[Toybox] [PATCH] tar.test: fix the tests when run as root.

[Rob Landley]

On 9/1/22 18:00, enh via Toybox wrote:
> Afaik, I'm the only person regularly running the toybox tests as
> root (in Android's CI), so I haven't actually fixed the character
> special and block special tests for macOS here --- I've fixed them
> so they work again on Android and Linux, and am just assuming we'll
> "skipnot" them on macOS. The first person to want to run the tests
> as root on macOS can fix this more thoroughly.
> 
> Also use a consistent group as well as user for the "ownership"
> test.
> 
> With this patch, the tests still pass on Linux and macOS but also
> pass as root on Android.

Sigh, I've got a bunch of local changes to that file.

Lemme try to merge this. I just tidied up and pushed my pending general test
infrastructure changes...

Rob