UiPath License for testing?

Hi guys, I have a question regarding the Enterprise UiPath licenses. Having read the documentation and the UiAcademy License Training, I am still confused about testing.
It is mentioned Nonproduction Robot licenses are the same as unattended but only used for non-production environments ie testing. But what about attended robots? What is the suitable license for attended robot testing? My scenario is what if we have a development and a testing team that is meant to work in parallel:
Is the development license for studio or a Attended Robot license more suitable for the testing team?
What if we needed standalone unattended robots without orchestrator to tests, what robot license do we need then?

Thank you in advanced!