add ScalaTest to project and make cosmetic changes
add ScalaTest to project and make cosmetic changes

twitter/summingbird,rangadi/summingbird,nvoron23/summingbird,nkhuyu/summingbird,twitter/summingbird,nvoron23/summingbird,nkhuyu/summingbird,rangadi/summingbird,joychugh/summingbird,joychugh/summingbird,atomicjets/summingbird,atomicjets/summingbird