fix: update ads-templates test to verify query params in URL

Author: taimo3810

gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2

@@ -18,6 +18,8 @@ import grpc
 from grpc.experimental import aio
 {% if "rest" in opts.transport %}
 from collections.abc import Iterable
+import urllib.parse
+
 from google.protobuf import json_format
 import json
 {% endif %}
@@ -1451,8 +1453,12 @@ def test_{{ method_name }}_rest_required_fields(request_type={{ method.input.ide
                 ('$alt', 'json;enum-encoding=int')
               {% endif %}
             ]
-            actual_params = req.call_args.kwargs['params']
-            assert expected_params == actual_params
+            # Verify query params are correctly included in the URL
+            # Session.request is called as request(method, url, ...), so url is args[1]
+            actual_url = req.call_args.args[1]
+            parsed_url = urllib.parse.urlparse(actual_url)
+            actual_params = urllib.parse.parse_qsl(parsed_url.query, keep_blank_values=True)
+            assert set(expected_params).issubset(set(actual_params))
 
 
 def test_{{ method_name }}_rest_unset_required_fields():