Use unittest.main() in 3.3 and greater
diff --git a/Lib/test/test_dictcomps.py b/Lib/test/test_dictcomps.py
index 5a19319..3c8b95c 100644
--- a/Lib/test/test_dictcomps.py
+++ b/Lib/test/test_dictcomps.py
@@ -84,8 +84,5 @@
                     "exec")
 
 
-def test_main():
-    support.run_unittest(__name__)
-
 if __name__ == "__main__":
-    test_main()
+    unittest.main()