	protected IAppManager&MockObject $appManager;
+	protected IFactory&MockObject $i10nFactory;
+	protected IManager&MockObject $activityManager;
+	protected IEventMerger&MockObject $eventMerger;
+	protected Event&MockObject $provider;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -65,11 +49,11 @@ class EventTest extends TestCase {
 				$this->eventMerger,
 				$this->appManager
 			])
-			->setMethods(['parse'])
+			->onlyMethods(['parse'])
 			->getMock();
 	}
 
-	public function dataGenerateObjectParameter() {
+	public static function dataGenerateObjectParameter(): array {
 		$link = [
 			'object_uri' => 'someuuid.ics',
 			'calendar_uri' => 'personal',
@@ -85,10 +69,6 @@ class EventTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGenerateObjectParameter
-	 * @param int $id
-	 * @param string $name
-	 * @param array|null $link
-	 * @param bool $calendarAppEnabled
 	 */
 	public function testGenerateObjectParameter(int $id, string $name, ?array $link, bool $calendarAppEnabled = true): void {
 		$affectedUser = 'otheruser';
@@ -174,7 +154,9 @@ class EventTest extends TestCase {
 		];
 	}
 
-	/** @dataProvider generateObjectParameterLinkEncodingDataProvider */
+	/**
+	 * @dataProvider generateObjectParameterLinkEncodingDataProvider
+	 */
 	public function testGenerateObjectParameterLinkEncoding(array $link, string $objectId): void {
 		$generatedLink = [
 			'view' => 'dayGridMonth',
@@ -203,7 +185,7 @@ class EventTest extends TestCase {
 		$this->assertEquals($result, $this->invokePrivate($this->provider, 'generateObjectParameter', [$objectParameter, 'sharee']));
 	}
 
-	public function dataGenerateObjectParameterThrows() {
+	public static function dataGenerateObjectParameterThrows(): array {
 		return [
 			['event', TypeError::class],
 			[['name' => 'event']],
@@ -213,10 +195,8 @@ class EventTest extends TestCase {
 
 	/**
 	 * @dataProvider dataGenerateObjectParameterThrows
-	 * @param mixed $eventData
-	 * @param string $exception
 	 */
-	public function testGenerateObjectParameterThrows($eventData, string $exception = InvalidArgumentException::class): void {
+	public function testGenerateObjectParameterThrows(string|array $eventData, string $exception = InvalidArgumentException::class): void {
 		$this->expectException($exception);
 
 		$this->invokePrivate($this->provider, 'generateObjectParameter', [$eventData, 'no_user']);
diff --git a/apps/dav/tests/unit/CalDAV/Activity/Setting/GenericTest.php b/apps/dav/tests/unit/CalDAV/Activity/Setting/GenericTest.php
index 42b565b9d8b..2ed3bab02e6 100644
--- a/apps/dav/tests/unit/CalDAV/Activity/Setting/GenericTest.php
+++ b/apps/dav/tests/unit/CalDAV/Activity/Setting/GenericTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -13,7 +15,7 @@ use OCP\Server;
 use Test\TestCase;
 
 class GenericTest extends TestCase {
-	public function dataSettings() {
+	public static function dataSettings(): array {
 		return [
 			[Calendar::class],
 			[Event::class],
@@ -23,18 +25,16 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testImplementsInterface($settingClass): void {
+	public function testImplementsInterface(string $settingClass): void {
 		$setting = Server::get($settingClass);
 		$this->assertInstanceOf(ISetting::class, $setting);
 	}
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testGetIdentifier($settingClass): void {
+	public function testGetIdentifier(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsString($setting->getIdentifier());
@@ -42,9 +42,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testGetName($settingClass): void {
+	public function testGetName(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsString($setting->getName());
@@ -52,9 +51,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testGetPriority($settingClass): void {
+	public function testGetPriority(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$priority = $setting->getPriority();
@@ -65,9 +63,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testCanChangeStream($settingClass): void {
+	public function testCanChangeStream(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsBool($setting->canChangeStream());
@@ -75,9 +72,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testIsDefaultEnabledStream($settingClass): void {
+	public function testIsDefaultEnabledStream(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsBool($setting->isDefaultEnabledStream());
@@ -85,9 +81,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testCanChangeMail($settingClass): void {
+	public function testCanChangeMail(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsBool($setting->canChangeMail());
@@ -95,9 +90,8 @@ class GenericTest extends TestCase {
 
 	/**
 	 * @dataProvider dataSettings
-	 * @param string $settingClass
 	 */
-	public function testIsDefaultEnabledMail($settingClass): void {
+	public function testIsDefaultEnabledMail(string $settingClass): void {
 		/** @var ISetting $setting */
 		$setting = Server::get($settingClass);
 		$this->assertIsBool($setting->isDefaultEnabledMail());
diff --git a/apps/dav/tests/unit/CalDAV/AppCalendar/AppCalendarTest.php b/apps/dav/tests/unit/CalDAV/AppCalendar/AppCalendarTest.php
index f7fa114ff28..bac2094f734 100644
--- a/apps/dav/tests/unit/CalDAV/AppCalendar/AppCalendarTest.php
+++ b/apps/dav/tests/unit/CalDAV/AppCalendar/AppCalendarTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -16,13 +17,13 @@ use Test\TestCase;
 use function rewind;
 
 class AppCalendarTest extends TestCase {
-	private $principal = 'principals/users/foo';
+	private string $principal = 'principals/users/foo';
 
 	private AppCalendar $appCalendar;
 	private AppCalendar $writeableAppCalendar;
 
-	private ICalendar|MockObject $calendar;
-	private ICalendar|MockObject $writeableCalendar;
+	private ICalendar&MockObject $calendar;
+	private ICalendar&MockObject $writeableCalendar;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -53,9 +54,17 @@ class AppCalendarTest extends TestCase {
 	}
 
 	public function testCreateFile(): void {
+		$calls = [
+			['some-name', 'data'],
+			['other-name', ''],
+			['name', 'some data'],
+		];
 		$this->writeableCalendar->expects($this->exactly(3))
 			->method('createFromString')
-			->withConsecutive(['some-name', 'data'], ['other-name', ''], ['name', 'some data']);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+			});
 
 		// pass data
 		$this->assertNull($this->writeableAppCalendar->createFile('some-name', 'data'));
diff --git a/apps/dav/tests/unit/CalDAV/AppCalendar/CalendarObjectTest.php b/apps/dav/tests/unit/CalDAV/AppCalendar/CalendarObjectTest.php
index a913c2dde6f..3d72d5c97b8 100644
--- a/apps/dav/tests/unit/CalDAV/AppCalendar/CalendarObjectTest.php
+++ b/apps/dav/tests/unit/CalDAV/AppCalendar/CalendarObjectTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -17,9 +18,9 @@ use Test\TestCase;
 
 class CalendarObjectTest extends TestCase {
 	private CalendarObject $calendarObject;
-	private AppCalendar|MockObject $calendar;
-	private ICalendar|MockObject $backend;
-	private VCalendar|MockObject $vobject;
+	private AppCalendar&MockObject $calendar;
+	private ICalendar&MockObject $backend;
+	private VCalendar&MockObject $vobject;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/BirthdayCalendar/EnablePluginTest.php b/apps/dav/tests/unit/CalDAV/BirthdayCalendar/EnablePluginTest.php
index e60efc6fb19..a5811271ce2 100644
--- a/apps/dav/tests/unit/CalDAV/BirthdayCalendar/EnablePluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/BirthdayCalendar/EnablePluginTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -11,24 +13,15 @@ use OCA\DAV\CalDAV\Calendar;
 use OCA\DAV\CalDAV\CalendarHome;
 use OCP\IConfig;
 use OCP\IUser;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class EnablePluginTest extends TestCase {
-
-	/** @var \Sabre\DAV\Server|\PHPUnit\Framework\MockObject\MockObject */
-	protected $server;
-
-	/** @var IConfig|\PHPUnit\Framework\MockObject\MockObject */
-	protected $config;
-
-	/** @var BirthdayService |\PHPUnit\Framework\MockObject\MockObject */
-	protected $birthdayService;
-
-	/** @var IUser|\PHPUnit\Framework\MockObject\MockObject */
-	protected $user;
-
-	/** @var EnablePlugin $plugin */
-	protected $plugin;
+	protected \Sabre\DAV\Server&MockObject $server;
+	protected IConfig&MockObject $config;
+	protected BirthdayService&MockObject $birthdayService;
+	protected IUser&MockObject $user;
+	protected EnablePlugin $plugin;
 
 	protected $request;
 
diff --git a/apps/dav/tests/unit/CalDAV/CachedSubscriptionImplTest.php b/apps/dav/tests/unit/CalDAV/CachedSubscriptionImplTest.php
index 2378a75a7d5..935d8314f29 100644
--- a/apps/dav/tests/unit/CalDAV/CachedSubscriptionImplTest.php
+++ b/apps/dav/tests/unit/CalDAV/CachedSubscriptionImplTest.php
@@ -12,13 +12,14 @@ namespace OCA\DAV\Tests\unit\CalDAV;
 use OCA\DAV\CalDAV\CachedSubscription;
 use OCA\DAV\CalDAV\CachedSubscriptionImpl;
 use OCA\DAV\CalDAV\CalDavBackend;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class CachedSubscriptionImplTest extends TestCase {
-	private CachedSubscription $cachedSubscription;
+	private CachedSubscription&MockObject $cachedSubscription;
 	private array $cachedSubscriptionInfo;
+	private CalDavBackend&MockObject $backend;
 	private CachedSubscriptionImpl $cachedSubscriptionImpl;
-	private CalDavBackend $backend;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/CachedSubscriptionObjectTest.php b/apps/dav/tests/unit/CalDAV/CachedSubscriptionObjectTest.php
index 56e4930d3b3..03a2c9f20ee 100644
--- a/apps/dav/tests/unit/CalDAV/CachedSubscriptionObjectTest.php
+++ b/apps/dav/tests/unit/CalDAV/CachedSubscriptionObjectTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -32,7 +34,7 @@ class CachedSubscriptionObjectTest extends \Test\TestCase {
 		$this->assertEquals('BEGIN...', $calendarObject->get());
 	}
 
-	
+
 	public function testPut(): void {
 		$this->expectException(\Sabre\DAV\Exception\MethodNotAllowed::class);
 		$this->expectExceptionMessage('Creating objects in a cached subscription is not allowed');
@@ -52,7 +54,7 @@ class CachedSubscriptionObjectTest extends \Test\TestCase {
 		$calendarObject->put('');
 	}
 
-	
+
 	public function testDelete(): void {
 		$this->expectException(\Sabre\DAV\Exception\MethodNotAllowed::class);
 		$this->expectExceptionMessage('Deleting objects in a cached subscription is not allowed');
diff --git a/apps/dav/tests/unit/CalDAV/CachedSubscriptionProviderTest.php b/apps/dav/tests/unit/CalDAV/CachedSubscriptionProviderTest.php
index be47b2bf640..58d5ca7835c 100644
--- a/apps/dav/tests/unit/CalDAV/CachedSubscriptionProviderTest.php
+++ b/apps/dav/tests/unit/CalDAV/CachedSubscriptionProviderTest.php
@@ -12,11 +12,12 @@ namespace OCA\DAV\Tests\unit\CalDAV;
 use OCA\DAV\CalDAV\CachedSubscriptionImpl;
 use OCA\DAV\CalDAV\CachedSubscriptionProvider;
 use OCA\DAV\CalDAV\CalDavBackend;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class CachedSubscriptionProviderTest extends TestCase {
 
-	private CalDavBackend $backend;
+	private CalDavBackend&MockObject $backend;
 	private CachedSubscriptionProvider $provider;
 
 	protected function setUp(): void {
diff --git a/apps/dav/tests/unit/CalDAV/CachedSubscriptionTest.php b/apps/dav/tests/unit/CalDAV/CachedSubscriptionTest.php
index e1d22bc3e7b..091ee7a341f 100644
--- a/apps/dav/tests/unit/CalDAV/CachedSubscriptionTest.php
+++ b/apps/dav/tests/unit/CalDAV/CachedSubscriptionTest.php
@@ -140,19 +140,21 @@ class CachedSubscriptionTest extends \Test\TestCase {
 			'uri' => 'cal',
 		];
 
+		$calls = [
+			[666, 'foo1', 1, [
+				'id' => 99,
+				'uri' => 'foo1'
+			]],
+			[666, 'foo2', 1, null],
+		];
 		$backend->expects($this->exactly(2))
 			->method('getCalendarObject')
-			->withConsecutive(
-				[666, 'foo1', 1],
-				[666, 'foo2', 1],
-			)
-			->willReturnOnConsecutiveCalls(
-				[
-					'id' => 99,
-					'uri' => 'foo1'
-				],
-				null
-			);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$return = array_pop($expected);
+				$this->assertEquals($expected, func_get_args());
+				return $return;
+			});
 
 		$calendar = new CachedSubscription($backend, $calendarInfo);
 
@@ -250,19 +252,21 @@ class CachedSubscriptionTest extends \Test\TestCase {
 			'uri' => 'cal',
 		];
 
+		$calls = [
+			[666, 'foo1', 1, [
+				'id' => 99,
+				'uri' => 'foo1'
+			]],
+			[666, 'foo2', 1, null],
+		];
 		$backend->expects($this->exactly(2))
 			->method('getCalendarObject')
-			->withConsecutive(
-				[666, 'foo1', 1],
-				[666, 'foo2', 1],
-			)
-			->willReturnOnConsecutiveCalls(
-				[
-					'id' => 99,
-					'uri' => 'foo1'
-				],
-				null
-			);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$return = array_pop($expected);
+				$this->assertEquals($expected, func_get_args());
+				return $return;
+			});
 
 		$calendar = new CachedSubscription($backend, $calendarInfo);
 
diff --git a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
index 825d798e7e1..f8368660626 100644
--- a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -28,8 +30,6 @@ use function time;
  * Class CalDavBackendTest
  *
  * @group DB
- *
- * @package OCA\DAV\Tests\unit\CalDAV
  */
 class CalDavBackendTest extends AbstractCalDavBackend {
 	public function testCalendarOperations(): void {
@@ -59,7 +59,7 @@ class CalDavBackendTest extends AbstractCalDavBackend {
 		self::assertEmpty($calendars);
 	}
 
-	public function providesSharingData() {
+	public static function providesSharingData(): array {
 		return [
 			[true, true, true, false, [
 				[
@@ -458,7 +458,7 @@ EOD;
 		$this->assertNotNull($co);
 	}
 
-	public function providesCalendarQueryParameters() {
+	public static function providesCalendarQueryParameters(): array {
 		return [
 			'all' => [[0, 1, 2, 3], [], []],
 			'only-todos' => [[], ['name' => 'VTODO'], []],
@@ -619,7 +619,7 @@ EOD;
 		$this->assertCount(0, $subscriptions);
 	}
 
-	public function providesSchedulingData() {
+	public static function providesSchedulingData(): array {
 		$data = <<<EOS
 BEGIN:VCALENDAR
 VERSION:2.0
@@ -725,7 +725,7 @@ EOS;
 		}
 	}
 
-	public function providesCalDataForGetDenormalizedData(): array {
+	public static function providesCalDataForGetDenormalizedData(): array {
 		return [
 			'first occurrence before unix epoch starts' => [0, 'firstOccurence', "BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nCALSCALE:GREGORIAN\r\nBEGIN:VEVENT\r\nUID:413F269B-B51B-46B1-AFB6-40055C53A4DC\r\nDTSTAMP:20160309T095056Z\r\nDTSTART;VALUE=DATE:16040222\r\nDTEND;VALUE=DATE:16040223\r\nRRULE:FREQ=YEARLY\r\nSUMMARY:SUMMARY\r\nTRANSP:TRANSPARENT\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n"],
 			'no first occurrence because yearly' => [null, 'firstOccurence', "BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nCALSCALE:GREGORIAN\r\nBEGIN:VEVENT\r\nUID:413F269B-B51B-46B1-AFB6-40055C53A4DC\r\nDTSTAMP:20160309T095056Z\r\nRRULE:FREQ=YEARLY\r\nSUMMARY:SUMMARY\r\nTRANSP:TRANSPARENT\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n"],
@@ -980,7 +980,7 @@ EOD;
 		$this->assertCount($count, $result);
 	}
 
-	public function searchDataProvider() {
+	public static function searchDataProvider(): array {
 		return [
 			[false, [], 4],
 			[true, ['timerange' => ['start' => new DateTime('2013-09-12 13:00:00'), 'end' => new DateTime('2013-09-12 14:00:00')]], 2],
diff --git a/apps/dav/tests/unit/CalDAV/CalendarHomeTest.php b/apps/dav/tests/unit/CalDAV/CalendarHomeTest.php
index 9956c17fff3..e25cc099bd6 100644
--- a/apps/dav/tests/unit/CalDAV/CalendarHomeTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalendarHomeTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -22,21 +24,11 @@ use Sabre\DAV\MkCol;
 use Test\TestCase;
 
 class CalendarHomeTest extends TestCase {
-
-	/** @var CalDavBackend | MockObject */
-	private $backend;
-
-	/** @var array */
-	private $principalInfo = [];
-
-	/** @var PluginManager */
-	private $pluginManager;
-
-	/** @var CalendarHome */
-	private $calendarHome;
-
-	/** @var MockObject|LoggerInterface */
-	private $logger;
+	private CalDavBackend&MockObject $backend;
+	private array $principalInfo = [];
+	private PluginManager&MockObject $pluginManager;
+	private LoggerInterface&MockObject $logger;
+	private CalendarHome $calendarHome;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -62,7 +54,7 @@ class CalendarHomeTest extends TestCase {
 	}
 
 	public function testCreateCalendarValidName(): void {
-		/** @var MkCol | MockObject $mkCol */
+		/** @var MkCol&MockObject $mkCol */
 		$mkCol = $this->createMock(MkCol::class);
 
 		$mkCol->method('getResourceType')
@@ -82,7 +74,7 @@ class CalendarHomeTest extends TestCase {
 		$this->expectException(\Sabre\DAV\Exception\MethodNotAllowed::class);
 		$this->expectExceptionMessage('The resource you tried to create has a reserved name');
 
-		/** @var MkCol | MockObject $mkCol */
+		/** @var MkCol&MockObject $mkCol */
 		$mkCol = $this->createMock(MkCol::class);
 
 		$this->calendarHome->createExtendedCollection('contact_birthdays', $mkCol);
@@ -92,7 +84,7 @@ class CalendarHomeTest extends TestCase {
 		$this->expectException(\Sabre\DAV\Exception\MethodNotAllowed::class);
 		$this->expectExceptionMessage('The resource you tried to create has a reserved name');
 
-		/** @var MkCol | MockObject $mkCol */
+		/** @var MkCol&MockObject $mkCol */
 		$mkCol = $this->createMock(MkCol::class);
 
 		$this->calendarHome->createExtendedCollection('app-generated--example--foo-1', $mkCol);
diff --git a/apps/dav/tests/unit/CalDAV/CalendarImplTest.php b/apps/dav/tests/unit/CalDAV/CalendarImplTest.php
index 0d5223739f3..88b04326cc9 100644
--- a/apps/dav/tests/unit/CalDAV/CalendarImplTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalendarImplTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -21,11 +23,10 @@ use Sabre\VObject\ITip\Message;
 use Sabre\VObject\Reader;
 
 class CalendarImplTest extends \Test\TestCase {
-
-	private Calendar|MockObject $calendar;
+	private Calendar&MockObject $calendar;
 	private array $calendarInfo;
-	private CalDavBackend|MockObject $backend;
-	private CalendarImpl|MockObject $calendarImpl;
+	private CalDavBackend&MockObject $backend;
+	private CalendarImpl $calendarImpl;
 	private array $mockExportCollection;
 
 	protected function setUp(): void {
@@ -299,7 +300,7 @@ EOF;
 		foreach ($this->calendarImpl->export(null) as $entry) {
 			$exported[] = $entry;
 		}
-		
+
 		// Assert
 		$this->assertCount(1, $exported, 'Invalid exported items count');
 	}
diff --git a/apps/dav/tests/unit/CalDAV/CalendarManagerTest.php b/apps/dav/tests/unit/CalDAV/CalendarManagerTest.php
index 63d92dff40d..e8159ffe07c 100644
--- a/apps/dav/tests/unit/CalDAV/CalendarManagerTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalendarManagerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -16,20 +18,11 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 
 class CalendarManagerTest extends \Test\TestCase {
-	/** @var CalDavBackend | MockObject */
-	private $backend;
-
-	/** @var IL10N | MockObject */
-	private $l10n;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var CalendarManager */
-	private $manager;
-
-	/** @var MockObject|LoggerInterface */
-	private $logger;
+	private CalDavBackend&MockObject $backend;
+	private IL10N&MockObject $l10n;
+	private IConfig&MockObject $config;
+	private LoggerInterface&MockObject $logger;
+	private CalendarManager $manager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -54,7 +47,7 @@ class CalendarManagerTest extends \Test\TestCase {
 				['id' => 456, 'uri' => 'blablub2'],
 			]);
 
-		/** @var IManager | MockObject $calendarManager */
+		/** @var IManager&MockObject $calendarManager */
 		$calendarManager = $this->createMock(Manager::class);
 		$registeredIds = [];
 		$calendarManager->expects($this->exactly(2))
diff --git a/apps/dav/tests/unit/CalDAV/CalendarTest.php b/apps/dav/tests/unit/CalDAV/CalendarTest.php
index 7f2d0052162..0eff72c5c3d 100644
--- a/apps/dav/tests/unit/CalDAV/CalendarTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalendarTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -18,20 +20,13 @@ use Sabre\VObject\Reader;
 use Test\TestCase;
 
 class CalendarTest extends TestCase {
-
-	/** @var IL10N */
-	protected $l10n;
-
-	/** @var IConfig */
-	protected $config;
-
-	/** @var MockObject|LoggerInterface */
-	protected $logger;
+	protected IL10N&MockObject $l10n;
+	protected IConfig&MockObject $config;
+	protected LoggerInterface&MockObject $logger;
 
 	protected function setUp(): void {
 		parent::setUp();
-		$this->l10n = $this->getMockBuilder(IL10N::class)
-			->disableOriginalConstructor()->getMock();
+		$this->l10n = $this->createMock(IL10N::class);
 		$this->config = $this->createMock(IConfig::class);
 		$this->logger = $this->createMock(LoggerInterface::class);
 		$this->l10n
@@ -80,7 +75,7 @@ class CalendarTest extends TestCase {
 	}
 
 	public function testDeleteOwn(): void {
-		/** @var MockObject | CalDavBackend $backend */
+		/** @var CalDavBackend&MockObject $backend */
 		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->never())->method('updateShares');
 		$backend->expects($this->never())->method('getShares');
@@ -101,7 +96,7 @@ class CalendarTest extends TestCase {
 	}
 
 	public function testDeleteBirthdayCalendar(): void {
-		/** @var MockObject | CalDavBackend $backend */
+		/** @var CalDavBackend&MockObject $backend */
 		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->once())->method('deleteCalendar')
 			->with(666);
@@ -122,7 +117,7 @@ class CalendarTest extends TestCase {
 		$c->delete();
 	}
 
-	public function dataPropPatch() {
+	public static function dataPropPatch(): array {
 		return [
 			['user1', 'user2', [], true],
 			['user1', 'user2', [
@@ -152,9 +147,9 @@ class CalendarTest extends TestCase {
 	/**
 	 * @dataProvider dataPropPatch
 	 */
-	public function testPropPatch($ownerPrincipal, $principalUri, $mutations, $shared): void {
-		/** @var MockObject | CalDavBackend $backend */
-		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
+	public function testPropPatch(string $ownerPrincipal, string $principalUri, array $mutations, bool $shared): void {
+		/** @var CalDavBackend&MockObject $backend */
+		$backend = $this->createMock(CalDavBackend::class);
 		$calendarInfo = [
 			'{http://owncloud.org/ns}owner-principal' => $ownerPrincipal,
 			'principaluri' => $principalUri,
@@ -177,8 +172,8 @@ class CalendarTest extends TestCase {
 	 * @dataProvider providesReadOnlyInfo
 	 */
 	public function testAcl($expectsWrite, $readOnlyValue, $hasOwnerSet, $uri = 'default'): void {
-		/** @var MockObject | CalDavBackend $backend */
-		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
+		/** @var CalDavBackend&MockObject $backend */
+		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->any())->method('applyShareAcl')->willReturnArgument(1);
 		$calendarInfo = [
 			'principaluri' => 'user2',
@@ -263,7 +258,7 @@ class CalendarTest extends TestCase {
 		$this->assertEquals($expectedAcl, $childAcl);
 	}
 
-	public function providesReadOnlyInfo() {
+	public static function providesReadOnlyInfo(): array {
 		return [
 			'read-only property not set' => [true, null, true],
 			'read-only property is false' => [true, false, true],
@@ -277,16 +272,14 @@ class CalendarTest extends TestCase {
 
 	/**
 	 * @dataProvider providesConfidentialClassificationData
-	 * @param int $expectedChildren
-	 * @param bool $isShared
 	 */
-	public function testPrivateClassification($expectedChildren, $isShared): void {
+	public function testPrivateClassification(int $expectedChildren, bool $isShared): void {
 		$calObject0 = ['uri' => 'event-0', 'classification' => CalDavBackend::CLASSIFICATION_PUBLIC];
 		$calObject1 = ['uri' => 'event-1', 'classification' => CalDavBackend::CLASSIFICATION_CONFIDENTIAL];
 		$calObject2 = ['uri' => 'event-2', 'classification' => CalDavBackend::CLASSIFICATION_PRIVATE];
 
-		/** @var MockObject | CalDavBackend $backend */
-		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
+		/** @var CalDavBackend&MockObject $backend */
+		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->any())->method('getCalendarObjects')->willReturn([
 			$calObject0, $calObject1, $calObject2
 		]);
@@ -319,10 +312,8 @@ class CalendarTest extends TestCase {
 
 	/**
 	 * @dataProvider providesConfidentialClassificationData
-	 * @param int $expectedChildren
-	 * @param bool $isShared
 	 */
-	public function testConfidentialClassification($expectedChildren, $isShared): void {
+	public function testConfidentialClassification(int $expectedChildren, bool $isShared): void {
 		$start = '20160609';
 		$end = '20160610';
 
@@ -372,8 +363,8 @@ EOD;
 		$calObject1 = ['uri' => 'event-1', 'classification' => CalDavBackend::CLASSIFICATION_CONFIDENTIAL, 'calendardata' => $calData];
 		$calObject2 = ['uri' => 'event-2', 'classification' => CalDavBackend::CLASSIFICATION_PRIVATE];
 
-		/** @var MockObject | CalDavBackend $backend */
-		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
+		/** @var CalDavBackend&MockObject $backend */
+		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->any())->method('getCalendarObjects')->willReturn([
 			$calObject0, $calObject1, $calObject2
 		]);
@@ -437,7 +428,7 @@ EOD;
 		}
 	}
 
-	public function providesConfidentialClassificationData() {
+	public static function providesConfidentialClassificationData(): array {
 		return [
 			[3, false],
 			[2, true]
@@ -540,7 +531,7 @@ EOD;
 			'classification' => CalDavBackend::CLASSIFICATION_CONFIDENTIAL,
 			'calendardata' => $confidentialObjectData];
 
-		/** @var MockObject | CalDavBackend $backend */
+		/** @var CalDavBackend&MockObject $backend */
 		$backend = $this->createMock(CalDavBackend::class);
 		$backend->expects($this->any())
 			->method('getCalendarObjects')
@@ -619,7 +610,7 @@ EOD;
 			$this->fixLinebreak($confidentialObjectCleaned));
 	}
 
-	private function fixLinebreak($str) {
+	private function fixLinebreak(string $str): string {
 		return preg_replace('~(*BSR_ANYCRLF)\R~', "\r\n", $str);
 	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/EventComparisonServiceTest.php b/apps/dav/tests/unit/CalDAV/EventComparisonServiceTest.php
index 43a7180647f..90b6f9ec0db 100644
--- a/apps/dav/tests/unit/CalDAV/EventComparisonServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/EventComparisonServiceTest.php
@@ -14,8 +14,7 @@ use Sabre\VObject\Component\VCalendar;
 use Test\TestCase;
 
 class EventComparisonServiceTest extends TestCase {
-	/** @var EventComparisonService */
-	private $eventComparisonService;
+	private EventComparisonService $eventComparisonService;
 
 	protected function setUp(): void {
 		$this->eventComparisonService = new EventComparisonService();
diff --git a/apps/dav/tests/unit/CalDAV/Export/ExportServiceTest.php b/apps/dav/tests/unit/CalDAV/Export/ExportServiceTest.php
index f1e049c4a80..838dfc18f2f 100644
--- a/apps/dav/tests/unit/CalDAV/Export/ExportServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Export/ExportServiceTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -14,10 +16,9 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Sabre\VObject\Component\VCalendar;
 
 class ExportServiceTest extends \Test\TestCase {
-
-	private ServerVersion|MockObject $serverVersion;
+	private ServerVersion&MockObject $serverVersion;
 	private ExportService $service;
-	private ICalendarExport|MockObject $calendar;
+	private ICalendarExport&MockObject $calendar;
 	private array $mockExportCollection;
 
 	protected function setUp(): void {
@@ -36,7 +37,7 @@ class ExportServiceTest extends \Test\TestCase {
 			yield $entry;
 		}
 	}
-	
+
 	public function testExport(): void {
 		// Arrange
 		// construct calendar with a 1 hour event and same start/end time zones
diff --git a/apps/dav/tests/unit/CalDAV/Integration/ExternalCalendarTest.php b/apps/dav/tests/unit/CalDAV/Integration/ExternalCalendarTest.php
index 778df5697f0..67b2ff3555a 100644
--- a/apps/dav/tests/unit/CalDAV/Integration/ExternalCalendarTest.php
+++ b/apps/dav/tests/unit/CalDAV/Integration/ExternalCalendarTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -6,10 +8,11 @@
 namespace OCA\DAV\Tests\unit\CalDAV\Integration;
 
 use OCA\DAV\CalDAV\Integration\ExternalCalendar;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class ExternalCalendarTest extends TestCase {
-	private $abstractExternalCalendar;
+	private ExternalCalendar&MockObject $abstractExternalCalendar;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -39,7 +42,7 @@ class ExternalCalendarTest extends TestCase {
 		$this->abstractExternalCalendar->setName('other-name');
 	}
 
-	public function createDirectory():void {
+	public function createDirectory(): void {
 		// Check that the method is final and can't be overridden by other classes
 		$reflectionMethod = new \ReflectionMethod(ExternalCalendar::class, 'createDirectory');
 		$this->assertTrue($reflectionMethod->isFinal());
@@ -73,7 +76,7 @@ class ExternalCalendarTest extends TestCase {
 		ExternalCalendar::splitAppGeneratedCalendarUri($name);
 	}
 
-	public function splitAppGeneratedCalendarUriDataProvider():array {
+	public static function splitAppGeneratedCalendarUriDataProvider():array {
 		return [
 			['personal'],
 			['foo_shared_by_admin'],
diff --git a/apps/dav/tests/unit/CalDAV/Listener/CalendarPublicationListenerTest.php b/apps/dav/tests/unit/CalDAV/Listener/CalendarPublicationListenerTest.php
index b55359cd208..3ba0b832593 100644
--- a/apps/dav/tests/unit/CalDAV/Listener/CalendarPublicationListenerTest.php
+++ b/apps/dav/tests/unit/CalDAV/Listener/CalendarPublicationListenerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -15,20 +17,11 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class CalendarPublicationListenerTest extends TestCase {
-
-	/** @var Backend|MockObject */
-	private $activityBackend;
-
-	/** @var LoggerInterface|MockObject */
-	private $logger;
-
+	private Backend&MockObject $activityBackend;
+	private LoggerInterface&MockObject $logger;
 	private CalendarPublicationListener $calendarPublicationListener;
-
-	/** @var CalendarPublishedEvent|MockObject */
-	private $publicationEvent;
-
-	/** @var CalendarUnpublishedEvent|MockObject */
-	private $unpublicationEvent;
+	private CalendarPublishedEvent&MockObject $publicationEvent;
+	private CalendarUnpublishedEvent&MockObject $unpublicationEvent;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/Listener/CalendarShareUpdateListenerTest.php b/apps/dav/tests/unit/CalDAV/Listener/CalendarShareUpdateListenerTest.php
index b8414ecd695..d5697a862db 100644
--- a/apps/dav/tests/unit/CalDAV/Listener/CalendarShareUpdateListenerTest.php
+++ b/apps/dav/tests/unit/CalDAV/Listener/CalendarShareUpdateListenerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -14,17 +16,10 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class CalendarShareUpdateListenerTest extends TestCase {
-
-	/** @var Backend|MockObject */
-	private $activityBackend;
-
-	/** @var LoggerInterface|MockObject */
-	private $logger;
-
+	private Backend&MockObject $activityBackend;
+	private LoggerInterface&MockObject $logger;
 	private CalendarShareUpdateListener $calendarPublicationListener;
-
-	/** @var CalendarShareUpdatedEvent|MockObject */
-	private $event;
+	private CalendarShareUpdatedEvent&MockObject $event;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/Listener/SubscriptionListenerTest.php b/apps/dav/tests/unit/CalDAV/Listener/SubscriptionListenerTest.php
index 589e659b9ea..cbfdfd6b9b7 100644
--- a/apps/dav/tests/unit/CalDAV/Listener/SubscriptionListenerTest.php
+++ b/apps/dav/tests/unit/CalDAV/Listener/SubscriptionListenerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -18,26 +20,13 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class SubscriptionListenerTest extends TestCase {
-
-	/** @var RefreshWebcalService|MockObject */
-	private $refreshWebcalService;
-
-	/** @var Backend|MockObject */
-	private $reminderBackend;
-
-	/** @var IJobList|MockObject */
-	private $jobList;
-
-	/** @var LoggerInterface|MockObject */
-	private $logger;
-
+	private RefreshWebcalService&MockObject $refreshWebcalService;
+	private Backend&MockObject $reminderBackend;
+	private IJobList&MockObject $jobList;
+	private LoggerInterface&MockObject $logger;
 	private SubscriptionListener $calendarPublicationListener;
-
-	/** @var SubscriptionCreatedEvent|MockObject */
-	private $subscriptionCreatedEvent;
-
-	/** @var SubscriptionDeletedEvent|MockObject */
-	private $subscriptionDeletedEvent;
+	private SubscriptionCreatedEvent&MockObject $subscriptionCreatedEvent;
+	private SubscriptionDeletedEvent&MockObject $subscriptionDeletedEvent;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/OutboxTest.php b/apps/dav/tests/unit/CalDAV/OutboxTest.php
index def2bd80157..cc0a3f0405f 100644
--- a/apps/dav/tests/unit/CalDAV/OutboxTest.php
+++ b/apps/dav/tests/unit/CalDAV/OutboxTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -7,15 +9,12 @@ namespace OCA\DAV\Tests\unit\CalDAV;
 
 use OCA\DAV\CalDAV\Outbox;
 use OCP\IConfig;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class OutboxTest extends TestCase {
-
-	/** @var IConfig */
-	private $config;
-
-	/** @var Outbox */
-	private $outbox;
+	private IConfig&MockObject $config;
+	private Outbox $outbox;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/PluginTest.php b/apps/dav/tests/unit/CalDAV/PluginTest.php
index 0915fdf2646..647e4b0da81 100644
--- a/apps/dav/tests/unit/CalDAV/PluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/PluginTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -9,8 +11,7 @@ use OCA\DAV\CalDAV\Plugin;
 use Test\TestCase;
 
 class PluginTest extends TestCase {
-	/** @var Plugin */
-	private $plugin;
+	private Plugin $plugin;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -18,7 +19,7 @@ class PluginTest extends TestCase {
 		$this->plugin = new Plugin();
 	}
 
-	public function linkProvider() {
+	public static function linkProvider(): array {
 		return [
 			[
 				'principals/users/MyUserName',
@@ -37,11 +38,8 @@ class PluginTest extends TestCase {
 
 	/**
 	 * @dataProvider linkProvider
-	 *
-	 * @param $input
-	 * @param $expected
 	 */
-	public function testGetCalendarHomeForPrincipal($input, $expected): void {
+	public function testGetCalendarHomeForPrincipal(string $input, string $expected): void {
 		$this->assertSame($expected, $this->plugin->getCalendarHomeForPrincipal($input));
 	}
 
diff --git a/apps/dav/tests/unit/CalDAV/PublicCalendarRootTest.php b/apps/dav/tests/unit/CalDAV/PublicCalendarRootTest.php
index 075681eff7f..6acceed6f64 100644
--- a/apps/dav/tests/unit/CalDAV/PublicCalendarRootTest.php
+++ b/apps/dav/tests/unit/CalDAV/PublicCalendarRootTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -18,6 +20,7 @@ use OCP\IL10N;
 use OCP\IUserManager;
 use OCP\Security\ISecureRandom;
 use OCP\Server;
+use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
@@ -30,25 +33,15 @@ use Test\TestCase;
  */
 class PublicCalendarRootTest extends TestCase {
 	public const UNIT_TEST_USER = '';
-	/** @var CalDavBackend */
-	private $backend;
-	/** @var PublicCalendarRoot */
-	private $publicCalendarRoot;
-	/** @var IL10N */
-	private $l10n;
-	/** @var Principal|\PHPUnit\Framework\MockObject\MockObject */
-	private $principal;
-	/** @var IUserManager|\PHPUnit\Framework\MockObject\MockObject */
-	protected $userManager;
-	/** @var IGroupManager|\PHPUnit\Framework\MockObject\MockObject */
-	protected $groupManager;
-	/** @var IConfig */
-	protected $config;
-
-	/** @var ISecureRandom */
-	private $random;
-	/** @var LoggerInterface */
-	private $logger;
+	private CalDavBackend $backend;
+	private PublicCalendarRoot $publicCalendarRoot;
+	private IL10N&MockObject $l10n;
+	private Principal&MockObject $principal;
+	protected IUserManager&MockObject $userManager;
+	protected IGroupManager&MockObject $groupManager;
+	protected IConfig&MockObject $config;
+	private ISecureRandom $random;
+	private LoggerInterface&MockObject $logger;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -82,8 +75,7 @@ class PublicCalendarRootTest extends TestCase {
 			$sharingBackend,
 			false,
 		);
-		$this->l10n = $this->getMockBuilder(IL10N::class)
-			->disableOriginalConstructor()->getMock();
+		$this->l10n = $this->createMock(IL10N::class);
 		$this->config = $this->createMock(IConfig::class);
 
 		$this->publicCalendarRoot = new PublicCalendarRoot($this->backend,
@@ -134,10 +126,7 @@ class PublicCalendarRootTest extends TestCase {
 		$this->assertSame([], $calendarResults);
 	}
 
-	/**
-	 * @return Calendar
-	 */
-	protected function createPublicCalendar() {
+	protected function createPublicCalendar(): Calendar {
 		$this->backend->createCalendar(self::UNIT_TEST_USER, 'Example', []);
 
 		$calendarInfo = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER)[0];
diff --git a/apps/dav/tests/unit/CalDAV/PublicCalendarTest.php b/apps/dav/tests/unit/CalDAV/PublicCalendarTest.php
index 0609892c279..7e8f714ef42 100644
--- a/apps/dav/tests/unit/CalDAV/PublicCalendarTest.php
+++ b/apps/dav/tests/unit/CalDAV/PublicCalendarTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -16,15 +18,13 @@ class PublicCalendarTest extends CalendarTest {
 
 	/**
 	 * @dataProvider providesConfidentialClassificationData
-	 * @param int $expectedChildren
-	 * @param bool $isShared
 	 */
-	public function testPrivateClassification($expectedChildren, $isShared): void {
+	public function testPrivateClassification(int $expectedChildren, bool $isShared): void {
 		$calObject0 = ['uri' => 'event-0', 'classification' => CalDavBackend::CLASSIFICATION_PUBLIC];
 		$calObject1 = ['uri' => 'event-1', 'classification' => CalDavBackend::CLASSIFICATION_CONFIDENTIAL];
 		$calObject2 = ['uri' => 'event-2', 'classification' => CalDavBackend::CLASSIFICATION_PRIVATE];
 
-		/** @var MockObject | CalDavBackend $backend */
+		/** @var CalDavBackend&MockObject $backend */
 		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
 		$backend->expects($this->any())->method('getCalendarObjects')->willReturn([
 			$calObject0, $calObject1, $calObject2
@@ -44,9 +44,9 @@ class PublicCalendarTest extends CalendarTest {
 			'id' => 666,
 			'uri' => 'cal',
 		];
-		/** @var MockObject | IConfig $config */
+		/** @var IConfig&MockObject $config */
 		$config = $this->createMock(IConfig::class);
-		/** @var MockObject | LoggerInterface $logger */
+		/** @var LoggerInterface&MockObject $logger */
 		$logger = $this->createMock(LoggerInterface::class);
 		$c = new PublicCalendar($backend, $calendarInfo, $this->l10n, $config, $logger);
 		$children = $c->getChildren();
@@ -59,10 +59,8 @@ class PublicCalendarTest extends CalendarTest {
 
