Remember: everything GLaDOS says is made up.

(You wake up in a cold glass walled room that's within a larger white walled with nothing but a toilet, bed and radio playing some preppy upbeat music, then suddenly you hear a seemingly pre-recorded voice message of a monotone robotic voice) "Hello and, again, welcome to the Aperture Science computer-aided enrichment center. We hope your brief detention in the relaxation vault has been a pleasant one. Your specimen has been processed and we are now ready to begin the test proper."