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diff --git a/include/o3tl/cppunittraitshelper.hxx b/include/o3tl/cppunittraitshelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_O3TL_CPPUNITTRAITSHELPER_HXX
+#define INCLUDED_O3TL_CPPUNITTRAITSHELPER_HXX
+
+#include <sal/config.h>
+
+#include <string>
+
+#include <cppunit/TestAssert.h>
+
+// ostream << char16_t is deleted since C++20 (but just keep outputting numeric values):
+template <> inline std::string CppUnit::assertion_traits<char16_t>::toString(char16_t const& x)
+{
+ return assertion_traits<unsigned>::toString(unsigned(x));
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */