test method interact test interact object model model model manag factori creat model object collab model collabor factori build collabor model object interact model collabor factori creat interact model collabor helper set context interact collab model collabor factori build interact collab equal model facad interact collab size model facad interact collab contain interact object msg model collabor factori creat messag msg model collabor helper add messag interact msg model facad messag interact contain msg model collabor helper remov interact collab interact equal model facad interact collab size 