$15-25k - undeveloped domain name to an end user.
I think it's too generic of a name for an end user to pay big bucks for it. I think a test preparation would much rather have TestPreparation.com or TestPrep.com, a blood test company would much prefer BloodTest.com, and a drug testing company would want DrugTesting.com or DrugTests.com. An actual "testing" company like the College Board (producers of the SAT) wouldn't want to brand Testing.com, as they would prefer to brand their SAT.com or CollegeBoard.com. This is just my opinion, and as full disclaimer, I offered $20k for the name since I wanted to develop it into a full website with areas for various types of testing. My goal was to build it into a fully-operational site, which would be sold based on the name + revenue multiple.