Can't run Sinatra Ruby file in RubyMine version 2.5

I am working with Sinatra, which provides me with a simple web app to use for Cucumber demonstrations. In RubyMine 2.0.2 I am able to right-click on the ruby file in the "Project" pane and a "Run" option appears in the drop-down menu. That option does not seem to appear in RubyMine 2.5 (RM-96.552).

I'm trying to remember if I had to select something special in order to run just any Ruby file in 2.0.2, but nothing is coming to mind.