t5318: use test_oid for HASH_LEN

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index e0496da812f34df16ef7c3417788f9096ddc1e0f..024f8c06f7c58a424204d6fca69021ace2de3cbf 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -796,9 +796,8 @@ test_expect_success ':remotename and :remoteref' '
 '
 
 test_expect_success 'for-each-ref --ignore-case ignores case' '
-       >expect &&
        git for-each-ref --format="%(refname)" refs/heads/MASTER >actual &&
-       test_cmp expect actual &&
+       test_must_be_empty actual &&
 
        echo refs/heads/master >expect &&
        git for-each-ref --format="%(refname)" --ignore-case \