general improvements

diff --git a/t/t7009-filter-branch-null-sha1.sh b/t/t7009-filter-branch-null-sha1.sh
index a8d9ec498778b5a597fd5751f811c8bf0b0ab926..9ba9f24ad2fb4bd2c38a722e62577789fe36f09a 100755 (executable)
--- a/t/t7009-filter-branch-null-sha1.sh
+++ b/t/t7009-filter-branch-null-sha1.sh
@@ -12,7 +12,7 @@ test_expect_success 'setup: base commits' '
 test_expect_success 'setup: a commit with a bogus null sha1 in the tree' '
        {
                git ls-tree HEAD &&
-               printf "160000 commit $_z40\\tbroken\\n"
+               printf "160000 commit $ZERO_OID\\tbroken\\n"
        } >broken-tree &&
        echo "add broken entry" >msg &&