Create an agent installation package and install that on the systems.
On your new test box-
Create an installation package:
a Click Menu | Systems | System Tree. The System Tree page opens.
b Click System Tree Actions, then select New Systems from the drop-down menu.
c Select Create and download agent installation package.
d Deselect Use Credentials.
NOTE: If deselected, you receive the default package. If selected you can specify
e Click OK. The Download file dialog box opens.
f Select FramePkg.exe and save it to the desktop.
(p68 of the install guide)
You would need to consider how you deploy your current production agent and make sure that the test agent isn't overinstalled with the production agent.
You may have to uninstall the existing agent (or do a /forceinstall).