add test for get skill by id
add test for get skill by id

phodal/skilltree,loki315zx/skilltree,phodal/skilltree,L-Jovi/skillock,liveangela/skilltree,phodal/skillock,L-Jovi/skillock,tzq668766/skilltree,liveangela/skilltree,tzq668766/skilltree,loki315zx/skilltree,phodal/skillock,iskilltree/skilltree,ivanyang1984/skillock,ivanyang1984/skillock,zhjlty/skillock,iskilltree/skilltree,zhjlty/skillock