test model element contain test model element contain state machin factori factori model state machin factori state machin helper helper model state machin helper object state machin factori creat state machin object state factori creat simpl state object action model common behavior factori creat action helper set state machin state state machin helper set entri state action object parent composit model facad model element contain action state equal parent composit state machin equal model facad model element contain parent composit 