 	/**
 	 * @dataProvider providesConfidentialClassificationData
-	 * @param int $expectedChildren
-	 * @param bool $isShared
 	 */
-	public function testConfidentialClassification($expectedChildren, $isShared): void {
+	public function testConfidentialClassification(int $expectedChildren, bool $isShared): void {
 		$start = '20160609';
 		$end = '20160610';
 
@@ -112,7 +110,7 @@ EOD;
 		$calObject1 = ['uri' => 'event-1', 'classification' => CalDavBackend::CLASSIFICATION_CONFIDENTIAL, 'calendardata' => $calData];
 		$calObject2 = ['uri' => 'event-2', 'classification' => CalDavBackend::CLASSIFICATION_PRIVATE];
 
-		/** @var MockObject | CalDavBackend $backend */
+		/** @var CalDavBackend&MockObject $backend */
 		$backend = $this->getMockBuilder(CalDavBackend::class)->disableOriginalConstructor()->getMock();
 		$backend->expects($this->any())->method('getCalendarObjects')->willReturn([
 			$calObject0, $calObject1, $calObject2
@@ -132,9 +130,9 @@ EOD;
 			'id' => 666,
 			'uri' => 'cal',
 		];
-		/** @var MockObject | IConfig $config */
+		/** @var IConfig&MockObject $config */
 		$config = $this->createMock(IConfig::class);
-		/** @var MockObject | LoggerInterface $logger */
+		/** @var LoggerInterface&MockObject $logger */
 		$logger = $this->createMock(LoggerInterface::class);
 		$c = new PublicCalendar($backend, $calendarInfo, $this->l10n, $config, $logger);
 
diff --git a/apps/dav/tests/unit/CalDAV/Publishing/PublisherTest.php b/apps/dav/tests/unit/CalDAV/Publishing/PublisherTest.php
index 769e1537646..5344ec5d7cd 100644
--- a/apps/dav/tests/unit/CalDAV/Publishing/PublisherTest.php
+++ b/apps/dav/tests/unit/CalDAV/Publishing/PublisherTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -43,9 +45,9 @@ class PublisherTest extends TestCase {
 	}
 
 
-	protected $elementMap = [];
-	protected $namespaceMap = ['DAV:' => 'd'];
-	protected $contextUri = '/';
+	protected array $elementMap = [];
+	protected array $namespaceMap = ['DAV:' => 'd'];
+	protected string $contextUri = '/';
 
 	private function write($input) {
 		$writer = new Writer();
diff --git a/apps/dav/tests/unit/CalDAV/Publishing/PublishingTest.php b/apps/dav/tests/unit/CalDAV/Publishing/PublishingTest.php
index 8aecdf7f0dd..c66a3639040 100644
--- a/apps/dav/tests/unit/CalDAV/Publishing/PublishingTest.php
+++ b/apps/dav/tests/unit/CalDAV/Publishing/PublishingTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -10,6 +12,7 @@ use OCA\DAV\CalDAV\Publishing\PublishPlugin;
 use OCP\IConfig;
 use OCP\IRequest;
 use OCP\IURLGenerator;
+use PHPUnit\Framework\MockObject\MockObject;
 use Sabre\DAV\Server;
 use Sabre\DAV\SimpleCollection;
 use Sabre\HTTP\Request;
@@ -17,31 +20,21 @@ use Sabre\HTTP\Response;
 use Test\TestCase;
 
 class PublishingTest extends TestCase {
-
-	/** @var PublishPlugin */
-	private $plugin;
-	/** @var Server */
-	private $server;
-	/** @var Calendar | \PHPUnit\Framework\MockObject\MockObject */
-	private $book;
-	/** @var IConfig | \PHPUnit\Framework\MockObject\MockObject */
-	private $config;
-	/** @var IURLGenerator | \PHPUnit\Framework\MockObject\MockObject */
-	private $urlGenerator;
+	private PublishPlugin $plugin;
+	private Server $server;
+	private Calendar&MockObject $book;
+	private IConfig&MockObject $config;
+	private IURLGenerator&MockObject $urlGenerator;
 
 	protected function setUp(): void {
 		parent::setUp();
 
-		$this->config = $this->getMockBuilder(IConfig::class)->
-			disableOriginalConstructor()->
-			getMock();
+		$this->config = $this->createMock(IConfig::class);
 		$this->config->expects($this->any())->method('getSystemValue')
 			->with($this->equalTo('secret'))
 			->willReturn('mysecret');
 
-		$this->urlGenerator = $this->getMockBuilder(IURLGenerator::class)->
-			disableOriginalConstructor()->
-			getMock();
+		$this->urlGenerator = $this->createMock(IURLGenerator::class);
 
 		/** @var IRequest $request */
 		$this->plugin = new PublishPlugin($this->config, $this->urlGenerator);
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php b/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
index e1a0485f8a9..356acf2dd7f 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
@@ -10,27 +10,20 @@ namespace OCA\DAV\Tests\unit\CalDAV\Reminder;
 
 use OCA\DAV\CalDAV\Reminder\Backend as ReminderBackend;
 use OCP\AppFramework\Utility\ITimeFactory;
+use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class BackendTest extends TestCase {
-
-	/**
-	 * Reminder Backend
-	 *
-	 * @var ReminderBackend|\PHPUnit\Framework\MockObject\MockObject
-	 */
-	private $reminderBackend;
-
-	/** @var ITimeFactory|\PHPUnit\Framework\MockObject\MockObject */
-	private $timeFactory;
+	private ReminderBackend $reminderBackend;
+	private ITimeFactory&MockObject $timeFactory;
 
 	protected function setUp(): void {
 		parent::setUp();
 
 		$query = self::$realDatabase->getQueryBuilder();
-		$query->delete('calendar_reminders')->execute();
-		$query->delete('calendarobjects')->execute();
-		$query->delete('calendars')->execute();
+		$query->delete('calendar_reminders')->executeStatement();
+		$query->delete('calendarobjects')->executeStatement();
+		$query->delete('calendars')->executeStatement();
 
 		$this->timeFactory = $this->createMock(ITimeFactory::class);
 		$this->reminderBackend = new ReminderBackend(self::$realDatabase, $this->timeFactory);
@@ -40,9 +33,11 @@ class BackendTest extends TestCase {
 
 	protected function tearDown(): void {
 		$query = self::$realDatabase->getQueryBuilder();
-		$query->delete('calendar_reminders')->execute();
-		$query->delete('calendarobjects')->execute();
-		$query->delete('calendars')->execute();
+		$query->delete('calendar_reminders')->executeStatement();
+		$query->delete('calendarobjects')->executeStatement();
+		$query->delete('calendars')->executeStatement();
+
+		parent::tearDown();
 	}
 
 
@@ -235,7 +230,7 @@ class BackendTest extends TestCase {
 		$query = self::$realDatabase->getQueryBuilder();
 		$rows = $query->select('*')
 			->from('calendar_reminders')
-			->execute()
+			->executeQuery()
 			->fetchAll();
 
 		$this->assertCount(4, $rows);
@@ -251,7 +246,7 @@ class BackendTest extends TestCase {
 		$row = $query->select('notification_date')
 			->from('calendar_reminders')
 			->where($query->expr()->eq('id', $query->createNamedParameter($reminderId)))
-			->execute()
+			->executeQuery()
 			->fetch();
 
 		$this->assertEquals((int)$row['notification_date'], 123700);
@@ -266,7 +261,7 @@ class BackendTest extends TestCase {
 				'principaluri' => $query->createNamedParameter('principals/users/user001'),
 				'displayname' => $query->createNamedParameter('Displayname 123'),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendars')
@@ -275,7 +270,7 @@ class BackendTest extends TestCase {
 				'principaluri' => $query->createNamedParameter('principals/users/user002'),
 				'displayname' => $query->createNamedParameter('Displayname 99'),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendarobjects')
@@ -285,7 +280,7 @@ class BackendTest extends TestCase {
 				'calendarid' => $query->createNamedParameter(1),
 				'size' => $query->createNamedParameter(42),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendarobjects')
@@ -295,7 +290,7 @@ class BackendTest extends TestCase {
 				'calendarid' => $query->createNamedParameter(1),
 				'size' => $query->createNamedParameter(42),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendarobjects')
@@ -305,7 +300,7 @@ class BackendTest extends TestCase {
 				'calendarid' => $query->createNamedParameter(99),
 				'size' => $query->createNamedParameter(42),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendar_reminders')
@@ -323,7 +318,7 @@ class BackendTest extends TestCase {
 				'notification_date' => $query->createNamedParameter(123456),
 				'is_repeat_based' => $query->createNamedParameter(0),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendar_reminders')
@@ -341,7 +336,7 @@ class BackendTest extends TestCase {
 				'notification_date' => $query->createNamedParameter(123456),
 				'is_repeat_based' => $query->createNamedParameter(0),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendar_reminders')
@@ -359,7 +354,7 @@ class BackendTest extends TestCase {
 				'notification_date' => $query->createNamedParameter(123499),
 				'is_repeat_based' => $query->createNamedParameter(0),
 			])
-			->execute();
+			->executeStatement();
 
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendar_reminders')
@@ -377,6 +372,6 @@ class BackendTest extends TestCase {
 				'notification_date' => $query->createNamedParameter(123600),
 				'is_repeat_based' => $query->createNamedParameter(0),
 			])
-			->execute();
+			->executeStatement();
 	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/AbstractNotificationProviderTest.php b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/AbstractNotificationProviderTestCase.php
index 60ef1df43d5..70b374298ea 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/AbstractNotificationProviderTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/AbstractNotificationProviderTestCase.php
@@ -14,44 +14,21 @@ use OCP\IL10N;
 use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\L10N\IFactory as L10NFactory;
+use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 use Sabre\VObject\Component\VCalendar;
 use Test\TestCase;
 
-abstract class AbstractNotificationProviderTest extends TestCase {
-
-	/** @var LoggerInterface|\PHPUnit\Framework\MockObject\MockObject */
-	protected $logger;
-
-	/** @var L10NFactory|\PHPUnit\Framework\MockObject\MockObject */
-	protected $l10nFactory;
-
-	/** @var IL10N|\PHPUnit\Framework\MockObject\MockObject */
-	protected $l10n;
-
-	/** @var IURLGenerator|\PHPUnit\Framework\MockObject\MockObject */
-	protected $urlGenerator;
-
-	/** @var IConfig|\PHPUnit\Framework\MockObject\MockObject */
-	protected $config;
-
-	/** @var AbstractProvider|\PHPUnit\Framework\MockObject\MockObject */
-	protected $provider;
-
-	/**
-	 * @var VCalendar
-	 */
-	protected $vcalendar;
-
-	/**
-	 * @var string
-	 */
-	protected $calendarDisplayName;
-
-	/**
-	 * @var IUser|\PHPUnit\Framework\MockObject\MockObject
-	 */
-	protected $user;
+abstract class AbstractNotificationProviderTestCase extends TestCase {
+	protected LoggerInterface&MockObject $logger;
+	protected L10NFactory&MockObject $l10nFactory;
+	protected IL10N&MockObject $l10n;
+	protected IURLGenerator&MockObject $urlGenerator;
+	protected IConfig&MockObject $config;
+	protected AbstractProvider $provider;
+	protected VCalendar $vcalendar;
+	protected string $calendarDisplayName;
+	protected IUser&MockObject $user;
 
 	protected function setUp(): void {
 		parent::setUp();
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/EmailProviderTest.php b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/EmailProviderTest.php
index 42eb0b0faa3..f7fbac2c407 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/EmailProviderTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/EmailProviderTest.php
@@ -18,11 +18,9 @@ use OCP\Util;
 use PHPUnit\Framework\MockObject\MockObject;
 use Sabre\VObject\Component\VCalendar;
 
-class EmailProviderTest extends AbstractNotificationProviderTest {
+class EmailProviderTest extends AbstractNotificationProviderTestCase {
 	public const USER_EMAIL = 'frodo@hobb.it';
-
-	/** @var IMailer|MockObject */
-	private $mailer;
+	private IMailer&MockObject $mailer;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -97,18 +95,12 @@ class EmailProviderTest extends AbstractNotificationProviderTest {
 
 		$this->mailer->expects($this->exactly(4))
 			->method('validateMailAddress')
-			->withConsecutive(
-				['uid1@example.com'],
-				['uid2@example.com'],
-				['uid3@example.com'],
-				['invalid'],
-			)
-			->willReturnOnConsecutiveCalls(
-				true,
-				true,
-				true,
-				false,
-			);
+			->willReturnMap([
+				['uid1@example.com', true],
+				['uid2@example.com', true],
+				['uid3@example.com', true],
+				['invalid', false],
+			]);
 
 		$this->mailer->expects($this->exactly(3))
 			->method('createMessage')
@@ -119,14 +111,18 @@ class EmailProviderTest extends AbstractNotificationProviderTest {
 				$message22
 			);
 
-		$this->mailer->expects($this->exactly(3))
+		$calls = [
+			[$message11],
+			[$message21],
+			[$message22],
+		];
+		$this->mailer->expects($this->exactly(count($calls)))
 			->method('send')
-			->withConsecutive(
-				[$message11],
-				[$message21],
-				[$message22],
-			)
-			->willReturn([]);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return [];
+			});
 
 		$this->setupURLGeneratorMock(2);
 
@@ -215,16 +211,22 @@ class EmailProviderTest extends AbstractNotificationProviderTest {
 				$message22,
 				$message23,
 			);
-		$this->mailer->expects($this->exactly(6))
+
+		$calls = [
+			[$message11],
+			[$message12],
+			[$message13],
+			[$message21],
+			[$message22],
+			[$message23],
+		];
+		$this->mailer->expects($this->exactly(count($calls)))
 			->method('send')
-			->withConsecutive(
-				[$message11],
-				[$message12],
-				[$message13],
-				[$message21],
-				[$message22],
-				[$message23],
-			)->willReturn([]);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return [];
+			});
 		$this->setupURLGeneratorMock(2);
 
