test: libremessages: check that setup_traps leaves stdout alone

Everything should be on stderr.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/lib-messages-test.sh b/test/lib-messages-test.sh
index be6fb0f..3068a98 100644
--- a/test/lib-messages-test.sh
+++ b/test/lib-messages-test.sh
@@ -53,3 +53,11 @@ it_allows_subheadings_to_flag() {
 	       '  -c            cdesc' > $tmpdir/exp
 	diff -u $tmpdir/exp $tmpdir/out
 }
+
+it_is_quiet_on_stdout_on_errs() {
+	LC_ALL=C bash -euE -c '. libremessages; setup_traps; false' >"$tmpdir/stdout" 2>"$tmpdir/stderr" || stat=$?
+
+	[[ $stat != 0 ]]
+	empty "$tmpdir/stdout"
+	grep '==> ERROR:' "$tmpdir/stderr"
+}