gistfile1.rb

def capture_stdout(stdin_str = '')
  begin
    require 'stringio'
    $o_stdin, $o_stdout, $o_stderr = $stdin, $stdout, $stderr
    $stdin, $stdout, $stderr = StringIO.new(stdin_str), StringIO.new, StringIO.new
    yield
    {:stdout => $stdout.string, :stderr => $stderr.string}
  ensure
    $stdin, $stdout, $stderr = $o_stdin, $o_stdout, $o_stderr
  end
end

I sualy use this snippet: https://gist.github.com/988657

Looks like they're from the same place then http://rails-bestpractices.com/questions/1-test-stdin-stdout-in-rspec ;-)

Whoaaa!!! :P