t1400: test that stdin -z update treats empty <newvalue> as zeros

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

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index a2015d09773e8d63d7763106b50307eeb28a764a..208f56e5181fa57fc5dbf844d3287f1645741342 100755 (executable)
--- 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 &&