Start of the Quest
"This next test involves "Aperture Science Material Wealth Incrementation Spheres". Based on its current data detailing your pathological compulsion to collect everything in sight, the Enrichment Center has every confidence in your success.
Collected spheres will only count towards the test when returned to this point." - GLaDOS upon approaching her.
End of the Quest
"Congratulations. You have successfully walked into and collected a number of inanimate objects of questionable value. Based on your current trajectory, you are only 3,440,398 tests away from becoming a qualified garbage collector." - GLaDOS upon finishing the quest
Collect 10 Aperture Science Material Wealth Incrementation Spheres.