As per the update in magento for security patch SUPEE6788 as mentioned in [link][1]
[1]: http://magento.com/security/patches/supee-6788-technical-details i just change my config.xml from pervious code
<admin>
<routers>
<shipping>
<use>admin</use>
<args>
<module>Test_Shipping</module>
<frontName>shipping</frontName>
</args>
</shipping>
</routers>
</admin>
to
<admin>
<routers>
<adminhtml>
<args>
<modules>
<test_shipping after="Mage_Adminhtml">TestShipping_Adminhtml</test_shipping>
</modules>
</args>
</adminhtml>
</routers>
</admin>
but it did not work for me can anyone has solution for this issue.