diff --git a/tests/unit/gapic/optimization_v1/test_fleet_routing.py b/tests/unit/gapic/optimization_v1/test_fleet_routing.py
index 9530558..dbc8721 100644
--- a/tests/unit/gapic/optimization_v1/test_fleet_routing.py
+++ b/tests/unit/gapic/optimization_v1/test_fleet_routing.py
@@ -18,8 +18,8 @@
 # try/except added for compatibility with python < 3.8
 try:
     from unittest import mock
-    from unittest.mock import AsyncMock
-except ImportError:
+    from unittest.mock import AsyncMock  # pragma: NO COVER
+except ImportError:  # pragma: NO COVER
     import mock
 
 import grpc