router: Add missing tests
router: Add missing tests

jjeffery/httprouter,julienschmidt/httprouter,cmars/tools,buaazp/fasthttprouter,glycerine/httprouter,yosssi/httprouter,herzog31/httprouter,agaurav/httprouter,cmars/tools,cmars/tools,laurennicoleroth/httprouter,hawx/route,cmars/tools,sdac/httprouter,TheHippo/httprouterc,kingland/httprouter,nigeldunn/httprouter,b54898533/httprouter,EricLagergren/httprouter,hiteshjoshi/httprouter,Pacoup/httprouter