 		$vcalendar = $this->getAttendeeVCalendar();
@@ -293,12 +295,18 @@ class EmailProviderTest extends AbstractNotificationProviderTest {
 				$message12,
 				$message13,
 			);
-		$this->mailer->expects($this->exactly(2))
+
+		$calls = [
+			[$message12],
+			[$message13],
+		];
+		$this->mailer->expects($this->exactly(count($calls)))
 			->method('send')
-			->withConsecutive(
-				[$message12],
-				[$message13],
-			)->willReturn([]);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return [];
+			});
 		$this->setupURLGeneratorMock(1);
 
 		$vcalendar = $this->getAttendeeVCalendar();
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/PushProviderTest.php b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/PushProviderTest.php
index b090fa0e5e7..c601463363b 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/PushProviderTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProvider/PushProviderTest.php
@@ -13,13 +13,11 @@ use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IUser;
 use OCP\Notification\IManager;
 use OCP\Notification\INotification;
+use PHPUnit\Framework\MockObject\MockObject;
 
-class PushProviderTest extends AbstractNotificationProviderTest {
-	/** @var IManager|\PHPUnit\Framework\MockObject\MockObject */
-	private $manager;
-
-	/** @var ITimeFactory|\PHPUnit\Framework\MockObject\MockObject */
-	private $timeFactory;
+class PushProviderTest extends AbstractNotificationProviderTestCase {
+	private IManager&MockObject $manager;
+	private ITimeFactory&MockObject $timeFactory;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -96,20 +94,23 @@ class PushProviderTest extends AbstractNotificationProviderTest {
 
 		$this->manager->expects($this->exactly(3))
 			->method('createNotification')
-			->with()
 			->willReturnOnConsecutiveCalls(
 				$notification1,
 				$notification2,
 				$notification3
 			);
 
+		$calls = [
+			$notification1,
+			$notification2,
+			$notification3,
+		];
 		$this->manager->expects($this->exactly(3))
 			->method('notify')
-			->withConsecutive(
-				[$notification1],
-				[$notification2],
-				[$notification3],
-			);
+			->willReturnCallback(function ($notification) use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, $notification);
+			});
 
 		$this->provider->send($this->vcalendar->VEVENT, $this->calendarDisplayName, [], $users);
 	}
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProviderManagerTest.php b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProviderManagerTest.php
index 6d0e62f505b..6b813ed0228 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/NotificationProviderManagerTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/NotificationProviderManagerTest.php
@@ -21,9 +21,7 @@ use Test\TestCase;
  * @group DB
  */
 class NotificationProviderManagerTest extends TestCase {
-
-	/** @var NotificationProviderManager|\PHPUnit\Framework\MockObject\MockObject */
-	private $providerManager;
+	private NotificationProviderManager $providerManager;
 
 	/**
 	 * @throws QueryException
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/NotifierTest.php b/apps/dav/tests/unit/CalDAV/Reminder/NotifierTest.php
index dcf11a1a6b8..147446152d8 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/NotifierTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/NotifierTest.php
@@ -21,20 +21,11 @@ use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
 class NotifierTest extends TestCase {
-	/** @var Notifier */
-	protected $notifier;
-
-	/** @var IFactory|MockObject */
-	protected $factory;
-
-	/** @var IURLGenerator|MockObject */
-	protected $urlGenerator;
-
-	/** @var IL10N|MockObject */
-	protected $l10n;
-
-	/** @var ITimeFactory|MockObject */
-	protected $timeFactory;
+	protected IFactory&MockObject $factory;
+	protected IURLGenerator&MockObject $urlGenerator;
+	protected IL10N&MockObject $l10n;
+	protected ITimeFactory&MockObject $timeFactory;
+	protected Notifier $notifier;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -92,7 +83,7 @@ class NotifierTest extends TestCase {
 		$this->expectException(UnknownNotificationException::class);
 		$this->expectExceptionMessage('Notification not from this app');
 
-		/** @var INotification|MockObject $notification */
+		/** @var INotification&MockObject $notification */
 		$notification = $this->createMock(INotification::class);
 
 		$notification->expects($this->once())
@@ -109,7 +100,7 @@ class NotifierTest extends TestCase {
 		$this->expectException(UnknownNotificationException::class);
 		$this->expectExceptionMessage('Unknown subject');
 
-		/** @var INotification|MockObject $notification */
+		/** @var INotification&MockObject $notification */
 		$notification = $this->createMock(INotification::class);
 
 		$notification->expects($this->once())
@@ -130,7 +121,7 @@ class NotifierTest extends TestCase {
 		return $d1->diff($d2)->y < 0;
 	}
 
-	public function dataPrepare(): array {
+	public static function dataPrepare(): array {
 		return [
 			[
 				'calendar_reminder',
@@ -181,16 +172,9 @@ class NotifierTest extends TestCase {
 
 	/**
 	 * @dataProvider dataPrepare
-	 *
-	 * @param string $subjectType
-	 * @param array $subjectParams
-	 * @param string $subject
-	 * @param array $messageParams
-	 * @param string $message
-	 * @throws \Exception
 	 */
 	public function testPrepare(string $subjectType, array $subjectParams, string $subject, array $messageParams, string $message): void {
-		/** @var INotification|MockObject $notification */
+		/** @var INotification&MockObject $notification */
 		$notification = $this->createMock(INotification::class);
 
 		$notification->expects($this->once())
@@ -235,7 +219,7 @@ class NotifierTest extends TestCase {
 	}
 
 	public function testPassedEvent(): void {
-		/** @var INotification|MockObject $notification */
+		/** @var INotification&MockObject $notification */
 		$notification = $this->createMock(INotification::class);
 
 		$notification->expects($this->once())
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php b/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
index 198c8d97b12..4b6735ee297 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
@@ -26,35 +26,16 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class ReminderServiceTest extends TestCase {
-	/** @var Backend|MockObject */
-	private $backend;
-
-	/** @var NotificationProviderManager|MockObject */
-	private $notificationProviderManager;
-
-	/** @var IUserManager|MockObject */
-	private $userManager;
-
-	/** @var IGroupManager|MockObject */
-	private $groupManager;
-
-	/** @var CalDavBackend|MockObject */
-	private $caldavBackend;
-
-	/** @var ITimeFactory|MockObject */
-	private $timeFactory;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var ReminderService */
-	private $reminderService;
-
-	/** @var MockObject|LoggerInterface */
-	private $logger;
-
-	/** @var MockObject|Principal */
-	private $principalConnector;
+	private Backend&MockObject $backend;
+	private NotificationProviderManager&MockObject $notificationProviderManager;
+	private IUserManager&MockObject $userManager;
+	private IGroupManager&MockObject $groupManager;
+	private CalDavBackend&MockObject $caldavBackend;
+	private ITimeFactory&MockObject $timeFactory;
+	private IConfig&MockObject $config;
+	private LoggerInterface&MockObject $logger;
+	private Principal&MockObject $principalConnector;
+	private ReminderService $reminderService;
 
 	public const CALENDAR_DATA = <<<EOD
 BEGIN:VCALENDAR
@@ -252,9 +233,7 @@ END:VTIMEZONE
 END:VCALENDAR
 ICS;
 
-
-	/** @var null|string */
-	private $oldTimezone;
+	private ?string $oldTimezone;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -305,13 +284,17 @@ ICS;
 			'component' => 'vevent',
 		];
 
-		$this->backend->expects($this->exactly(2))
+		$calls = [
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'de919af7429d3b5c11e8b9d289b411a6', 'EMAIL', true, 1465429500, false],
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', '35b3eae8e792aa2209f0b4e1a302f105', 'DISPLAY', false, 1465344000, false]
+		];
+		$this->backend->expects($this->exactly(count($calls)))
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'de919af7429d3b5c11e8b9d289b411a6', 'EMAIL', true, 1465429500, false],
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', '35b3eae8e792aa2209f0b4e1a302f105', 'DISPLAY', false, 1465344000, false]
-			)
-			->willReturn(1);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return 1;
+			});
 
 		$this->timeFactory->expects($this->once())
 			->method('getDateTime')
@@ -353,12 +336,7 @@ EOD;
 		];
 
 		$this->backend->expects($this->never())
-			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', false, null, false, '5c70531aab15c92b52518ae10a2f78a4', 'de919af7429d3b5c11e8b9d289b411a6', 'EMAIL', true, 1465429500, false],
-				[1337, 42, 'wej2z68l9h', false, null, false, '5c70531aab15c92b52518ae10a2f78a4', '35b3eae8e792aa2209f0b4e1a302f105', 'DISPLAY', false, 1465344000, false]
-			)
-			->willReturn(1);
+			->method('insertReminder');
 
 		$this->reminderService->onCalendarObjectCreate($objectData);
 	}
@@ -371,16 +349,20 @@ EOD;
 			'component' => 'vevent',
 		];
 
-		$this->backend->expects($this->exactly(5))
+		$calls = [
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429500, false],
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429620, true],
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429740, true],
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429860, true],
+			[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429980, true]
+		];
+		$this->backend->expects($this->exactly(count($calls)))
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429500, false],
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429620, true],
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429740, true],
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429860, true],
-				[1337, 42, 'wej2z68l9h', false, 1465430400, false, '5c70531aab15c92b52518ae10a2f78a4', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1465429980, true]
-			)
-			->willReturn(1);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return 1;
+			});
 
 		$this->timeFactory->expects($this->once())
 			->method('getDateTime')
@@ -398,13 +380,17 @@ EOD;
 			'component' => 'vevent',
 		];
 
-		$this->backend->expects($this->exactly(2))
+		$calls = [
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'de919af7429d3b5c11e8b9d289b411a6', 'EMAIL', true, 1467243900, false],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467158400, false]
+		];
+		$this->backend->expects($this->exactly(count($calls)))
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'de919af7429d3b5c11e8b9d289b411a6', 'EMAIL', true, 1467243900, false],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467158400, false]
-			)
-			->willReturn(1);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return 1;
+			});
 
 		$this->timeFactory->expects($this->once())
 			->method('getDateTime')
@@ -521,17 +507,23 @@ EOD;
 			->willReturn([
 				'{urn:ietf:params:xml:ns:caldav}calendar-timezone' => null,
 			]);
-		$this->backend->expects($this->exactly(6))
+
+		$calls = [
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467243900, false],
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244020, true],
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244140, true],
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244260, true],
+			[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244380, true],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467158400, false]
+		];
+		$this->backend->expects($this->exactly(count($calls)))
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467243900, false],
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244020, true],
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244140, true],
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244260, true],
-				[1337, 42, 'wej2z68l9h', true, 1467244800, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467244380, true],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467158400, false]
-			)
-			->willReturn(1);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+				return 1;
+			});
+
 		$this->timeFactory->expects($this->once())
 			->method('getDateTime')
 			->with()
@@ -556,9 +548,7 @@ EOD;
 		$expectedReminderTimstamp = (new DateTime('2023-02-04T08:00:00', new DateTimeZone('Europe/Vienna')))->getTimestamp();
 		$this->backend->expects(self::once())
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, self::anything(), false, self::anything(), false, self::anything(), self::anything(), self::anything(), true, $expectedReminderTimstamp, false],
-			)
+			->with(1337, 42, self::anything(), false, self::anything(), false, self::anything(), self::anything(), self::anything(), true, $expectedReminderTimstamp, false)
 			->willReturn(1);
 		$this->caldavBackend->expects(self::once())
 			->method('getCalendarById')
@@ -684,22 +674,22 @@ EOD;
 		$provider3 = $this->createMock(INotificationProvider::class);
 		$provider4 = $this->createMock(INotificationProvider::class);
 		$provider5 = $this->createMock(INotificationProvider::class);
-		$this->notificationProviderManager->expects($this->exactly(5))
+
+		$getProviderCalls = [
+			['EMAIL', $provider1],
+			['EMAIL', $provider2],
+			['DISPLAY', $provider3],
+			['EMAIL', $provider4],
+			['EMAIL', $provider5],
+		];
+		$this->notificationProviderManager->expects($this->exactly(count($getProviderCalls)))
 			->method('getProvider')
-			->withConsecutive(
-				['EMAIL'],
-				['EMAIL'],
-				['DISPLAY'],
-				['EMAIL'],
-				['EMAIL'],
-			)
-			->willReturnOnConsecutiveCalls(
-				$provider1,
-				$provider2,
-				$provider3,
-				$provider4,
-				$provider5,
-			);
+			->willReturnCallback(function () use (&$getProviderCalls) {
+				$expected = array_shift($getProviderCalls);
+				$return = array_pop($expected);
+				$this->assertEquals($expected, func_get_args());
+				return $return;
+			});
 
 		$user = $this->createMock(IUser::class);
 		$this->userManager->expects($this->exactly(5))
@@ -748,20 +738,36 @@ EOD;
 				return true;
 			}, 'Displayname 123', $user));
 
+		$removeReminderCalls = [
+			[1],
+			[2],
+			[3],
+			[4],
+			[5],
+		];
 		$this->backend->expects($this->exactly(5))
 			->method('removeReminder')
-			->withConsecutive([1], [2], [3], [4], [5]);
-		$this->backend->expects($this->exactly(6))
+			->willReturnCallback(function () use (&$removeReminderCalls) {
+				$expected = array_shift($removeReminderCalls);
+				$this->assertEquals($expected, func_get_args());
+			});
+
+
+		$insertReminderCalls = [
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848700, false],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848820, true],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848940, true],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467849060, true],
+			[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467849180, true],
+			[1337, 42, 'wej2z68l9h', true, 1468454400, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467763200, false],
+		];
+		$this->backend->expects($this->exactly(count($insertReminderCalls)))
 			->method('insertReminder')
-			->withConsecutive(
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848700, false],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848820, true],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467848940, true],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467849060, true],
-				[1337, 42, 'wej2z68l9h', true, 1467849600, false, 'fbdb2726bc0f7dfacac1d881c1453e20', 'ecacbf07d413c3c78d1ac7ad8c469602', 'EMAIL', true, 1467849180, true],
-				[1337, 42, 'wej2z68l9h', true, 1468454400, false, 'fbdb2726bc0f7dfacac1d881c1453e20', '8996992118817f9f311ac5cc56d1cc97', 'EMAIL', true, 1467763200, false],
-			)
-			->willReturn(99);
+			->willReturnCallback(function () use (&$insertReminderCalls) {
+				$expected = array_shift($insertReminderCalls);
+				$this->assertEquals($expected, func_get_args());
+				return 99;
+			});
 
