The original testing and calibration of the adaptive optics system at the MMT Observatory was done with a large scale telescope simulator. This allowed testing the entire system in closed loop, including the adaptive secondary and the wavefront sensor optics. This was an effective way to perform the initial development and calibration of the system, but it is impractical to maintain such a large system for routine calibration of the adaptive secondary. Since it is a convex asphere, it cannot be tested with simple methods such as placing a point source at the center of curvature. The MMT AO Test Stand is a compact system that allows testing the convex aspheric secondary. It can be used to update the calibration of the thin shell secondary mirror as well as allowing development of new capabilities such as higher performance control loops and chopping. The test stand is small enough to fit in the clean room used for routine mirror storage and maintenance. Design, alignment, and testing results are presented.