diff --git a/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php b/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
index a20cbc1..e107453 100644
--- a/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/ContentEntityDatabaseStorageTest.php
@@ -9,6 +9,8 @@
 
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Entity\ContentEntityDatabaseStorage;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Field\FieldDefinition;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -1104,7 +1106,12 @@ public function testLoadMultiplePersistentCached() {
 
     $key = 'values:' . $this->entityTypeId . ':1';
     $id = 1;
-    $entity = $this->getMock('Drupal\Core\Entity\EntityInterface');
+    $class_name = '\Drupal\Tests\Core\Entity\ContentEntityDatabaseStorageTestEntityInterface';
+    $methods = get_class_methods($class_name);
+    unset($methods[array_search('postLoad', $methods)]);
+    $entity = $this->getMockBuilder($class_name)
+      ->setMethods($methods)
+      ->getMock();
     $entity->expects($this->any())
       ->method('id')
       ->will($this->returnValue($id));
@@ -1143,7 +1150,12 @@ public function testLoadMultipleNoPersistentCache() {
     $this->setUpModuleHandlerNoImplementations();
 
     $id = 1;
-    $entity = $this->getMock('Drupal\Core\Entity\EntityInterface');
+    $class_name = '\Drupal\Tests\Core\Entity\ContentEntityDatabaseStorageTestEntityInterface';
+    $methods = get_class_methods($class_name);
+    unset($methods[array_search('postLoad', $methods)]);
+    $entity = $this->getMockBuilder($class_name)
+      ->setMethods($methods)
+      ->getMock();
     $entity->expects($this->any())
       ->method('id')
       ->will($this->returnValue($id));
@@ -1189,7 +1201,12 @@ public function testLoadMultiplePersistentCacheMiss() {
     $this->setUpModuleHandlerNoImplementations();
 
     $id = 1;
-    $entity = $this->getMock('Drupal\Core\Entity\EntityInterface');
+    $class_name = '\Drupal\Tests\Core\Entity\ContentEntityDatabaseStorageTestEntityInterface';
+    $methods = get_class_methods($class_name);
+    unset($methods[array_search('postLoad', $methods)]);
+    $entity = $this->getMockBuilder($class_name)
+      ->setMethods($methods)
+      ->getMock();
     $entity->expects($this->any())
       ->method('id')
       ->will($this->returnValue($id));
@@ -1244,3 +1261,16 @@ protected function setUpModuleHandlerNoImplementations() {
   }
 
 }
+
+/**
+ * Provides an entity with dummy implementations of static methods, because
+ * those cannot be mocked.
+ */
+abstract class ContentEntityDatabaseStorageTestEntityInterface implements EntityInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function postLoad(EntityStorageInterface $storage, array &$entities) {
+  }
+}