Update HDASerializer test to validate copied_from_history_dataset_association_id with assertNullableEncodedId

Author: arash77

test/unit/app/managers/test_HDAManager.py

@@ -412,7 +412,7 @@ def test_serializers(self):
         assert isinstance(serialized["file_size"], int)
         assert isinstance(serialized["nice_size"], str)
         # TODO: these should be tested w/copy
-        assert isinstance(serialized["copied_from_history_dataset_association_id"], int)
+        self.assertNullableEncodedId(serialized["copied_from_history_dataset_association_id"])
         self.assertNullableEncodedId(serialized["copied_from_library_dataset_dataset_association_id"])
         self.assertNullableBasestring(serialized["info"])
         self.assertNullableBasestring(serialized["blurb"])