<checkout_cart_index>
    <reference name="checkout.cart">
        <block type="test/somblock" name="test.somblock" before="checkout.cart.totals" template="test/testing.phtml" />
        <block type="test/somblock" name="test.somblock" after="test.somblock" template="test/smtesting.phtml"/>      
    </reference>
</checkout_cart_index>

您要在购物车之前引用表格，但要在购物车中填写该表格.更改您的参考，然后将其添加到总计之前(或根据需要在折扣之前).

You are referring to the form before the cart, while you want it in the cart. Change your reference and add it before the totals (or before the discount if you like).