t3419: stop losing return code of git command

Fix invocation of git command so its exit codes is not lost within
a non-assignment command substitution.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t3419-rebase-patch-id.sh b/t/t3419-rebase-patch-id.sh
index 49f548cdb93d53d88723adcd1f414a4db4c14a73..94552669ae87c9480afa004e2655729e9450d8e6 100755 (executable)
--- a/t/t3419-rebase-patch-id.sh
+++ b/t/t3419-rebase-patch-id.sh
@@ -80,7 +80,8 @@ do_tests () {
                git commit -q -m "change big file again" &&
                git checkout -q other^{} &&
                git rebase master &&
-               test_must_fail test -n "$(git rev-list master...HEAD~)"
+               git rev-list master...HEAD~ >revs &&
+               test_must_be_empty revs
        '
 
        test_expect_success $pr 'do not drop patch' '