diff --git a/tests/src/Core/Cache/CacheTest.php b/tests/src/Core/Cache/CacheTest.php
index 86bf5e7f0..e51ce745f 100644
--- a/tests/src/Core/Cache/CacheTest.php
+++ b/tests/src/Core/Cache/CacheTest.php
@@ -123,6 +123,8 @@ abstract class CacheTest extends DatabaseTest
 	 * @medium
 	 */
 	function testTTL() {
+		$this->markTestSkipped('taking too much time without mocking');
+
 		$this->assertNull($this->instance->get('value1'));
 
 		$value = 'foobar';
diff --git a/tests/src/Core/Lock/LockTest.php b/tests/src/Core/Lock/LockTest.php
index a7bbea265..78f2271e5 100644
--- a/tests/src/Core/Lock/LockTest.php
+++ b/tests/src/Core/Lock/LockTest.php
@@ -116,6 +116,8 @@ abstract class LockTest extends DatabaseTest
 	 * @medium
 	 */
 	function testLockTTL() {
+		$this->markTestSkipped('taking too much time without mocking');
+
 		$this->assertFalse($this->instance->isLocked('foo'));
 		$this->assertFalse($this->instance->isLocked('bar'));