ruby on rails - Should features from gems be tested inside applications using them? -

i working on rails 4 project. naturally there gems use add features application.

one of these gems pg_search gem.

i use add search scope user model.

class user < activerecord::base   include pgsearch    pg_search_scope :search,     against: [:email],     using: :tsearch end 

the internal workings of such scope tested within gem.

so question is, should feature tested within application well? , if how such test like?

testing gem bit insulting, gem has presumably been thoroughly tested developers/contributors. there nothing wrong, however, testing how gem's features work own code. excellent question though!