When making a will is the testatrix the witnesses?

Testatrix is the feminine form of the Word testator, the person who is giving property according to the provisions of the will-- the one who is creating the will. It is an infrequently used form. Aviatrix is an example, the feminine form of aviator. Mary the mother of Jesus is sometimes called the mediatrix of all grace in some religious traditions; mediatrix is feminine for mediator. I guess if we were still using this old form we would call a woman who is a senator a senatrix. Doesn't work very well.