ruby-combustion 0.5.4-1 (s390x binary) in ubuntu xenial

 Ruby 'combustion' is a library to help you test your Rails Engines
 in a simple and effective manner, instead of creating a full Rails
 application in your spec or test folder.
 .
 It allows you to write your specs within the context of your engine,
 using only the parts of a Rails app you need.