Mini Evacuations
These are done when a NEW airline is in the process of certification. In order to have the aircraft certified the flight attendants and the airline must complet proving runs and a mini evacuation. This is done with non airline employees taking passenger seats and the CAA/FAA conducting an evacuation to see that the f/a's are able to evacuate all the passengers within 90 seconds or less. This is a very common term in the US.