--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2009-03-23  Eric Blake  <ebb9@byu.net>
 
+	signal-tests: test previous patch
+	* tests/test-signal.c: New file.
+	* modules/signal-tests: Likewise.
+
 	signal.h: always support 'volatile sig_atomic_t'
 	* m4/signal_h.m4 (gl_SIGNAL_H): Check for AIX limitation.
 	(gl_SIGNAL_H_DEFAULTS): Add a default.

new file mode 100644
--- /dev/null
+++ b/modules/signal-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-signal.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-signal
+check_PROGRAMS += test-signal
+
+License:
+LGPL

new file mode 100644
--- /dev/null
+++ b/tests/test-signal.c
@@ -0,0 +1,28 @@
+/* Test of <signal.h> substitute.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
+
+#include <config.h>
+
+#include <signal.h>
+
+volatile sig_atomic_t s;
+
+int main ()
+{
+  return s;
+}