Change the PyUnit-based tests to use the test_main() approach.  This
allows using the tests with unittest.py as a script.  The tests will
still run when run as a script themselves.
diff --git a/Lib/test/test_codeop.py b/Lib/test/test_codeop.py
index 7847fb3..fbe4a31 100644
--- a/Lib/test/test_codeop.py
+++ b/Lib/test/test_codeop.py
@@ -87,4 +87,10 @@
         self.assertNotEquals(compile_command("a = 1\n", "abc").co_filename,
                              compile("a = 1\n", "def", 'single').co_filename)
 
-run_unittest(CodeopTests)
+
+def test_main():
+    run_unittest(CodeopTests)
+
+
+if __name__ == "__main__":
+    test_main()