Oh my Python 2

tests/functional/test_new_resolver.py

@@ -1267,7 +1267,7 @@ def test_new_resolver_lazy_fetch_candidates(script, upgrade):
         "--no-cache-dir", "--no-index",
         "--find-links", script.scratch_path,
         "myuberpkg",
-        *pip_upgrade_args,
+        *pip_upgrade_args  # Trailing comma fails on Python 2.
     )
 
     # pip should install the version preferred by the strategy...