[llvm-branch-commits] [libcxx] [libc++][TZDB] Adds local_info formatter. (PR #86256)

[Louis Dionne via llvm-branch-commits]

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@@ -0,0 +1,114 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+// UNSUPPORTED: no-localization
+
+// TODO FMT This test should not require std::to_chars(floating-point)
+// XFAIL: availability-fp_to_chars-missing
+
+// XFAIL: libcpp-has-no-incomplete-tzdb
+
+// <chrono>
+
+// template<class charT, class traits>
+//   basic_ostream<charT, traits>&
+//     operator<<(basic_ostream<charT, traits>& os, const local_info& r);
+
+// [time.zone.info.local]
+//   7 Effects: Streams out the local_info object r in an unspecified format.
+//   8 Returns: os.
+//
+// Tests the output produced by this function.
+
+#include <cassert>
+#include <chrono>
+#include <memory>
+#include <sstream>
+
+#include "assert_macros.h"
+#include "test_macros.h"
+#include "make_string.h"
+#include "concat_macros.h"
+
+#define SV(S) MAKE_STRING_VIEW(CharT, S)
+
+template <class CharT>
+static void test(std::basic_string_view<CharT> expected, std::chrono::local_info&& info) {
+  std::basic_stringstream<CharT> sstr;
+  sstr << info;
+  std::basic_string<CharT> output = sstr.str();
+
+  TEST_REQUIRE(expected == output,
+               TEST_WRITE_CONCATENATED("\nExpected output ", expected, "\nActual output   ", output, '\n'));
+}
+
+template <class CharT>
+static void test() {
+  using namespace std::literals::chrono_literals;
+  namespace tz = std::chrono;
+  // result values matching the "known" results
+  test(SV("unique: "
+          "{[-10484-10-16 15:30:08, 14423-03-17 15:30:07) 00:00:00 0min TZ, "
+          "[1970-01-01 00:00:00, 1970-01-01 00:00:00) 00:00:00 0min }"),
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ldionne wrote:

IMO formatting a `sys_info` without a time zone should not have a trailing whitespace, this looks like a small bug to  me.

https://github.com/llvm/llvm-project/pull/86256