bug#62578: 30.0.50; [PATCH] Add regression tests for synchronous processes in Eshell

[Eli Zaretskii]

> Date: Sat, 1 Apr 2023 17:58:59 -0700
> From: Jim Porter <jporterbugs@gmail.com>
> Cc: 62578@debbugs.gnu.org
> 
> On 4/1/2023 12:40 AM, Jim Porter wrote:
> > My only concern there is making Emacs do something reasonable when 
> > piping data into it, but I can just try a few things out, and if it 
> > really doesn't work, the existing tests in my patch are hopefully still 
> > better than nothing.
> 
> Ok, that wasn't too hard. How does this look?

LGTM, thanks.

One minor nit: 'message' in a batch session prints to stderr, not to
stdout.