diff --git a/tests/test_object_serializer_disk.py b/tests/test_object_serializer_disk.py
index 5ce1e57901..2bc7e16937 100644
--- a/tests/test_object_serializer_disk.py
+++ b/tests/test_object_serializer_disk.py
@@ -113,28 +113,31 @@ def test_obj_serializer_disk_delete_on_startup(tmp_path: Path, mock_invoker_with
 
 
 def test_obj_serializer_disk_different_types(tmp_path: Path):
-    obj_serializer = ObjectSerializerDisk[MockDataclass](tmp_path)
-
+    obj_serializer_1 = ObjectSerializerDisk[MockDataclass](tmp_path)
     obj_1 = MockDataclass(foo="bar")
-    obj_1_name = obj_serializer.save(obj_1)
-    obj_1_loaded = obj_serializer.load(obj_1_name)
+    obj_1_name = obj_serializer_1.save(obj_1)
+    obj_1_loaded = obj_serializer_1.load(obj_1_name)
+    assert obj_serializer_1._obj_class_name == "MockDataclass"
     assert isinstance(obj_1_loaded, MockDataclass)
     assert obj_1_loaded.foo == "bar"
     assert obj_1_name.startswith("MockDataclass_")
 
-    obj_serializer = ObjectSerializerDisk[int](tmp_path)
-    obj_2_name = obj_serializer.save(9001)
-    assert obj_serializer.load(obj_2_name) == 9001
+    obj_serializer_2 = ObjectSerializerDisk[int](tmp_path)
+    obj_2_name = obj_serializer_2.save(9001)
+    assert obj_serializer_2._obj_class_name == "int"
+    assert obj_serializer_2.load(obj_2_name) == 9001
     assert obj_2_name.startswith("int_")
 
-    obj_serializer = ObjectSerializerDisk[str](tmp_path)
-    obj_3_name = obj_serializer.save("foo")
-    assert obj_serializer.load(obj_3_name) == "foo"
+    obj_serializer_3 = ObjectSerializerDisk[str](tmp_path)
+    obj_3_name = obj_serializer_3.save("foo")
+    assert obj_serializer_3._obj_class_name == "str"
+    assert obj_serializer_3.load(obj_3_name) == "foo"
     assert obj_3_name.startswith("str_")
 
-    obj_serializer = ObjectSerializerDisk[torch.Tensor](tmp_path)
-    obj_4_name = obj_serializer.save(torch.tensor([1, 2, 3]))
-    obj_4_loaded = obj_serializer.load(obj_4_name)
+    obj_serializer_4 = ObjectSerializerDisk[torch.Tensor](tmp_path)
+    obj_4_name = obj_serializer_4.save(torch.tensor([1, 2, 3]))
+    obj_4_loaded = obj_serializer_4.load(obj_4_name)
+    assert obj_serializer_4._obj_class_name == "Tensor"
     assert isinstance(obj_4_loaded, torch.Tensor)
     assert torch.equal(obj_4_loaded, torch.tensor([1, 2, 3]))
     assert obj_4_name.startswith("Tensor_")