Tweak string unit tests
Tweak string unit tests

mawww/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,alpha123/kakoune,alpha123/kakoune,danr/kakoune,jkonecny12/kakoune,mawww/kakoune,lenormf/kakoune,alpha123/kakoune,danr/kakoune,Asenar/kakoune,ekie/kakoune,occivink/kakoune,alexherbo2/kakoune,jjthrash/kakoune,casimir/kakoune,ekie/kakoune,lenormf/kakoune,jkonecny12/kakoune,danr/kakoune,jkonecny12/kakoune,ekie/kakoune,Asenar/kakoune,danr/kakoune,Somasis/kakoune,alexherbo2/kakoune,flavius/kakoune,Asenar/kakoune,casimir/kakoune,alpha123/kakoune,jjthrash/kakoune,lenormf/kakoune,lenormf/kakoune,Somasis/kakoune,occivink/kakoune,jjthrash/kakoune,mawww/kakoune,casimir/kakoune,ekie/kakoune,Somasis/kakoune,Somasis/kakoune,flavius/kakoune,jkonecny12/kakoune,casimir/kakoune,mawww/kakoune,flavius/kakoune,occivink/kakoune,jjthrash/kakoune,Asenar/kakoune,occivink/kakoune,flavius/kakoune