add unit test for changes distribution bugfix
add unit test for changes distribution bugfix

KaiyonAlatar/eleven-server,Whizy/eleven-server,yelworc/eleven-server,ElevenGiants/eleven-server,KaiyonAlatar/eleven-server,reversefold/eleven-server,reversefold/eleven-server,Whizy/eleven-server,ElevenGiants/eleven-server,yelworc/eleven-server,Mexiswow/eleven-server,Mexiswow/eleven-server,KaiyonAlatar/eleven-server,Whizy/eleven-server,ElevenGiants/eleven-server