Update various test modules to use unittest.main() for test discovery
instead of manually listing tests for test.support.run_unittest().
diff --git a/Lib/test/test_frozen.py b/Lib/test/test_frozen.py
index 624e321..4c50cb7 100644
--- a/Lib/test/test_frozen.py
+++ b/Lib/test/test_frozen.py
@@ -72,8 +72,6 @@
         del sys.modules['__phello__']
         del sys.modules['__phello__.spam']
 
-def test_main():
-    run_unittest(FrozenTests)
 
 if __name__ == "__main__":
-    test_main()
+    unittest.main()