From: Mark Volkmann <r.mark.volkmann@...>
Date: 2006-03-24T23:12:16+09:00
Subject: Re: redirecting stdout to a String

On 3/24/06, James Edward Gray II <james@grayproductions.net> wrote:
> On Mar 24, 2006, at 7:50 AM, Mark Volkmann wrote:
>
> > I wrote a unit test for a method that writes to stdout. I got it to
> > work, but I'm not sure my approach was the best. Is there a more
> > recommended way to do this?
> >
> >     # Create a String with a singleton write method
> >     # that allows it to take the place of stdout.
> >     actual = '''
> >     def actual.write(data); self << data; end
>
> See the standard library, StringIO.

Thanks!  I have that working, but it's not clear to me how that is
better. In fact, it seems to take more code to do it that way. I now
have this.

  require 'stringio'

  sio = StringIO.new
  old_stdout, $stdout = $stdout, sio
  # Invoke method to test that writes to stdout.
  $stdout = old_stdout # restore stdout
  actual = sio.string

Am I overcomplicating this?

--
R. Mark Volkmann
Object Computing, Inc.