You would create a new repository with its own database. You can have multiple Laserfiche database on the same SQL instance, or you can put the test database on its own instance. If you are using directly assigned repository users you would need to allocate a couple named user licenses to the new repository, but if you are using LFDS directory or domain users (that is, users defined in the directory server or windows account users), the same license allocation will apply to all repositories in the system.