Add some more unit tests for mergeConcat
Add some more unit tests for mergeConcat

arielshad/bodybuilder,evgenypoyarkov/bodybuilder,danpaz/bodybuilder,evgenypoyarkov/bodybuilder,node-packages/bodybuilder,npatmaja/bodybuilder,ShareIQ/bodybuilder,danpaz/bodybuilder,node-packages/bodybuilder,ShareIQ/bodybuilder,danpaz/bodybuilder,arielshad/bodybuilder,npatmaja/bodybuilder