set_const

set_const is a (dangerous) gem that let you modify a constant’s value without any warning. It’s useful for testing purposes, for example when your code rely on a constant like ARGV or RUBY_PLATFORM.

gem install set_const

require 'set_const'

set_const('ARGV', %w[--foo bar])
set_const('RUBY_PLATFORM', 'Foobar')

$ git clone https://github.com/bfontaine/set_const.git
$ cd set_const
$ bundle install
$ bundle exec rake test