fix bsd shell negation

diff --git a/t/t3406-rebase-message.sh b/t/t3406-rebase-message.sh
index 332b2b2feb6441e4fe34fe234c3c873ffbd0c81a..539108094345e3e0ba4cf03fc20a5ca6486fa230 100755 (executable)
--- a/t/t3406-rebase-message.sh
+++ b/t/t3406-rebase-message.sh
@@ -37,7 +37,7 @@ test_expect_success 'rebase -m' '
        git rebase -m master >report &&
        sed -n -e "/^Already applied: /p" \
                -e "/^Committed: /p" report >actual &&
-       diff -u expect actual
+       test_cmp expect actual
 
 '