diff --git a/test/Jamfile b/test/Jamfile
index 560b2b9..1633aae 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -80,6 +80,7 @@ run append_integer_cx.cpp ;
 run append_character_cx.cpp ;
 run append_floating_point_cx.cpp ;
 run append_container_cx.cpp ;
+run append_string_cx.cpp ;
 
 # non-cryptographic
 
diff --git a/test/append_container.cpp b/test/append_container.cpp
index d794694..47c483c 100644
--- a/test/append_container.cpp
+++ b/test/append_container.cpp
@@ -1,4 +1,4 @@
-// Copyright 2017, 2024 Peter Dimov.
+// Copyright 2017, 2024 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
diff --git a/test/append_container_cx.cpp b/test/append_container_cx.cpp
index 5961277..691e9b5 100644
--- a/test/append_container_cx.cpp
+++ b/test/append_container_cx.cpp
@@ -1,4 +1,4 @@
-// Copyright 2017, 2024 Peter Dimov.
+// Copyright 2017, 2024 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
@@ -39,7 +39,6 @@ BOOST_CXX14_CONSTEXPR typename Hash::result_type test()
 
 #endif
 
-
 int main()
 {
     using namespace boost::hash2;
diff --git a/test/append_string.cpp b/test/append_string.cpp
index b3240f7..18e39d7 100644
--- a/test/append_string.cpp
+++ b/test/append_string.cpp
@@ -1,4 +1,4 @@
-// Copyright 2017, 2024 Peter Dimov.
+// Copyright 2017, 2024 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
diff --git a/test/append_string_cx.cpp b/test/append_string_cx.cpp
new file mode 100644
index 0000000..550fe14
--- /dev/null
+++ b/test/append_string_cx.cpp
@@ -0,0 +1,63 @@
+// Copyright 2017, 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/hash2/hash_append.hpp>
+#include <boost/hash2/fnv1a.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <string>
+#include <cstdint>
+
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1920
+# pragma warning(disable: 4307) // integral constant overflow
+#endif
+
+template<class Hash, class Flavor, class T>
+BOOST_CXX14_CONSTEXPR typename Hash::result_type test()
+{
+    unsigned char w[] = { 1, 2, 3, 4 };
+    std::basic_string<T> v( w, w + sizeof(w) / sizeof(w[0]) );
+
+    Hash h;
+    Flavor f{};
+
+    boost::hash2::hash_append( h, f, v );
+
+    return h.result();
+}
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+#if BOOST_CXX_VERSION < 202002L
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2)
+
+#else
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2); STATIC_ASSERT(x1 == x2)
+
+#endif
+
+int main()
+{
+    using namespace boost::hash2;
+
+    TEST_EQ( (test<fnv1a_32, little_endian_flavor, char>()), 2227238665 );
+    TEST_EQ( (test<fnv1a_32, big_endian_flavor, char>()), 3245468929 );
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+
+    TEST_EQ( (test<fnv1a_32, little_endian_flavor, char8_t>()), 2227238665 );
+    TEST_EQ( (test<fnv1a_32, big_endian_flavor, char8_t>()), 3245468929 );
+
+#endif
+
+    TEST_EQ( (test<fnv1a_32, little_endian_flavor, char16_t>()), 2981571797 );
+    TEST_EQ( (test<fnv1a_32, big_endian_flavor, char16_t>()), 1063054677 );
+
+    TEST_EQ( (test<fnv1a_32, little_endian_flavor, char32_t>()), 1745310485 );
+    TEST_EQ( (test<fnv1a_32, big_endian_flavor, char32_t>()), 3959736277 );
+
+    return boost::report_errors();
+}