Add ``if __name__ == '__main__'`` to some test files where it didn't take a lot
of effort to do so.
diff --git a/Lib/test/test_code.py b/Lib/test/test_code.py
index 4e68638..b69223d 100644
--- a/Lib/test/test_code.py
+++ b/Lib/test/test_code.py
@@ -100,3 +100,7 @@
     from test.test_support import run_doctest
     from test import test_code
     run_doctest(test_code, verbose)
+
+
+if __name__ == '__main__':
+    test_main()