There is a relationship that develops, tense and often testy, between a journalist and his quarry.
He was a testy clock-Nazi, the GOP was surprisingly well-briefed—and the outcome was never in doubt.
Meanawhile, there are headlines about Obama getting “testy” with reporter Brad Watson of WFAA in Dallas.
c.1500, "impetuous, rash," from Middle English testif "headstrong" (late 14c.), from Anglo-French testif, Old French testu "stubborn," literally "heady," from teste "head," from Late Latin testa "skull," in classical Latin "pot, shell" (see tester (n.2)). Meaning "easily irritated" is first recorded 1520s.