add a test for flatMap when passing a funtion
add a test for flatMap when passing a funtion

Noobish1/BrightFutures,morizotter/BrightFutures,morizotter/BrightFutures,Thomvis/BrightFutures,MattesGroeger/BrightFutures,zhaar/BrightFutures,tranhieutt/BrightFutures,zenkimoto/BrightFutures,MattesGroeger/BrightFutures,zhaar/BrightFutures,tranhieutt/BrightFutures,hoanganh6491/BrightFutures,zenkimoto/BrightFutures,Noobish1/BrightFutures,Thomvis/BrightFutures,hoanganh6491/BrightFutures