diff --git a/apps/settings/tests/Settings/Admin/SharingTest.php b/apps/settings/tests/Settings/Admin/SharingTest.php
index 5fcc153b6dd..2309628868c 100644
--- a/apps/settings/tests/Settings/Admin/SharingTest.php
+++ b/apps/settings/tests/Settings/Admin/SharingTest.php
@@ -5,6 +5,7 @@
  */
 namespace OCA\Settings\Tests\Settings\Admin;
 
+use OC\Share20\Manager;
 use OCA\Settings\Settings\Admin\Sharing;
 use OCP\App\IAppManager;
 use OCP\AppFramework\Http\TemplateResponse;
@@ -13,7 +14,6 @@ use OCP\Constants;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IURLGenerator;
-use OCP\Share\IManager;
 use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
@@ -24,7 +24,7 @@ class SharingTest extends TestCase {
 	private $config;
 	/** @var IL10N&MockObject */
 	private $l10n;
-	/** @var IManager|MockObject */
+	/** @var Manager|MockObject */
 	private $shareManager;
 	/** @var IAppManager|MockObject */
 	private $appManager;
@@ -38,8 +38,8 @@ class SharingTest extends TestCase {
 		$this->config = $this->getMockBuilder(IConfig::class)->getMock();
 		$this->l10n = $this->getMockBuilder(IL10N::class)->getMock();
 
-		/** @var IManager|MockObject */
-		$this->shareManager = $this->getMockBuilder(IManager::class)->getMock();
+		/** @var Manager|MockObject */
+		$this->shareManager = $this->createMock(Manager::class);
 		/** @var IAppManager|MockObject */
 		$this->appManager = $this->getMockBuilder(IAppManager::class)->getMock();
 		/** @var IURLGenerator|MockObject */
diff --git a/tests/lib/Collaboration/Collaborators/UserPluginTest.php b/tests/lib/Collaboration/Collaborators/UserPluginTest.php
index 453f16c6686..35071ca96f9 100644
--- a/tests/lib/Collaboration/Collaborators/UserPluginTest.php
+++ b/tests/lib/Collaboration/Collaborators/UserPluginTest.php
@@ -456,6 +456,10 @@ class UserPluginTest extends TestCase {
 			->method('getUser')
 			->willReturn($this->user);
 
+		$this->userManager->expects($this->any())
+			->method('searchDisplayName')
+			->willReturn($userResponse);
+
 		if (!$shareWithGroupOnly) {
 			if ($shareeEnumerationPhone) {
 				$this->userManager->expects($this->once())
@@ -766,10 +770,10 @@ class UserPluginTest extends TestCase {
 			->willReturnCallback(function ($search) use ($matchingUsers) {
 				$users = array_filter(
 					$matchingUsers,
-					fn ($user) => str_contains(strtolower($user['displayName']), strtolower($search))
+					fn ($user) => str_contains(strtolower($user['displayName'] ?? $user['uid']), strtolower($search))
 				);
 				return array_map(
-					fn ($user) => $this->getUserMock($user['uid'], $user['displayName']),
+					fn ($user) => $this->getUserMock($user['uid'], $user['displayName'] ?? $user['uid']),
 					$users);
 			});