Our Rails app depends on another (running) Sinatra rack application. For testing purposes I would like to start this Sinatra app from within Rails. I tried to start it in the spec_helper and in a Rake task (with system("rackup"), but there seems to be conflicts ("shotgun is not part of the bundle", "uninitialized constant ActionController::Base (NameError)"). When starting it from bash directly then everything seems to work fine. How could I rackup the other rack app from within Rails?
Best regards, Kai