Thanks Aaron for reply I write a gist for these cases, here you 
are https://gist.github.com/3694068

On Monday, September 10, 2012 8:26:23 PM UTC+4, Aaron Patterson wrote:
>
> On Mon, Sep 10, 2012 at 08:56:12AM -0700, Dmitry Vorotilin wrote: 
> > Guys I want to ask you about current realization of method capture. 
> There's 
> > a case in tests where I want to capture output in subprocess, current 
> > realization cannot do it because it doesn't reopen $std{out,err} and 
> just 
> > reassign this value. I think that's enough for many cases, do we need 
> > another realization in reporting.rb? Or I can just place it in the 
> tests. 
> > It related to https://github.com/rails/rails/pull/7586 
>
> Can you check to see if minitest's `capture_io` will solve the problem? 
>
>   
> https://github.com/seattlerb/minitest/blob/master/lib/minitest/unit.rb#L447-460
>  
>
> If not, can you write a small example (outside rails) to demonstrate the 
> problem?  This sounds like something we might want to push up to 
> minitest if possible. 
>
> -- 
> Aaron Patterson 
> http://tenderlovemaking.com/ 
>

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