fix session skip in test

Author: vchudnov-g

noxfile.py

@@ -255,8 +255,8 @@ def unit(session, install_grpc_gcp, install_grpc, install_async_rest):
 @nox.session(python=PYTHON_VERSIONS)
 def unit_protobuf_4x(session):
     """Run the unit test suite with protobuf 4.x."""
-    if session.python in ["3.9", "3.10", "3.11"]:
-        session.log("Skipping session: protobuf 4.x only runs on Python < 3.12")
+    if session.python not in ["3.9", "3.10", "3.11"]:
+        session.log(f"Skipping session for Python {session.python}")
         session.skip()
     # Pin protobuf to a 4.x version to ensure coverage for the legacy code path.
     session.install("protobuf>=4.25.8,<5.0.0")

tests/unit/operations_v1/test_operations_rest_client.py

@@ -356,7 +356,9 @@ def test_operations_client_client_options(
     options = client_options.ClientOptions(quota_project_id="octopus")
     with mock.patch.object(transport_class, "__init__") as patched:
         patched.return_value = None
-        client = client_class(client_options=options, transport=transport_name)  # pragma: NO COVER
+        client = client_class(
+            client_options=options, transport=transport_name
+        )  # pragma: NO COVER
         patched.assert_called_once_with(
             credentials=None,
             credentials_file=None,