2003 kia Sorento starter

Question by Debbie Anderson posted 11 months 2 weeks ago in Kia

I may have left keys in auxiliary position. After 30 minutes car wouldn't start. Had it jumped then drove it for 30 minutes. Took to Autozone and they tested battery which was good. Then had me start vehicle checked starter with machine and said starter is bad. Is that how a starter is checked ?COuld they be wrong ?