t: switch $_z40 to $ZERO_OID

diff --git a/t/t4002-diff-basic.sh b/t/t4002-diff-basic.sh
index a5e8b830834f4b5feb531f8f4f4d08462325b1de..5af773d6f7d6bda468e35dc32c49a81382fe8b8a 100755 (executable)
--- a/t/t4002-diff-basic.sh
+++ b/t/t4002-diff-basic.sh
@@ -131,7 +131,7 @@ cmp_diff_files_output () {
     # object ID for the changed files because it wants you to look at the
     # filesystem.
     sed <"$2" >.test-tmp \
-       -e '/^:000000 /d;s/'$_x40'\( [MCRNDU][0-9]*\)   /'$_z40'\1      /' &&
+       -e '/^:000000 /d;s/'$_x40'\( [MCRNDU][0-9]*\)   /'$ZERO_OID'\1  /' &&
     test_cmp "$1" .test-tmp
 }