test: include unistd.h for _exit() used in ASSERT_SIGNAL()

Similar to c56e251d3f444b78e877eae27a0f82dcde5e9fe5.

diff --git a/src/shared/tests.h b/src/shared/tests.h
index 33304903ba14a7de19abbba26750f64d8473461b..5c933c48010ce4cac1776491bbd4275ff194b6b8 100644 (file)
--- a/src/shared/tests.h
+++ b/src/shared/tests.h
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <unistd.h>
+
 #include "errno-list.h"
 #include "errno-util.h"
 #include "forward.h"