test/helper.rb in slop-1.6.0 vs test/helper.rb in slop-1.6.1

@@ -2,9 +2,10 @@
   $:.unshift File.expand_path('../../lib', __FILE__)
   require 'slop'
 end
 
 require 'minitest/autorun'
+require 'stringio'
 
 begin
   require 'turn'
 rescue LoadError
 end
\ No newline at end of file