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diff --git a/tests/test-setenv.c b/tests/test-setenv.c
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+/* Tests of setenv.
+ Copyright (C) 2009, 2010 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 <stdlib.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (setenv, int, (char const *, char const *, int));
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+ /* Test overwriting. */
+ ASSERT (setenv ("a", "==", -1) == 0);
+ ASSERT (setenv ("a", "2", 0) == 0);
+ ASSERT (strcmp (getenv ("a"), "==") == 0);
+
+ /* Required to fail with EINVAL. */
+ errno = 0;
+ ASSERT (setenv ("", "", 1) == -1);
+ ASSERT (errno == EINVAL);
+ errno = 0;
+ ASSERT (setenv ("a=b", "", 0) == -1);
+ ASSERT (errno == EINVAL);
+#if 0
+ /* glibc and gnulib's implementation guarantee this, but POSIX no
+ longer requires it: http://austingroupbugs.net/view.php?id=185 */
+ errno = 0;
+ ASSERT (setenv (NULL, "", 0) == -1);
+ ASSERT (errno == EINVAL);
+#endif
+
+ return 0;
+}