# File lib/fakefs/spec_helpers.rb, line 36
  def use_fakefs(describe_block, opts)
    describe_block.before opts[:with] do
      FakeFS.activate!
    end

    describe_block.after opts[:with] do
      FakeFS.deactivate!
      FakeFS::FileSystem.clear if opts[:with] == :each
    end
  end