Add unit test for DSBN
Add unit test for DSBN

lenovor/reweighted-ws,yanweifu/reweighted-ws,jbornschein/y2k,skaasj/reweighted-ws,lenovor/reweighted-ws,codeaudit/reweighted-ws,codeaudit/reweighted-ws,yanweifu/reweighted-ws,jbornschein/reweighted-ws,skaasj/reweighted-ws,jbornschein/y2k,jbornschein/reweighted-ws