A few of the kernel test commands use both files. I'll probably put up a pull for the remainder of those commands this week. My previous pr has a link to the current MRI docs for that command; we're still missing a few. 

-Erik Benoist

> On Oct 5, 2013, at 7:28 PM, Robert <notifications@github.com> wrote:
> 
> In kernel/common/kernel.rb:
> 
> > @@ -768,6 +768,12 @@ def test(cmd, file1, file2=nil)
> >        File.writable? file1
> >      when ?W
> >        File.writable_real? file1
> > +    when ?A
> > +      File.atime file1
> i wonder what file2 is for. it's never used.
> 
> —
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