And yet...

I would be very displeased with a submissive who tested me.

Would you not admonish a dominant who tested his sub's ability to take a beating rather than judge/evaluate/learn that perfect moment where his or her body is ready to respond to a beating orgasmically?

Would you not admonish a dominant who tested his submissive by trying to force them to use their safeword?

Would you not admonish a dominant who tested and then intentionally passed the boundary between humiliation and degradation just for the experimental nature of it (for what is testing but an experiment?)

IMO if you want more from your dominant or submissive, that's what 'tween-play conversations are for. The negotiations that occur in all relationships as boundaries require adjustments, as time spent together (and how it is spent together) is increased or decreased, as new (or old) activities are (re)explored.

Testing is, (again, my opinion,) tantamount to doubting.