A "test loop" refers to repeatedly testing something to check if it is working correctly. It involves running a series of tests over and over again to make sure everything is functioning as expected. Full definition
The 1 km test loop was sufficient to understand the engine but too controlled an environment to discover much about the chassis and suspension set up. (overdrive.in)
Our web browsing test loops through a handful of moderately taxing web pages, and gives a good idea of how long a machine's battery hold out in typical casual use. (digitaltrends.com)
Our final test loops a video from local storage, and the Yoga 720 ran for nine hours and 57 minutes. (digitaltrends.com)