git merge --no-verify-signatures $(cat forged.commit)
'
+test_expect_success GPG 'merge unsigned commit into unborn branch' '
+ test_when_finished "git checkout initial" &&
+ git checkout --orphan unborn &&
+ test_must_fail git merge --verify-signatures side-unsigned 2>mergeerror &&
+ test_i18ngrep "does not have a GPG signature" mergeerror
+'
+
test_done