Extend last change to cover TestSuites as well as TestCases.
diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index 0eb74c2..44d4b24 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -251,7 +251,7 @@
"""Run tests from unittest.TestCase-derived classes."""
suite = unittest.TestSuite()
for cls in classes:
- if isinstance(cls, unittest.TestCase):
+ if isinstance(cls, (unittest.TestSuite, unittest.TestCase)):
suite.addTest(cls)
else:
suite.addTest(unittest.makeSuite(cls))