Oh, that's so poignant. Poor things - so glad they have tasted a little bit of freedom at very long last.
Testing shouldn't be allowed on apes at all IMO. In fact I'd like to see a proper plan for moving away from animal testing entirely, but we could start by banning it on the most perceptive and socially expressive animals first. (Yes I do realise there are some instances where it's useful to us, but many experiments are unnecessary. Me-too drugs, for instance. Testing should only be allowed when absolutely necessary. Currently we have a system that assumes animal testing rather than attempting to limit it.