 		$this->timeFactory->method('getDateTime')
 			->willReturn(DateTime::createFromFormat(DateTime::ATOM, '2016-06-08T00:00:00+00:00'));
diff --git a/apps/dav/tests/unit/CalDAV/ResourceBooking/AbstractPrincipalBackendTest.php b/apps/dav/tests/unit/CalDAV/ResourceBooking/AbstractPrincipalBackendTestCase.php
index b2fd9cfb93f..26dbcc0f38c 100644
--- a/apps/dav/tests/unit/CalDAV/ResourceBooking/AbstractPrincipalBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/ResourceBooking/AbstractPrincipalBackendTestCase.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -12,40 +14,22 @@ use OCA\DAV\CalDAV\ResourceBooking\RoomPrincipalBackend;
 use OCP\IGroupManager;
 use OCP\IUser;
 use OCP\IUserSession;
+use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 use Sabre\DAV\PropPatch;
 use Test\TestCase;
 
-abstract class AbstractPrincipalBackendTest extends TestCase {
-	/** @var ResourcePrincipalBackend|RoomPrincipalBackend */
-	protected $principalBackend;
-
-	/** @var IUserSession|\PHPUnit\Framework\MockObject\MockObject */
-	protected $userSession;
-
-	/** @var IGroupManager|\PHPUnit\Framework\MockObject\MockObject */
-	protected $groupManager;
-
-	/** @var LoggerInterface|\PHPUnit\Framework\MockObject\MockObject */
-	protected $logger;
-
-	/** @var ProxyMapper|\PHPUnit\Framework\MockObject\MockObject */
-	protected $proxyMapper;
-
-	/** @var string */
-	protected $mainDbTable;
-
-	/** @var string */
-	protected $metadataDbTable;
-
-	/** @var string */
-	protected $foreignKey;
-
-	/** @var string */
-	protected $principalPrefix;
-
-	/** @var string */
-	protected $expectedCUType;
+abstract class AbstractPrincipalBackendTestCase extends TestCase {
+	protected ResourcePrincipalBackend|RoomPrincipalBackend $principalBackend;
+	protected IUserSession&MockObject $userSession;
+	protected IGroupManager&MockObject $groupManager;
+	protected LoggerInterface&MockObject $logger;
+	protected ProxyMapper&MockObject $proxyMapper;
+	protected string $mainDbTable;
+	protected string $metadataDbTable;
+	protected string $foreignKey;
+	protected string $principalPrefix;
+	protected string $expectedCUType;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -59,10 +43,10 @@ abstract class AbstractPrincipalBackendTest extends TestCase {
 	protected function tearDown(): void {
 		$query = self::$realDatabase->getQueryBuilder();
 
-		$query->delete('calendar_resources')->execute();
-		$query->delete('calendar_resources_md')->execute();
-		$query->delete('calendar_rooms')->execute();
-		$query->delete('calendar_rooms_md')->execute();
+		$query->delete('calendar_resources')->executeStatement();
+		$query->delete('calendar_resources_md')->executeStatement();
+		$query->delete('calendar_rooms')->executeStatement();
+		$query->delete('calendar_rooms_md')->executeStatement();
 	}
 
 	public function testGetPrincipalsByPrefix(): void {
@@ -214,38 +198,43 @@ abstract class AbstractPrincipalBackendTest extends TestCase {
 			->with($this->principalPrefix . '/backend1-res1')
 			->willReturn([]);
 
+		$calls = [
+			function ($proxy) {
+				/** @var Proxy $proxy */
+				if ($proxy->getOwnerId() !== $this->principalPrefix . '/backend1-res1') {
+					return false;
+				}
+				if ($proxy->getProxyId() !== $this->principalPrefix . '/backend1-res2') {
+					return false;
+				}
+				if ($proxy->getPermissions() !== 3) {
+					return false;
+				}
+
+				return true;
+			},
+			function ($proxy) {
+				/** @var Proxy $proxy */
+				if ($proxy->getOwnerId() !== $this->principalPrefix . '/backend1-res1') {
+					return false;
+				}
+				if ($proxy->getProxyId() !== $this->principalPrefix . '/backend2-res3') {
+					return false;
+				}
+				if ($proxy->getPermissions() !== 3) {
+					return false;
+				}
+
+				return true;
+			}
+		];
 		$this->proxyMapper->expects($this->exactly(2))
 			->method('insert')
-			->withConsecutive(
-				[$this->callback(function ($proxy) {
-					/** @var Proxy $proxy */
-					if ($proxy->getOwnerId() !== $this->principalPrefix . '/backend1-res1') {
-						return false;
-					}
-					if ($proxy->getProxyId() !== $this->principalPrefix . '/backend1-res2') {
-						return false;
-					}
-					if ($proxy->getPermissions() !== 3) {
-						return false;
-					}
-
-					return true;
-				})],
-				[$this->callback(function ($proxy) {
-					/** @var Proxy $proxy */
-					if ($proxy->getOwnerId() !== $this->principalPrefix . '/backend1-res1') {
-						return false;
-					}
-					if ($proxy->getProxyId() !== $this->principalPrefix . '/backend2-res3') {
-						return false;
-					}
-					if ($proxy->getPermissions() !== 3) {
-						return false;
-					}
-
-					return true;
-				})],
-			);
+			->willReturnCallback(function ($proxy) use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertTrue($expected($proxy));
+				return $proxy;
+			});
 
 		$this->principalBackend->setGroupMemberSet($this->principalPrefix . '/backend1-res1/calendar-proxy-write', [$this->principalPrefix . '/backend1-res2', $this->principalPrefix . '/backend2-res3']);
 	}
@@ -281,7 +270,7 @@ abstract class AbstractPrincipalBackendTest extends TestCase {
 			$actual);
 	}
 
-	public function dataSearchPrincipals() {
+	public static function dataSearchPrincipals(): array {
 		// data providers are called before we subclass
 		// this class, $this->principalPrefix is null
 		// at that point, so we need this hack
diff --git a/apps/dav/tests/unit/CalDAV/ResourceBooking/ResourcePrincipalBackendTest.php b/apps/dav/tests/unit/CalDAV/ResourceBooking/ResourcePrincipalBackendTest.php
index d430afb0b01..168e21c3a91 100644
--- a/apps/dav/tests/unit/CalDAV/ResourceBooking/ResourcePrincipalBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/ResourceBooking/ResourcePrincipalBackendTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -7,7 +9,7 @@ namespace OCA\DAV\Tests\unit\CalDAV\ResourceBooking;
 
 use OCA\DAV\CalDAV\ResourceBooking\ResourcePrincipalBackend;
 
-class ResourcePrincipalBackendTest extends AbstractPrincipalBackendTest {
+class ResourcePrincipalBackendTest extends AbstractPrincipalBackendTestCase {
 	protected function setUp(): void {
 		parent::setUp();
 
diff --git a/apps/dav/tests/unit/CalDAV/ResourceBooking/RoomPrincipalBackendTest.php b/apps/dav/tests/unit/CalDAV/ResourceBooking/RoomPrincipalBackendTest.php
index cd63a3512ae..8a53b0ee25e 100644
--- a/apps/dav/tests/unit/CalDAV/ResourceBooking/RoomPrincipalBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/ResourceBooking/RoomPrincipalBackendTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -7,7 +9,7 @@ namespace OCA\DAV\Tests\unit\CalDAV\ResourceBooking;
 
 use OCA\DAV\CalDAV\ResourceBooking\RoomPrincipalBackend;
 
-class RoomPrincipalBackendTest extends AbstractPrincipalBackendTest {
+class RoomPrincipalBackendTest extends AbstractPrincipalBackendTestCase {
 	protected function setUp(): void {
 		parent::setUp();
 
diff --git a/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php b/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
index 896d7e9eb5f..8e71bfa6edf 100644
--- a/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -36,54 +38,22 @@ interface IMailServiceMock extends IMailService, IMailMessageSend {
 }
 
 class IMipPluginTest extends TestCase {
-
-	/** @var IMessage|MockObject */
-	private $mailMessage;
-
-	/** @var IMailer|MockObject */
-	private $mailer;
-
-	/** @var IEMailTemplate|MockObject */
-	private $emailTemplate;
-
-	/** @var IAttachment|MockObject */
-	private $emailAttachment;
-
-	/** @var ITimeFactory|MockObject */
-	private $timeFactory;
-
-	/** @var IAppConfig|MockObject */
-	private $config;
-
-	/** @var IUserSession|MockObject */
-	private $userSession;
-
-	/** @var IUser|MockObject */
-	private $user;
-
-	/** @var IMipPlugin */
-	private $plugin;
-
-	/** @var IMipService|MockObject */
-	private $service;
-
-	/** @var Defaults|MockObject */
-	private $defaults;
-
-	/** @var LoggerInterface|MockObject */
-	private $logger;
-
-	/** @var EventComparisonService|MockObject */
-	private $eventComparisonService;
-
-	/** @var IMailManager|MockObject */
-	private $mailManager;
-
-	/** @var IMailService|IMailMessageSend|MockObject */
-	private $mailService;
-
-	/** @var IMailMessageNew|MockObject */
-	private $mailMessageNew;
+	private IMessage&MockObject $mailMessage;
+	private IMailer&MockObject $mailer;
+	private IEMailTemplate&MockObject $emailTemplate;
+	private IAttachment&MockObject $emailAttachment;
+	private ITimeFactory&MockObject $timeFactory;
+	private IAppConfig&MockObject $config;
+	private IUserSession&MockObject $userSession;
+	private IUser&MockObject $user;
+	private IMipPlugin $plugin;
+	private IMipService&MockObject $service;
+	private Defaults&MockObject $defaults;
+	private LoggerInterface&MockObject $logger;
+	private EventComparisonService&MockObject $eventComparisonService;
+	private IMailManager&MockObject $mailManager;
+	private IMailServiceMock&MockObject $mailService;
+	private IMailMessageNew&MockObject $mailMessageNew;
 
 	protected function setUp(): void {
 		$this->mailMessage = $this->createMock(IMessage::class);
diff --git a/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php b/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
index abf8cfe3177..2be6a1cf8b1 100644
--- a/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Schedule/IMipServiceTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -8,15 +9,14 @@
 
 namespace OCA\DAV\Tests\unit\CalDAV\Schedule;
 
-use OC\L10N\L10N;
-use OC\L10N\LazyL10N;
 use OC\URLGenerator;
 use OCA\DAV\CalDAV\EventReader;
 use OCA\DAV\CalDAV\Schedule\IMipService;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IConfig;
 use OCP\IDBConnection;
-use OCP\L10N\IFactory as L10NFactory;
+use OCP\IL10N;
+use OCP\L10N\IFactory;
 use OCP\Security\ISecureRandom;
 use PHPUnit\Framework\MockObject\MockObject;
 use Sabre\VObject\Component\VCalendar;
@@ -24,48 +24,32 @@ use Sabre\VObject\Property\ICalendar\DateTime;
 use Test\TestCase;
 
 class IMipServiceTest extends TestCase {
-	/** @var URLGenerator|MockObject */
-	private $urlGenerator;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var IDBConnection|MockObject */
-	private $db;
-
-	/** @var ISecureRandom|MockObject */
-	private $random;
-
-	/** @var L10NFactory|MockObject */
-	private $l10nFactory;
-
-	/** @var L10N|MockObject */
-	private $l10n;
-
-	/** @var ITimeFactory|MockObject */
-	private $timeFactory;
-
-	/** @var IMipService */
-	private $service;
-
-	/** @var VCalendar */
-	private $vCalendar1a;
-	/** @var VCalendar */
-	private $vCalendar1b;
-	/** @var VCalendar */
-	private $vCalendar2;
-	/** @var VCalendar */
-	private $vCalendar3;
+	private URLGenerator&MockObject $urlGenerator;
+	private IConfig&MockObject $config;
+	private IDBConnection&MockObject $db;
+	private ISecureRandom&MockObject $random;
+	private IFactory&MockObject $l10nFactory;
+	private IL10N&MockObject $l10n;
+	private ITimeFactory&MockObject $timeFactory;
+	private IMipService $service;
+
+
+	private VCalendar $vCalendar1a;
+	private VCalendar $vCalendar1b;
+	private VCalendar $vCalendar2;
+	private VCalendar $vCalendar3;
 	/** @var DateTime DateTime object that will be returned by DateTime() or DateTime('now') */
 	public static $datetimeNow;
 
