builtin/submodule--helper: factor out submodule updating

diff --git a/t/t4027-diff-submodule.sh b/t/t4027-diff-submodule.sh
index 2ffd11a142d8c1d2f532f662951a27a90119a76e..6304130ad4737bfac1e2cf06fd8c600bb7b42f76 100755 (executable)
--- a/t/t4027-diff-submodule.sh
+++ b/t/t4027-diff-submodule.sh
@@ -31,7 +31,7 @@ test_expect_success setup '
                cd sub &&
                git rev-list HEAD
        ) &&
-       echo ":160000 160000 $3 $_z40 M sub" >expect &&
+       echo ":160000 160000 $3 $ZERO_OID M     sub" >expect &&
        subtip=$3 subprev=$2
 '
 
@@ -250,7 +250,7 @@ test_expect_success 'conflicted submodule setup' '
        # 39 efs
        c=fffffffffffffffffffffffffffffffffffffff &&
        (
-               echo "000000 $_z40 0    sub" &&
+               echo "000000 $ZERO_OID 0        sub" &&
                echo "160000 1$c 1      sub" &&
                echo "160000 2$c 2      sub" &&
                echo "160000 3$c 3      sub"
@@ -265,7 +265,7 @@ index 2ffffff,3ffffff..0000000
 ++Subproject commit 0000000000000000000000000000000000000000'\'' &&
 
        hh=$(git rev-parse HEAD) &&
-       sed -e "s/$_z40/$hh/" expect.nosub >expect.withsub
+       sed -e "s/$ZERO_OID/$hh/" expect.nosub >expect.withsub
 
 '