The SP Client Document Manager works fine in a testing environment. Just take the following steps when switching servers to migrate your site:
1. Login at www.smartypantsplugins.com
2. Click “Purchase History” on the top right
3. Find the appropriate purchase and click on “View Licenses”
4. Next to the correct item, click “Manage Sites”
5. Here you can remove the old URL and add the new URL to be licensed.