 	protected function setUp(): void {
+		parent::setUp();
+
 		$this->urlGenerator = $this->createMock(URLGenerator::class);
 		$this->config = $this->createMock(IConfig::class);
 		$this->db = $this->createMock(IDBConnection::class);
 		$this->random = $this->createMock(ISecureRandom::class);
-		$this->l10nFactory = $this->createMock(L10NFactory::class);
-		$this->l10n = $this->createMock(LazyL10N::class);
+		$this->l10nFactory = $this->createMock(IFactory::class);
+		$this->l10n = $this->createMock(IL10N::class);
 		$this->timeFactory = $this->createMock(ITimeFactory::class);
 		$this->l10nFactory->expects(self::once())
 			->method('findGenericLanguage')
@@ -170,7 +154,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testBuildBodyDataCreated(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -218,7 +202,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testBuildBodyDataUpdate(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -349,7 +333,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringSingular(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -802,7 +786,7 @@ class IMipServiceTest extends TestCase {
 			'In 2 months on July 1, 2024 for the entire day',
 			$this->service->generateWhenString($eventReader)
 		);
-		
+
 		/** test patrial day event in 1 year*/
 		$vCalendar = clone $this->vCalendar1a;
 		// construct event reader
@@ -846,7 +830,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringRecurringDaily(): void {
-		
+
 		// construct l10n return maps
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -960,7 +944,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringRecurringWeekly(): void {
-		
+
 		// construct l10n return maps
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1077,7 +1061,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringRecurringMonthly(): void {
-		
+
 		// construct l10n return maps
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1290,7 +1274,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringRecurringYearly(): void {
-		
+
 		// construct l10n return maps
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1504,7 +1488,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateWhenStringRecurringFixed(): void {
-		
+
 		// construct l10n return maps
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1545,7 +1529,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateOccurringStringWithRrule(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1602,7 +1586,7 @@ class IMipServiceTest extends TestCase {
 				'In 2 days on July 1, 2024 then on July 3, 2024 and July 5, 2024'
 			],
 		]);
-		
+
 		// construct time factory return(s)
 		$this->timeFactory->method('getDateTime')->willReturnOnConsecutiveCalls(
 			(new \DateTime('20240629T170000', (new \DateTimeZone('America/Toronto')))),
@@ -1687,7 +1671,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateOccurringStringWithRdate(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -1838,7 +1822,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateOccurringStringWithOneExdate(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
@@ -2022,7 +2006,7 @@ class IMipServiceTest extends TestCase {
 	}
 
 	public function testGenerateOccurringStringWithTwoExdate(): void {
-		
+
 		// construct l10n return(s)
 		$this->l10n->method('l')->willReturnCallback(
 			function ($v1, $v2, $v3) {
diff --git a/apps/dav/tests/unit/CalDAV/Schedule/PluginTest.php b/apps/dav/tests/unit/CalDAV/Schedule/PluginTest.php
index f656a0fa33c..5dadb753a79 100644
--- a/apps/dav/tests/unit/CalDAV/Schedule/PluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Schedule/PluginTest.php
@@ -1,5 +1,6 @@
 <?php
 
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -35,21 +36,11 @@ use Sabre\Xml\Service;
 use Test\TestCase;
 
 class PluginTest extends TestCase {
-
-	/** @var Plugin */
-	private $plugin;
-
-	/** @var Server|MockObject */
-	private $server;
-
-	/** @var IConfig|MockObject */
-	private $config;
-
-	/** @var LoggerInterface&MockObject */
-	private $logger;
-
-	/** @var DefaultCalendarValidator */
-	private $calendarValidator;
+	private Plugin $plugin;
+	private Server&MockObject $server;
+	private IConfig&MockObject $config;
+	private LoggerInterface&MockObject $logger;
+	private DefaultCalendarValidator $calendarValidator;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -59,9 +50,7 @@ class PluginTest extends TestCase {
 		$this->calendarValidator = new DefaultCalendarValidator();
 
 		$this->server = $this->createMock(Server::class);
-		$this->server->httpResponse = $this->getMockBuilder(ResponseInterface::class)
-			->disableOriginalConstructor()
-			->getMock();
+		$this->server->httpResponse = $this->createMock(ResponseInterface::class);
 		$this->server->xml = new Service();
 
 		$this->plugin = new Plugin($this->config, $this->logger, $this->calendarValidator);
@@ -69,23 +58,26 @@ class PluginTest extends TestCase {
 	}
 
 	public function testInitialize(): void {
-
-		$this->server->expects($this->exactly(10))
+		$calls = [
+			// Sabre\CalDAV\Schedule\Plugin events
+			['method:POST', [$this->plugin, 'httpPost'], 100],
+			['propFind', [$this->plugin, 'propFind'], 100],
+			['propPatch', [$this->plugin, 'propPatch'], 100],
+			['calendarObjectChange', [$this->plugin, 'calendarObjectChange'], 100],
+			['beforeUnbind', [$this->plugin, 'beforeUnbind'], 100],
+			['schedule', [$this->plugin, 'scheduleLocalDelivery'], 100],
+			['getSupportedPrivilegeSet', [$this->plugin, 'getSupportedPrivilegeSet'], 100],
+			// OCA\DAV\CalDAV\Schedule\Plugin events
+			['propFind', [$this->plugin, 'propFindDefaultCalendarUrl'], 90],
+			['afterWriteContent', [$this->plugin, 'dispatchSchedulingResponses'], 100],
+			['afterCreateFile', [$this->plugin, 'dispatchSchedulingResponses'], 100],
+		];
+		$this->server->expects($this->exactly(count($calls)))
 			->method('on')
-			->withConsecutive(
-				// Sabre\CalDAV\Schedule\Plugin events
-				['method:POST', [$this->plugin, 'httpPost']],
-				['propFind', [$this->plugin, 'propFind']],
-				['propPatch', [$this->plugin, 'propPatch']],
-				['calendarObjectChange', [$this->plugin, 'calendarObjectChange']],
-				['beforeUnbind', [$this->plugin, 'beforeUnbind']],
-				['schedule', [$this->plugin, 'scheduleLocalDelivery']],
-				['getSupportedPrivilegeSet', [$this->plugin, 'getSupportedPrivilegeSet']],
-				// OCA\DAV\CalDAV\Schedule\Plugin events
-				['propFind', [$this->plugin, 'propFindDefaultCalendarUrl'], 90],
-				['afterWriteContent', [$this->plugin, 'dispatchSchedulingResponses']],
-				['afterCreateFile', [$this->plugin, 'dispatchSchedulingResponses']]
-			);
+			->willReturnCallback(function () use (&$calls) {
+				$expected = array_shift($calls);
+				$this->assertEquals($expected, func_get_args());
+			});
 
 		$this->plugin->initialize($this->server);
 	}
@@ -168,7 +160,7 @@ class PluginTest extends TestCase {
 		$this->assertFalse($this->invokePrivate($this->plugin, 'getAttendeeRSVP', [$property3]));
 	}
 
-	public function propFindDefaultCalendarUrlProvider(): array {
+	public static function propFindDefaultCalendarUrlProvider(): array {
 		return [
 			[
 				'principals/users/myuser',
@@ -270,7 +262,7 @@ class PluginTest extends TestCase {
 			],
 			0
 		);
-		/** @var IPrincipal|MockObject $node */
+		/** @var IPrincipal&MockObject $node */
 		$node = $this->getMockBuilder(IPrincipal::class)
 			->disableOriginalConstructor()
 			->getMock();
@@ -367,7 +359,7 @@ class PluginTest extends TestCase {
 			}
 		}
 
-		/** @var Tree|MockObject $tree */
+		/** @var Tree&MockObject $tree */
 		$tree = $this->createMock(Tree::class);
 		$tree->expects($this->once())
 			->method('getNodeForPath')
diff --git a/apps/dav/tests/unit/CalDAV/Search/Request/CalendarSearchReportTest.php b/apps/dav/tests/unit/CalDAV/Search/Request/CalendarSearchReportTest.php
index cbfd4639ed7..a7ca6eb8945 100644
--- a/apps/dav/tests/unit/CalDAV/Search/Request/CalendarSearchReportTest.php
+++ b/apps/dav/tests/unit/CalDAV/Search/Request/CalendarSearchReportTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -10,7 +12,7 @@ use Sabre\Xml\Reader;
 use Test\TestCase;
 
 class CalendarSearchReportTest extends TestCase {
-	private $elementMap = [
+	private array $elementMap = [
 		'{http://nextcloud.com/ns}calendar-search' =>
 			'OCA\\DAV\\CalDAV\\Search\\Xml\\Request\\CalendarSearchReport',
 	];
@@ -112,7 +114,7 @@ XML;
 		);
 	}
 
-	
+
 	public function testRequiresCompFilter(): void {
 		$this->expectException(\Sabre\DAV\Exception\BadRequest::class);
 		$this->expectExceptionMessage('{http://nextcloud.com/ns}prop-filter or {http://nextcloud.com/ns}param-filter given without any {http://nextcloud.com/ns}comp-filter');
@@ -139,7 +141,7 @@ XML;
 		$this->parse($xml);
 	}
 
-	
+
 	public function testRequiresFilter(): void {
 		$this->expectException(\Sabre\DAV\Exception\BadRequest::class);
 		$this->expectExceptionMessage('The {http://nextcloud.com/ns}filter element is required for this request');
@@ -157,7 +159,7 @@ XML;
 		$this->parse($xml);
 	}
 
-	
+
 	public function testNoSearchTerm(): void {
 		$this->expectException(\Sabre\DAV\Exception\BadRequest::class);
 		$this->expectExceptionMessage('{http://nextcloud.com/ns}search-term is required for this request');
@@ -185,7 +187,7 @@ XML;
 		$this->parse($xml);
 	}
 
-	
+
 	public function testCompOnly(): void {
 		$this->expectException(\Sabre\DAV\Exception\BadRequest::class);
 		$this->expectExceptionMessage('At least one{http://nextcloud.com/ns}prop-filter or {http://nextcloud.com/ns}param-filter is required for this request');
@@ -313,7 +315,7 @@ XML;
 		);
 	}
 
-	private function parse($xml, array $elementMap = []) {
+	private function parse(string $xml, array $elementMap = []): array {
 		$reader = new Reader();
 		$reader->elementMap = array_merge($this->elementMap, $elementMap);
 		$reader->xml($xml);
diff --git a/apps/dav/tests/unit/CalDAV/Search/SearchPluginTest.php b/apps/dav/tests/unit/CalDAV/Search/SearchPluginTest.php
index 0da971dc36b..e576fbae34c 100644
--- a/apps/dav/tests/unit/CalDAV/Search/SearchPluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Search/SearchPluginTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/apps/dav/tests/unit/CalDAV/Security/RateLimitingPluginTest.php b/apps/dav/tests/unit/CalDAV/Security/RateLimitingPluginTest.php
index fc0bd1502b2..a5cf6a23c66 100644
--- a/apps/dav/tests/unit/CalDAV/Security/RateLimitingPluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Security/RateLimitingPluginTest.php
@@ -24,11 +24,11 @@ use Test\TestCase;
 
 class RateLimitingPluginTest extends TestCase {
 
-	private Limiter|MockObject $limiter;
-	private CalDavBackend|MockObject $caldavBackend;
-	private IUserManager|MockObject $userManager;
-	private LoggerInterface|MockObject $logger;
-	private IAppConfig|MockObject $config;
+	private Limiter&MockObject $limiter;
+	private CalDavBackend&MockObject $caldavBackend;
+	private IUserManager&MockObject $userManager;
+	private LoggerInterface&MockObject $logger;
+	private IAppConfig&MockObject $config;
 	private string $userId = 'user123';
 	private RateLimitingPlugin $plugin;
 
diff --git a/apps/dav/tests/unit/CalDAV/Status/StatusServiceTest.php b/apps/dav/tests/unit/CalDAV/Status/StatusServiceTest.php
index 78e76cf507d..ee0ef2334ec 100644
--- a/apps/dav/tests/unit/CalDAV/Status/StatusServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Status/StatusServiceTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -25,14 +27,14 @@ use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
 class StatusServiceTest extends TestCase {
-	private ITimeFactory|MockObject $timeFactory;
-	private IManager|MockObject $calendarManager;
-	private IUserManager|MockObject $userManager;
-	private UserStatusService|MockObject $userStatusService;
-	private IAvailabilityCoordinator|MockObject $availabilityCoordinator;
-	private ICacheFactory|MockObject $cacheFactory;
-	private LoggerInterface|MockObject $logger;
-	private ICache|MockObject $cache;
+	private ITimeFactory&MockObject $timeFactory;
+	private IManager&MockObject $calendarManager;
+	private IUserManager&MockObject $userManager;
+	private UserStatusService&MockObject $userStatusService;
+	private IAvailabilityCoordinator&MockObject $availabilityCoordinator;
+	private ICacheFactory&MockObject $cacheFactory;
+	private LoggerInterface&MockObject $logger;
+	private ICache&MockObject $cache;
 	private StatusService $service;
 
 	protected function setUp(): void {
diff --git a/apps/dav/tests/unit/CalDAV/TimeZoneFactoryTest.php b/apps/dav/tests/unit/CalDAV/TimeZoneFactoryTest.php
index d5a62a9732f..2d6d0e86358 100644
--- a/apps/dav/tests/unit/CalDAV/TimeZoneFactoryTest.php
+++ b/apps/dav/tests/unit/CalDAV/TimeZoneFactoryTest.php
@@ -1,7 +1,6 @@
 <?php
 
 declare(strict_types=1);
-
 /**
  * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php b/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php
index b01139e4093..5bb87be67c1 100644
--- a/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php
@@ -1,11 +1,6 @@
 <?php
-/**
- * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
 
 declare(strict_types=1);
-
 /**
  * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -26,10 +21,9 @@ use Sabre\VObject\Component\VTimeZone;
 use Test\TestCase;
 
 class TimezoneServiceTest extends TestCase {
-
-	private IConfig|MockObject $config;
-	private PropertyMapper|MockObject $propertyMapper;
-	private IManager|MockObject $calendarManager;
+	private IConfig&MockObject $config;
+	private PropertyMapper&MockObject $propertyMapper;
+	private IManager&MockObject $calendarManager;
 	private TimezoneService $service;
 
