--- /dev/null
+/* Test of getting the boot time.
+ Copyright (C) 2023 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 <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
+
+#include <config.h>
+
+#include "boot-time.h"
+
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+ struct timespec boot_time;
+ ASSERT (get_boot_time (&boot_time) == 0);
+
+ time_t tim = boot_time.tv_sec;
+ struct tm *gmt = gmtime (&tim);
+ ASSERT (gmt != NULL);
+ char timbuf[100];
+ ASSERT (strftime (timbuf, sizeof (timbuf), "%Y-%m-%d %H:%M:%S", gmt) > 0);
+
+ printf ("Boot time (UTC): %s.%09ld\n", timbuf, (long) boot_time.tv_nsec);
+
+ /* If the boot time is more than 5 years in the past or more than a week
+ in the future, the value must be wrong. */
+ time_t now = time (NULL);
+ ASSERT (tim >= now - 157680000);
+ ASSERT (tim <= now + 604800);
+
+ return 0;
+}