Michael Haggerty <mhag...@alum.mit.edu> writes:

> This is the (slightly inconsistent) status quo; make sure it doesn't
> change by accident.

Interesting.  So "oldvalue" being empty is "we do not care what it
is" (as opposed to "we know it must not exist yet" aka 0{40}), and
"newvalue" being empty is the same as "delete it" aka 0{40}.

That is unfortunate, but I agree it is a good idea to add a test for
it, so that we will notice when we decide to fix it.

>
> Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
> ---
>  t/t1400-update-ref.sh | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
> index a2015d0..208f56e 100755
> --- a/t/t1400-update-ref.sh
> +++ b/t/t1400-update-ref.sh
> @@ -730,6 +730,13 @@ test_expect_success 'stdin -z fails update with bad ref 
> name' '
>       grep "fatal: invalid ref format: ~a" err
>  '
>  
> +test_expect_success 'stdin -z treats empty new value as zeros' '
> +     git update-ref $a $m &&
> +     printf $F "update $a" "" "" >stdin &&
> +     git update-ref -z --stdin <stdin &&
> +     test_must_fail git rev-parse --verify -q $a
> +'
> +
>  test_expect_success 'stdin -z fails update with no new value' '
>       printf $F "update $a" >stdin &&
>       test_must_fail git update-ref -z --stdin <stdin 2>err &&
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