I'll add a word of caution since you will probably work on the motor on your workbench.
Before testing for the first time, be sure to clamp the motor's base in a vise, or otherwise restrain it to the bench. If you don't, and the motor has vigorous starting torque, it may jump off the bench and injure you.
I learned this lesson the hard way some 65 years ago testing a John Deere starter motor that I had just replaced the brushes in. The motor (10-15 lbs. maybe?) was loose on a welding bench. Almost instantly after I touched the second jumper cable, the motor was on the floor (somewhat scaring me). Since then, I either use a vise or test motors on the floor.