1 files changed, 60 insertions, 0 deletions
diff --git a/libcxx/test/std/input.output/string.streams/ostringstream/ostringstream.members/view.pass.cpp b/libcxx/test/std/input.output/string.streams/ostringstream/ostringstream.members/view.pass.cpp
new file mode 100644
index 000000000000..1dc691d0d11d
--- /dev/null
+++ b/libcxx/test/std/input.output/string.streams/ostringstream/ostringstream.members/view.pass.cpp
@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <sstream>
+
+// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+// class basic_ostringstream
+
+// basic_string_view<charT, traits> view() const noexcept;
+
+#include <sstream>
+#include <cassert>
+#include <type_traits>
+
+#include "make_string.h"
+#include "test_macros.h"
+
+#define STR(S) MAKE_STRING(CharT, S)
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT>
+struct my_char_traits : public std::char_traits<CharT> {};
+
+template <class CharT>
+static void test() {
+  std::basic_ostringstream<CharT> ss(STR(" 123 456"));
+  static_assert(noexcept(ss.view()));
+  assert(ss.view() == SV(" 123 456"));
+  int i = 0;
+  ss << i;
+  assert(ss.view() == SV("0123 456"));
+  ss << 456;
+  assert(ss.view() == SV("0456 456"));
+  ss.str(STR(" 789"));
+  assert(ss.view() == SV(" 789"));
+  ss << SV("abc");
+  assert(ss.view() == SV("abc9"));
+
+  const std::basic_ostringstream<CharT> css(STR("abc"));
+  static_assert(noexcept(css.view()));
+  assert(css.view() == SV("abc"));
+
+  std::basic_ostringstream<CharT, my_char_traits<CharT>> tss;
+  static_assert(std::is_same_v<decltype(tss.view()), std::basic_string_view<CharT, my_char_traits<CharT>>>);
+}
+
+int main(int, char**) {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+  return 0;
+}