Implement isUninitializedObject() in ObjectManagerDecorator

That method will be part of the ObjectManager interface in 4.0.x.

src/Persistence/ObjectManagerDecorator.php

@@ -82,6 +82,12 @@ public function initializeObject(object $obj)
         $this->wrapped->initializeObject($obj);
     }
 
+    /** @param mixed $value */
+    public function isUninitializedObject($value): bool
+    {
+        return $this->wrapped->isUninitializedObject($value);
+    }
+
     /**
      * {@inheritDoc}
      */

tests/Persistence/ObjectManagerDecoratorTest.php

@@ -155,6 +155,25 @@ public function testContains(): void
 
         self::assertTrue($this->decorated->contains($object));
     }
+
+    public function testIsUninitializedObject(): void
+    {
+        $object = new TestObject();
+
+        $wrapped   = $this->createMock(ObjectManagerV4::class);
+        $decorated = new NullObjectManagerDecorator($wrapped);
+        $wrapped->expects(self::once())
+            ->method('isUninitializedObject')
+            ->with($object)
+            ->willReturn(false);
+
+        self::assertFalse($decorated->isUninitializedObject($object));
+    }
+}
+
+interface ObjectManagerV4 extends ObjectManager
+{
+    public function isUninitializedObject(mixed $object): bool;
 }
 
 /** @extends ObjectManagerDecorator<ObjectManager&MockObject> */