code_now_writing.rb

module HookPoints; end
using HookPoints

require 'super_storage_x'

class Target
  def testing_method
    SuperStorageX.store("x")
  end
end

Target.new.testing_method()

run_raw.rb

require 'code_now_testing'
# output "stored anywhare"

super_storage_x.rb

class SuperStorage
  def store(data)
    p "stored anywhere!"
  end
end

SuperStorageX = SuperStorage.new

test_code.rb

module HookPoints
  refine SuperStorage do
    def store(data)
      p "store hooked!"
    end
  end
end

require 'code_now_testing'
# output "store hooked!"