Support test-bundled-gems task on ruby core repository

hsbt · hsbt · commit eb2e34792e2d · 2017-11-15T10:23:42.000-06:00
diff --git a/test/helper.rb b/test/helper.rb
@@ -26,7 +26,7 @@ class TaskManager
     include Rake::TaskManager
   end
 
-  RUBY = Gem.ruby
+  RUBY = ENV['BUNDLE_RUBY'] || Gem.ruby
 
   def setup
     ARGV.clear
