Write unit test for gen_argument_type
Write unit test for gen_argument_type

kumagi/jubatus_core,Asuka52/jubatus,roselleebarle04/jubatus,gintenlabo/jubatus_core,kmaehashi/jubatus_core,jubatus/jubatus,rimms/jubatus,gintenlabo/jubatus_core,kumagi/jubatus_core,Asuka52/jubatus,rimms/jubatus_core,rimms/jubatus_core,kumagi/jubatus_core,kmaehashi/jubatus,mathn/jubatus,kmaehashi/jubatus_core,gintenlabo/jubatus,rimms/jubatus_core,kmaehashi/jubatus_core,kumagi/jubatus_core,elkingtonmcb/jubatus,jubatus/jubatus,gintenlabo/jubatus_core,gintenlabo/jubatus_core,jubatus/jubatus,kmaehashi/jubatus,rimms/jubatus_core,elkingtonmcb/jubatus,gintenlabo/jubatus,rimms/jubatus,kmaehashi/jubatus_core,mathn/jubatus,roselleebarle04/jubatus