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_dospath.py b/Lib/test/test_dospath.py
index 74bdd4a..3cca159 100644
--- a/Lib/test/test_dospath.py
+++ b/Lib/test/test_dospath.py
@@ -53,4 +53,9 @@
         self.assertEquals(splitdrive("c:"), ('c:', ''))
 
 
-test_support.run_unittest(DOSPathTestCase)
+def test_main():
+    test_support.run_unittest(DOSPathTestCase)
+
+
+if __name__ == "__main__":
+    test_main()