Add tests for all four StrictSlash cases
Add tests for all four StrictSlash cases

gopherlabs/gopher-providers-mux,muroachanf/mux,Arkan/mux,Manbeardo/mux,dvln/mux,jboelter/mux,buddhamagnet/mux,heetch/mux,outrightmental/go-mux,laohanlinux/mux,Vorstack/mux,studygolang/mux,matk86/mux,wfxiang08/mux,TramPamPam/mux,beyang/mux-clone,CedarLogic/mux,gorilla/mux,w4ngyi/mux,scriptoLLC/mux,coolljt0725/mux,kiip/mux,vonwenm/mux,pH14/mux,Gorilla/mux