Fix fallback base class when tests run without threading
diff --git a/Lib/packaging/tests/test_command_upload_docs.py b/Lib/packaging/tests/test_command_upload_docs.py
index 4070279..c00f5c1 100644
--- a/Lib/packaging/tests/test_command_upload_docs.py
+++ b/Lib/packaging/tests/test_command_upload_docs.py
@@ -19,7 +19,7 @@
from packaging.tests.pypi_server import PyPIServerTestCase
except ImportError:
threading = None
- PyPIServerTestCase = object
+ PyPIServerTestCase = unittest.TestCase
PYPIRC = """\