From 6b0dc88eefdc3d79118aaba1ff8fd9a4e595c2ef Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Tue, 13 Jan 2026 15:44:22 +0200
Subject: [PATCH] Add test_to_chars_3.cpp

---
 test/Jamfile.v2          |  2 ++
 test/test_to_chars_3.cpp | 49 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 test/test_to_chars_3.cpp

diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index f2aa304..28fb0b8 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -120,6 +120,8 @@ run test_to_chars.cpp : : : <define>BOOST_UUID_NO_SIMD : test_to_chars_no_simd ;
 run test_to_chars_2.cpp ;
 run test_to_chars_2.cpp : : : <define>BOOST_UUID_NO_SIMD : test_to_chars_2_no_simd ;
 
+run test_to_chars_3.cpp ;
+
 run test_from_chars.cpp ;
 run test_from_chars.cpp : : : <define>BOOST_UUID_NO_SIMD : test_from_chars_no_simd ;
 run test_from_chars_2.cpp ;
diff --git a/test/test_to_chars_3.cpp b/test/test_to_chars_3.cpp
new file mode 100644
index 0000000..ee5df7c
--- /dev/null
+++ b/test/test_to_chars_3.cpp
@@ -0,0 +1,49 @@
+// Copyright 2026 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/uuid/uuid.hpp>
+#include <boost/uuid/uuid_io.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <string>
+#include <iterator>
+
+using namespace boost::uuids;
+
+template<class Ch> void test( uuid const& u, Ch const* expected )
+{
+    std::basic_string<Ch> str;
+
+    to_chars( u, std::back_inserter( str ) );
+
+    BOOST_TEST( str == expected );
+}
+
+int main()
+{
+    uuid const u1 = {{ 0 }};
+    uuid const u2 = {{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }};
+    uuid const u3 = {{ 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef }};
+
+    test( u1, "00000000-0000-0000-0000-000000000000" );
+    test( u2, "00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, "12345678-90ab-cdef-1234-567890abcdef" );
+
+    test( u1, L"00000000-0000-0000-0000-000000000000" );
+    test( u2, L"00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, L"12345678-90ab-cdef-1234-567890abcdef" );
+
+    test( u1, u"00000000-0000-0000-0000-000000000000" );
+    test( u2, u"00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, u"12345678-90ab-cdef-1234-567890abcdef" );
+
+    test( u1, U"00000000-0000-0000-0000-000000000000" );
+    test( u2, U"00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, U"12345678-90ab-cdef-1234-567890abcdef" );
+
+    test( u1, u8"00000000-0000-0000-0000-000000000000" );
+    test( u2, u8"00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, u8"12345678-90ab-cdef-1234-567890abcdef" );
+
+    return boost::report_errors();
+}