🖊️ more verbose asserts

Author: jvdd

tests/fr_selenium.py

@@ -136,7 +136,7 @@ def browser_independent_single_callback_request_assert(
             # There are 2 requests which are send
             # 1. first: changed-layout to server -> new data to back-end request
             # 2. the front-end relayout request
-            assert len(requests) >= 1
+            assert len(requests) >= 1, f"len(requests) = {len(requests)}"
             if len(requests) == 2:
                 fetch_data_request, relayout_request = requests
                 # RequestParser.assert_front_end_relayout_request(relayout_request)