Clause 2 in the IOPLEX Software End User License Agreement reads:

"IOPLEX hereby grants to you a personal, non-exclusive, non-transferable license to install and use a single copy of the Software within a single instance of a computer operating system."

So, legally, you cannot use the same Jespa license key on the test server.

If the test environment is 25 users or less, you can use Jespa Free download. If it's more, you need to purchase another commercial license. Jespa resellers are more than happy to help you get this sorted.

The full EULA can be found in the zip file that you download from IOPLEX and also is displayed when you upload the zip file in the EasySSO config screen.