An environment of your own, free for a week: simulated equipment, procedures ready to run. Nothing to install.
The problem
A 6U CubeSat goes from simulation to flatsat to flight model. Each step usually brings its own scripts, and the tests written early are rewritten later.
In five minutes
Define the topology of the satellite, then run the same functional acceptance in SIM, on the flatsat and on the flight model, over CSP on the RF link and on the CAN bus.