completion: add comment for test_completion()

diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh
index e4f9da8536556eb9b0711d85ba411877fbc31c7e..0b521057283bf106da8ce55f25f61c7ec7e3ad35 100755 (executable)
--- a/t/t3412-rebase-root.sh
+++ b/t/t3412-rebase-root.sh
@@ -22,6 +22,11 @@ test_expect_success 'prepare repository' '
        test_commit 4 B
 '
 
+test_expect_success 'rebase --root fails with too many args' '
+       git checkout -B fail other &&
+       test_must_fail git rebase --onto master --root fail fail
+'
+
 test_expect_success 'setup pre-rebase hook' '
        mkdir -p .git/hooks &&
        cat >.git/hooks/pre-rebase <<EOF &&
@@ -38,7 +43,7 @@ cat > expect <<EOF
 EOF
 
 test_expect_success 'rebase --root --onto <newbase>' '
-       git checkout -b work &&
+       git checkout -b work other &&
        git rebase --root --onto master &&
        git log --pretty=tformat:"%s" > rebased &&
        test_cmp expect rebased