Added test-darts.cc.
Added test-darts.cc.

xen/darts-clone,pombredanne/darts-clone,wells-xu/darts-clone,aminorex/darts-clone,demonshir/darts-clone,demonshir/darts-clone,hoganfan/darts-clone,wells-xu/darts-clone,chenkovsky/darts-clone,aminorex/darts-clone,hoganfan/darts-clone,pombredanne/darts-clone,xen/darts-clone,allenluce/darts-clone,allenluce/darts-clone,chenkovsky/darts-clone