1 files changed, 58 insertions, 0 deletions
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp
new file mode 100644
index 0000000..22cc63e
--- /dev/null
+++ b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+// <fstream>
+
+// class basic_filebuf;
+
+// native_handle_type native_handle() const noexcept;
+
+#include <cassert>
+#include <fstream>
+#include <filesystem>
+#include <utility>
+
+#include "platform_support.h"
+#include "test_macros.h"
+#include "../native_handle_test_helpers.h"
+
+template <typename CharT>
+void test() {
+  std::basic_filebuf<CharT> f;
+  std::filesystem::path p = get_temp_file_name();
+
+  // non-const
+  {
+    assert(f.open(p, std::ios_base::in) != nullptr);
+    std::same_as<NativeHandleT> decltype(auto) handle = f.native_handle();
+    assert(is_handle_valid(handle));
+    f.close();
+    assert(!is_handle_valid(handle));
+    static_assert(noexcept(f.native_handle()));
+  }
+  // const
+  {
+    assert(f.open(p, std::ios_base::in) != nullptr);
+    std::same_as<NativeHandleT> decltype(auto) const_handle = std::as_const(f).native_handle();
+    assert(is_handle_valid(const_handle));
+    f.close();
+    assert(!is_handle_valid(const_handle));
+    static_assert(noexcept(std::as_const(f).native_handle()));
+  }
+}
+
+int main(int, char**) {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+
+  return 0;
+}