Litmus Test is a three-year-old making a racecourse debut, which means nobody outside the yard has any real idea what to expect. That is part of what makes first-timers interesting — the form book is blank, and the horse is essentially an unknown quantity until the gates open. What we do know comes from the breeding. The sire, Nyquist, won the Kentucky Derby in 2016 and has built a solid reputation as a stallion who passes on speed and a competitive temperament. The dam's sire, Malibu Moon, is another American influence associated with sharp, early-maturing types who tend to show up ready to run. On paper, that combination points towards a horse who should have plenty of natural ability and the physical make-up to be competitive from the off — though breeding can only tell you so much.
The name, whether intentional or not, suits the moment perfectly. A litmus test reveals something's true nature quickly and decisively. That is exactly what a racecourse debut does.