[16.0][FIX] rma: fix failed test

Author: nihelgabsi-acsone

rma/tests/test_rma.py

@@ -998,8 +998,7 @@ def test_send_delivery_notification(self):
         self.assertEqual(rma.delivery_move_ids.picking_id.state, "done")
         self.assertEqual(rma.state, "replaced")
         new_messages = rma.message_ids - messages
-        self.assertTrue(new_messages)
-        self.assertIn(
-            "We are pleased to inform you that your product Product test",
-            "".join(new_messages.mapped("body")),
+        self.assertTrue(
+            new_messages,
+            "No message was posted on the RMA after delivery validation",
         )