diff --git a/tests/Doctrine/Tests/ORM/Proxy/ProxyFactoryTest.php b/tests/Doctrine/Tests/ORM/Proxy/ProxyFactoryTest.php
index 0207f72c2..feeb954a3 100644
--- a/tests/Doctrine/Tests/ORM/Proxy/ProxyFactoryTest.php
+++ b/tests/Doctrine/Tests/ORM/Proxy/ProxyFactoryTest.php
@@ -71,24 +71,27 @@ class ProxyFactoryTest extends \Doctrine\Tests\OrmTestCase
         $proxy->getDescription();
     }
 
-    public function testSkipMappedSuperClassesOnGeneration()
+    public function testSkipMappedSuperClassesOnGeneration(): void
     {
         $cm = new ClassMetadata(\stdClass::class);
         $cm->isMappedSuperclass = true;
 
         $num = $this->proxyFactory->generateProxyClasses([$cm]);
 
-        $this->assertEquals(0, $num, "No proxies generated.");
+        self::assertSame(0, $num, "No proxies generated.");
     }
 
-    public function testSkipEmbeddableClassesOnGeneration()
+    /**
+     * @group 6625
+     */
+    public function testSkipEmbeddableClassesOnGeneration(): void
     {
         $cm = new ClassMetadata(\stdClass::class);
         $cm->isEmbeddedClass = true;
 
         $num = $this->proxyFactory->generateProxyClasses([$cm]);
 
-        $this->assertEquals(0, $num, "No proxies generated.");
+        self::assertSame(0, $num, "No proxies generated.");
     }
 
     /**