Owie!! So sorry you got hurt Charlene. Although many of us have had a similar experience (or worse), it is not necessary to test the sharpness of the rotary cutter to be a quilter -- LOL.
When I first started quilting in the rotary era, I got a nick in the blade and ran my finger along the edge to see if I could feel anything (the same way I used to test the sharpness of knives) -- not my brightest moment. I do feel your pain.