From: Robert Dober <robert.dober@...>
Date: 2006-08-06T16:47:38+09:00
Subject: Re: How to redirect a string to stdin within code?

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On 8/6/06, Alex Young <alex@blackkettle.org> wrote:
>
> Logan Capaldo wrote:
> >
> > On Aug 5, 2006, at 6:00 PM, Christian Seifert wrote:
> >
> >> Hello all, I am trying to create a unit test for a class that reads
> >> input from stdin (ie. the user enters his name when starting the
> >> class). I would like to write a unit test that provides the input  via
> >> a string. something like:
> >>
> >> input =3D "myname"
> >> $stdin =3D input
> >> start my class that I would like to test
> >>
> >> Any help is greatly appreciated.
> >>
> >> Christian
> >>
> >
> > require 'stringio'
> >
> > input =3D StringIO.new("myname")
> >
> > $stdin =3D input
> But:
>
> alex@pandora:~$ irb
> irb(main):001:0> require 'stringio'
> =3D> true
> irb(main):002:0> input =3D StringIO.new("myname")
> =3D> #<StringIO:0xb7a42864>
> irb(main):003:0> $stdin =3D input
> =3D> #<StringIO:0xb7a42864>
> /usr/lib/ruby/1.8/irb/input-method.rb:97: [BUG] Segmentation fault
> ruby 1.8.4 (2005-12-24) [i486-linux]
>
> Aborted
>
>
> This is on Ubuntu Breezy.  Any idea why that happens?


Very interesting I was just trying it on my Dapper  and I get  similar but
not identical behavior, see below.
However this seems an IRB issue Logans code just works fine in pure ruby

510/11 > irb
irb(main):001:0> require 'stringio'
=3D> true
irb(main):002:0> input =3D StringIO.new("myname")
=3D> #<StringIO:0xb7d2fe4c>
irb(main):003:0> $stdin =3D input
=3D> #<StringIO:0xb7d2fe4c>
irb(main):004:0> irb(main):004:0> NameError: undefined local variable or
method `myname' for main:Object
        from (irb):4
        from :0
irb(main):004:0> robert@:~/log/ruby/tests 09:43:16

and

510/12 > uname -a
Linux roma 2.6.15-19-386 #1 PREEMPT Mon Mar 20 16:46:02 UTC 2006 i686
GNU/Linux
robert@:~/log/ruby/tests 09:45:04
511/13 > ruby --version
ruby 1.8.4 (2005-12-24) [i686-linux]
robert@:~/log/ruby/tests 09:45:20
512/14 > irb --version
irb 0.9.5(05/04/13)
robert@:~/log/ruby/tes

Cheers
Robert

--
> Alex
>
>


--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

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