--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2010-11-28  Bruno Haible  <bruno@clisp.org>
+            Paul Eggert  <eggert@cs.ucla.edu>
+
+	Tests for module 'getdomainname'.
+	* modules/getdomainname-tests: New file.
+	* tests/test-getdomainname.c: New file, based on
+	tests/test-gethostname.c.
+
 2010-11-28  Bruno Haible  <bruno@clisp.org>
             Paul Eggert  <eggert@cs.ucla.edu>
 

new file mode 100644
--- /dev/null
+++ b/modules/getdomainname-tests
@@ -0,0 +1,11 @@
+Files:
+tests/signature.h
+tests/test-getdomainname.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-getdomainname
+check_PROGRAMS += test-getdomainname

new file mode 100644
--- /dev/null
+++ b/tests/test-getdomainname.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2008-2010 Free Software Foundation, Inc.
+ * Written by Simon Josefsson.
+ *
+ * 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/>.  */
+
+#include <config.h>
+
+/* Get getdomainname() declaration.  */
+#include <unistd.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getdomainname, int, (char *, size_t));
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#define YPMAXDOMAIN 64
+
+#define NODOMAINNAME "magic-gnulib-test-string"
+
+int
+main (int argc, char *argv[] _GL_UNUSED)
+{
+  char buf[YPMAXDOMAIN];
+  int rc;
+
+  if (strlen (NODOMAINNAME) >= YPMAXDOMAIN)
+    {
+      printf ("YPMAXDOMAIN impossibly small?! %d\n", YPMAXDOMAIN);
+      return 2;
+    }
+
+  strcpy (buf, NODOMAINNAME);
+
+  rc = getdomainname (buf, sizeof (buf));
+
+  if (rc != 0)
+    {
+      printf ("getdomainname failed, rc %d errno %d\n", rc, errno);
+      return 1;
+    }
+
+  if (strcmp (buf, NODOMAINNAME) == 0)
+    {
+      printf ("getdomainname left buffer untouched.\n");
+      return 1;
+    }
+
+  if (argc > 1)
+    printf ("domainname: %s\n", buf);
+
+  return 0;
+}