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_call.py b/Lib/test/test_call.py
index 529f15b..886bf18 100644
--- a/Lib/test/test_call.py
+++ b/Lib/test/test_call.py
@@ -122,4 +122,10 @@
     def test_oldargs1_2_kw(self):
         self.assertRaises(TypeError, {}.update, x=2, y=2)
 
-run_unittest(CFunctionCalls)
+
+def test_main():
+    run_unittest(CFunctionCalls)
+
+
+if __name__ == "__main__":
+    test_main()