1 files changed, 68 insertions, 0 deletions
diff --git a/libcxx/test/std/input.output/string.streams/stringstream.members/view.pass.cpp b/libcxx/test/std/input.output/string.streams/stringstream.members/view.pass.cpp
new file mode 100644
index 000000000000..f8f8a6567d7d
--- /dev/null
+++ b/libcxx/test/std/input.output/string.streams/stringstream.members/view.pass.cpp
@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_stringstream
+
+// 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_stringstream<CharT> ss(STR(" 123 456 "));
+  static_assert(noexcept(ss.view()));
+  assert(ss.view() == SV(" 123 456 "));
+  int i = 0;
+  ss >> i;
+  assert(i == 123);
+  ss >> i;
+  assert(i == 456);
+  ss << i << ' ' << 123;
+  assert(ss.view() == SV("456 1236 "));
+  ss.str(STR("5466 89 "));
+  ss >> i;
+  assert(i == 5466);
+  ss >> i;
+  assert(i == 89);
+  ss << i << ' ' << 321;
+  assert(ss.view() == SV("89 3219 "));
+
+  const std::basic_stringstream<CharT> css(STR("abc"));
+  static_assert(noexcept(css.view()));
+  assert(css.view() == SV("abc"));
+
+  std::basic_stringstream<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
+  std::stringstream ss;
+  ss.write("\xd1", 1);
+  assert(ss.view().length() == 1);
+  return 0;
+}