put (one) through (one's) paces
To make one undergo a thorough testing or examination so as to evaluate one's worth, ability, or competence. We need someone who can begin handling complex projects right away, so we're going to put you through your paces during the assessment period, OK? The coach wanted to put the young boxer through her paces before he agreed to bring her on the Olympic team.
put someone or something through their paces
make someone or something demonstrate their qualities or abilities.