# File lib/fakefs/base.rb, line 8
  def self.activate!
    Object.class_eval do
      remove_const(:Dir)
      remove_const(:File)
      remove_const(:FileUtils)
      const_set(:Dir, FakeFS::Dir)
      const_set(:File, FakeFS::File)
      const_set(:FileUtils, FakeFS::FileUtils)
    end
  end