Extend tests for _spec_signature
Extend tests for _spec_signature

frankier/mock,OddBloke/mock,rbtcollins/mock,derwiki-adroll/mock,testing-cabal/mock,scorphus/mock,pypingou/mock,fladi/mock,kostyll/mock,sorenh/mock,lord63-forks/mock,dannybtran/mock,johndeng/mock,nett55/mock