 	protected function setUp(): void {
diff --git a/apps/dav/tests/unit/CalDAV/TipBrokerTest.php b/apps/dav/tests/unit/CalDAV/TipBrokerTest.php
index 3a8e240c1d8..ddf992767d6 100644
--- a/apps/dav/tests/unit/CalDAV/TipBrokerTest.php
+++ b/apps/dav/tests/unit/CalDAV/TipBrokerTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
@@ -42,7 +44,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnCreate(): void {
-		
+
 		// construct calendar and generate event info for newly created event with one attendee
 		$calendar = clone $this->vCalendar1a;
 		$previousEventInfo = [
@@ -61,7 +63,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnModify(): void {
-		
+
 		// construct calendar and generate event info for modified event with one attendee
 		$calendar = clone $this->vCalendar1a;
 		$previousEventInfo = $this->invokePrivate($this->broker, 'parseEventInfo', [$calendar]);
@@ -79,7 +81,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnDelete(): void {
-		
+
 		// construct calendar and generate event info for modified event with one attendee
 		$calendar = clone $this->vCalendar1a;
 		$previousEventInfo = $this->invokePrivate($this->broker, 'parseEventInfo', [$calendar]);
@@ -96,7 +98,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnStatusCancelled(): void {
-		
+
 		// construct calendar and generate event info for modified event with one attendee
 		$calendar = clone $this->vCalendar1a;
 		$previousEventInfo = $this->invokePrivate($this->broker, 'parseEventInfo', [$calendar]);
@@ -114,7 +116,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnAddAttendee(): void {
-		
+
 		// construct calendar and generate event info for modified event with two attendees
 		$calendar = clone $this->vCalendar1a;
 		$previousEventInfo = $this->invokePrivate($this->broker, 'parseEventInfo', [$calendar]);
@@ -141,7 +143,7 @@ class TipBrokerTest extends TestCase {
 	}
 
 	public function testParseEventForOrganizerOnRemoveAttendee(): void {
-		
+
 		// construct calendar and generate event info for modified event with two attendees
 		$calendar = clone $this->vCalendar1a;
 		$calendar->VEVENT->add('ATTENDEE', 'mailto:attendee2@testing.com', [
diff --git a/apps/dav/tests/unit/CalDAV/Validation/CalDavValidatePluginTest.php b/apps/dav/tests/unit/CalDAV/Validation/CalDavValidatePluginTest.php
index 0329279af09..74fb4b5e94e 100644
--- a/apps/dav/tests/unit/CalDAV/Validation/CalDavValidatePluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Validation/CalDavValidatePluginTest.php
@@ -18,11 +18,11 @@ use Sabre\HTTP\ResponseInterface;
 use Test\TestCase;
 
 class CalDavValidatePluginTest extends TestCase {
+	private IAppConfig&MockObject $config;
+	private RequestInterface&MockObject $request;
+	private ResponseInterface&MockObject $response;
 
 	private CalDavValidatePlugin $plugin;
-	private IAppConfig|MockObject $config;
-	private RequestInterface|MockObject $request;
-	private ResponseInterface|MockObject $response;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -36,7 +36,7 @@ class CalDavValidatePluginTest extends TestCase {
 	}
 
 	public function testPutSizeLessThenLimit(): void {
-		
+
 		// construct method responses
 		$this->config
 			->method('getValueInt')
@@ -50,11 +50,11 @@ class CalDavValidatePluginTest extends TestCase {
 		$this->assertTrue(
 			$this->plugin->beforePut($this->request, $this->response)
 		);
-		
+
 	}
 
 	public function testPutSizeMoreThenLimit(): void {
-		
+
 		// construct method responses
 		$this->config
 			->method('getValueInt')
@@ -67,7 +67,7 @@ class CalDavValidatePluginTest extends TestCase {
 		$this->expectException(Forbidden::class);
 		// test condition
 		$this->plugin->beforePut($this->request, $this->response);
-		
+
 	}
 
 }
diff --git a/apps/dav/tests/unit/CalDAV/WebcalCaching/ConnectionTest.php b/apps/dav/tests/unit/CalDAV/WebcalCaching/ConnectionTest.php
index 5e9caaaeb44..35afc4d7ca7 100644
--- a/apps/dav/tests/unit/CalDAV/WebcalCaching/ConnectionTest.php
+++ b/apps/dav/tests/unit/CalDAV/WebcalCaching/ConnectionTest.php
@@ -13,7 +13,6 @@ use OCP\Http\Client\IClientService;
 use OCP\Http\Client\IResponse;
 use OCP\Http\Client\LocalServerException;
 use OCP\IAppConfig;
-use OCP\IConfig;
 use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 
@@ -21,9 +20,9 @@ use Test\TestCase;
 
 class ConnectionTest extends TestCase {
 
-	private IClientService|MockObject $clientService;
-	private IConfig|MockObject $config;
-	private LoggerInterface|MockObject $logger;
+	private IClientService&MockObject $clientService;
+	private IAppConfig&MockObject $config;
+	private LoggerInterface&MockObject $logger;
 	private Connection $connection;
 
 	public function setUp(): void {
diff --git a/apps/dav/tests/unit/CalDAV/WebcalCaching/PluginTest.php b/apps/dav/tests/unit/CalDAV/WebcalCaching/PluginTest.php
index 82c03c5cf68..804af021d5a 100644
--- a/apps/dav/tests/unit/CalDAV/WebcalCaching/PluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/WebcalCaching/PluginTest.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 /**
  * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
diff --git a/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php b/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
index d65a99a15e0..3252322ccff 100644
--- a/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
@@ -20,10 +20,10 @@ use Sabre\VObject\Recur\NoInstancesException;
 use Test\TestCase;
 
 class RefreshWebcalServiceTest extends TestCase {
-	private CalDavBackend|MockObject $caldavBackend;
-	private Connection|MockObject $connection;
-	private LoggerInterface|MockObject $logger;
-	private ITimeFactory|MockObject $time;
+	private CalDavBackend&MockObject $caldavBackend;
+	private Connection&MockObject $connection;
+	private LoggerInterface&MockObject $logger;
+	private ITimeFactory&MockObject $time;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -35,10 +35,6 @@ class RefreshWebcalServiceTest extends TestCase {
 	}
 
 	/**
-	 * @param string $body
-	 * @param string $contentType
-	 * @param string $result
-	 *
 	 * @dataProvider runDataProvider
 	 */
 	public function testRun(string $body, string $contentType, string $result): void {
@@ -88,10 +84,6 @@ class RefreshWebcalServiceTest extends TestCase {
 	}
 
 	/**
-	 * @param string $body
-	 * @param string $contentType
-	 * @param string $result
-	 *
 	 * @dataProvider identicalDataProvider
 	 */
 	public function testRunIdentical(string $uid, array $calendarObject, string $body, string $contentType, string $result): void {
@@ -209,10 +201,6 @@ class RefreshWebcalServiceTest extends TestCase {
 	}
 
 	/**
-	 * @param string $body
-	 * @param string $contentType
-	 * @param string $result
-	 *
 	 * @dataProvider runDataProvider
 	 */
 	public function testRunCreateCalendarNoException(string $body, string $contentType, string $result): void {
@@ -259,10 +247,6 @@ class RefreshWebcalServiceTest extends TestCase {
 	}
 
 	/**
-	 * @param string $body
-	 * @param string $contentType
-	 * @param string $result
-	 *
 	 * @dataProvider runDataProvider
 	 */
 	public function testRunCreateCalendarBadRequest(string $body, string $contentType, string $result): void {
@@ -308,10 +292,7 @@ class RefreshWebcalServiceTest extends TestCase {
 		$refreshWebcalService->refreshSubscription('principals/users/testuser', 'sub123');
 	}
 
-	/**
-	 * @return array
-	 */
-	public static function identicalDataProvider():array {
+	public static function identicalDataProvider(): array {
 		return [
 			[
 				'12345',
@@ -330,10 +311,7 @@ class RefreshWebcalServiceTest extends TestCase {
 		];
 	}
 
-	/**
-	 * @return array
-	 */
-	public function runDataProvider():array {
+	public static function runDataProvider(): array {
 		return [
 			[
 				"BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nCALSCALE:GREGORIAN\r\nBEGIN:VEVENT\r\nUID:12345\r\nDTSTAMP:20160218T133704Z\r\nDTSTART;VALUE=DATE:19000101\r\nDTEND;VALUE=DATE:19000102\r\nRRULE:FREQ=YEARLY\r\nSUMMARY:12345's Birthday (1900)\r\nTRANSP:TRANSPARENT\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n",
diff --git a/apps/dav/tests/unit/Upload/AssemblyStreamTest.php b/apps/dav/tests/unit/Upload/AssemblyStreamTest.php
index 854d02bfc10..e0bc3c589bc 100644
--- a/apps/dav/tests/unit/Upload/AssemblyStreamTest.php
+++ b/apps/dav/tests/unit/Upload/AssemblyStreamTest.php
@@ -15,7 +15,11 @@ class AssemblyStreamTest extends \Test\TestCase {
 	/**
 	 * @dataProvider providesNodes()
 	 */
-	public function testGetContents($expected, $nodes): void {
+	public function testGetContents(string $expected, array $nodeData): void {
+		$nodes = [];
+		foreach ($nodeData as $data) {
+			$nodes[] = $this->buildNode(...$data);
+		}
 		$stream = AssemblyStream::wrap($nodes);
 		$content = stream_get_contents($stream);
 
@@ -25,7 +29,11 @@ class AssemblyStreamTest extends \Test\TestCase {
 	/**
 	 * @dataProvider providesNodes()
 	 */
-	public function testGetContentsFread($expected, $nodes, $chunkLength = 3): void {
+	public function testGetContentsFread(string $expected, array $nodeData, int $chunkLength = 3): void {
+		$nodes = [];
+		foreach ($nodeData as $data) {
+			$nodes[] = $this->buildNode(...$data);
+		}
 		$stream = AssemblyStream::wrap($nodes);
 
 		$content = '';
@@ -43,7 +51,12 @@ class AssemblyStreamTest extends \Test\TestCase {
 	/**
 	 * @dataProvider providesNodes()
 	 */
-	public function testSeek($expected, $nodes): void {
+	public function testSeek(string $expected, array $nodeData): void {
+		$nodes = [];
+		foreach ($nodeData as $data) {
+			$nodes[] = $this->buildNode(...$data);
+		}
+
 		$stream = AssemblyStream::wrap($nodes);
 
 		$offset = floor(strlen($expected) * 0.6);
@@ -55,75 +68,75 @@ class AssemblyStreamTest extends \Test\TestCase {
 		$this->assertEquals(substr($expected, $offset), $content);
 	}
 
-	public function providesNodes() {
-		$data8k = $this->makeData(8192);
-		$dataLess8k = $this->makeData(8191);
+	public static function providesNodes(): array {
+		$data8k = self::makeData(8192);
+		$dataLess8k = self::makeData(8191);
 
 		$tonofnodes = [];
 		$tonofdata = '';
 		for ($i = 0; $i < 101; $i++) {
 			$thisdata = random_int(0, 100); // variable length and content
 			$tonofdata .= $thisdata;
-			$tonofnodes[] = $this->buildNode((string)$i, (string)$thisdata);
+			$tonofnodes[] = [(string)$i, (string)$thisdata];
 		}
 
 		return[
 			'one node zero bytes' => [
 				'', [
-					$this->buildNode('0', '')
+					['0', ''],
 				]],
 			'one node only' => [
 				'1234567890', [
-					$this->buildNode('0', '1234567890')
+					['0', '1234567890'],
 				]],
 			'one node buffer boundary' => [
 				$data8k, [
-					$this->buildNode('0', $data8k)
+					['0', $data8k],
 				]],
 			'two nodes' => [
 				'1234567890', [
-					$this->buildNode('1', '67890'),
-					$this->buildNode('0', '12345')
+					['1', '67890'],
+					['0', '12345'],
 				]],
 			'two nodes end on buffer boundary' => [
 				$data8k . $data8k, [
-					$this->buildNode('1', $data8k),
-					$this->buildNode('0', $data8k)
+					['1', $data8k],
+					['0', $data8k],
 				]],
 			'two nodes with one on buffer boundary' => [
 				$data8k . $dataLess8k, [
-					$this->buildNode('1', $dataLess8k),
-					$this->buildNode('0', $data8k)
+					['1', $dataLess8k],
+					['0', $data8k],
 				]],
 			'two nodes on buffer boundary plus one byte' => [
 				$data8k . 'X' . $data8k, [
-					$this->buildNode('1', $data8k),
-					$this->buildNode('0', $data8k . 'X')
+					['1', $data8k],
+					['0', $data8k . 'X'],
 				]],
 			'two nodes on buffer boundary plus one byte at the end' => [
 				$data8k . $data8k . 'X', [
-					$this->buildNode('1', $data8k . 'X'),
-					$this->buildNode('0', $data8k)
+					['1', $data8k . 'X'],
+					['0', $data8k],
 				]],
 			'a ton of nodes' => [
 				$tonofdata, $tonofnodes
 			],
 			'one read over multiple nodes' => [
 				'1234567890', [
-					$this->buildNode('0', '1234'),
-					$this->buildNode('1', '5678'),
-					$this->buildNode('2', '90'),
+					['0', '1234'],
+					['1', '5678'],
+					['2', '90'],
 				], 10],
 			'two reads over multiple nodes' => [
 				'1234567890', [
-					$this->buildNode('0', '1234'),
-					$this->buildNode('1', '5678'),
-					$this->buildNode('2', '90'),
+					['0', '1234'],
+					['1', '5678'],
+					['2', '90'],
 				], 5],
 		];
 	}
 
-	private function makeData($count) {
+	private static function makeData(int $count): string {
 		$data = '';
 		$base = '1234567890';
 		$j = 0;
@@ -137,10 +150,10 @@ class AssemblyStreamTest extends \Test\TestCase {
 		return $data;
 	}
 
-	private function buildNode($name, $data) {
+	private function buildNode(string $name, string $data) {
 		$node = $this->getMockBuilder(File::class)
-			->setMethods(['getName', 'get', 'getSize'])
-			->getMockForAbstractClass();
+			->onlyMethods(['getName', 'get', 'getSize'])
+			->getMock();
 
 		$node->expects($this->any())
 			->method('getName')