>From f00b47ec1a696fb0757436e9228d2b44881cd70f Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Tue, 5 Nov 2024 21:12:11 +0100
Subject: [PATCH 22/23] wmemchr tests: Verify N3322 functionality.

* tests/test-wmemchr.c: New file.
* modules/wmemchr-tests: New file.
---
 ChangeLog             |  6 ++++++
 modules/wmemchr-tests | 11 +++++++++++
 tests/test-wmemchr.c  | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)
 create mode 100644 modules/wmemchr-tests
 create mode 100644 tests/test-wmemchr.c

diff --git a/ChangeLog b/ChangeLog
index 6945b84e9e..3ab7003b76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2024-11-05  Bruno Haible  <bruno@clisp.org>
+
+	wmemchr tests: Verify N3322 functionality.
+	* tests/test-wmemchr.c: New file.
+	* modules/wmemchr-tests: New file.
+
 2024-11-05  Bruno Haible  <bruno@clisp.org>
 
 	wmemcmp tests: Verify N3322 functionality.
diff --git a/modules/wmemchr-tests b/modules/wmemchr-tests
new file mode 100644
index 0000000000..f1de54d296
--- /dev/null
+++ b/modules/wmemchr-tests
@@ -0,0 +1,11 @@
+Files:
+tests/test-wmemchr.c
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-wmemchr
+check_PROGRAMS += test-wmemchr
diff --git a/tests/test-wmemchr.c b/tests/test-wmemchr.c
new file mode 100644
index 0000000000..3068eb983d
--- /dev/null
+++ b/tests/test-wmemchr.c
@@ -0,0 +1,37 @@
+/* Test of wmemchr() function.
+   Copyright (C) 2024 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/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <wchar.h>
+
+#include <stddef.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  /* Test zero-length operations on NULL pointers, allowed by
+     <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.  */
+  {
+    int volatile value = (wmemchr (NULL, L'?', 0) == NULL);
+    ASSERT (value);
+  }
+
+  return test_exit_status;
+}
-- 
2.34.1