// Formatting library for C++ - time formatting tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.

#include "fmt/chrono.h"

#include <time.h>

#include <vector>

#include "gtest-extra.h"  // EXPECT_THROW_MSG
#include "util.h"         // get_locale

using fmt::runtime;

using testing::Contains;

auto make_tm() -> std::tm {
  auto time = std::tm();
  time.tm_mday = 1;
  return time;
}

auto make_hour(int h) -> std::tm {
  auto time = make_tm();
  time.tm_hour = h;
  return time;
}

auto make_minute(int m) -> std::tm {
  auto time = make_tm();
  time.tm_min = m;
  return time;
}

auto make_second(int s) -> std::tm {
  auto time = make_tm();
  time.tm_sec = s;
  return time;
}

TEST(chrono_test, format_tm) {
  auto tm = std::tm();
  tm.tm_year = 116;
  tm.tm_mon = 3;
  tm.tm_mday = 25;
  tm.tm_hour = 11;
  tm.tm_min = 22;
  tm.tm_sec = 33;
  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
            "The date is 2016-04-25 11:22:33.");
  EXPECT_EQ(fmt::format("{:%Y}", tm), "2016");
  EXPECT_EQ(fmt::format("{:%C}", tm), "20");
  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
  EXPECT_EQ(fmt::format("{:%e}", tm), "25");
  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/16");
  EXPECT_EQ(fmt::format("{:%F}", tm), "2016-04-25");
  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");

  // Short year
  tm.tm_year = 999 - 1900;
  EXPECT_EQ(fmt::format("{:%Y}", tm), "0999");
  EXPECT_EQ(fmt::format("{:%G}", tm), "0998");

  // for week on the year
  // https://www.cl.cam.ac.uk/~mgk25/iso-time.html
  std::vector<std::string> str_tm_list = {
      "1975-12-29",  // W01
      "1977-01-02",  // W53
      "1999-12-27",  // W52
      "1999-12-31",  // W52
      "2000-01-01",  // W52
      "2000-01-02",  // W52
      "2000-01-03",  // W1
  };
  std::vector<std::string> spec_list = {"%G", "%g", "%V"};
  for (const auto& str_tm : str_tm_list) {
    tm = std::tm();

    // GCC 4 does not support std::get_time
    // MSVC dows not support POSIX strptime
#ifdef _WIN32
    std::istringstream ss(str_tm);
    ss >> std::get_time(&tm, "%Y-%m-%d");
#else
    strptime(str_tm.c_str(), "%Y-%m-%d", &tm);
#endif
    // Because std::get_time doesn't calculate tm_yday, tm_wday, etc.
    tm.tm_isdst = 0;
    auto t = std::mktime(&tm);
    tm = *std::localtime(&t);

    for (const auto& spec : spec_list) {
      char output[256] = {};
      std::strftime(output, sizeof(output), spec.c_str(), &tm);
      auto fmt_spec = std::string("{:").append(spec).append("}");
      EXPECT_EQ(output, fmt::format(fmt::runtime(fmt_spec), tm));
    }
  }
}

// MSVC:
//  minkernel\crts\ucrt\src\appcrt\time\wcsftime.cpp(971) : Assertion failed:
//  timeptr->tm_year >= -1900 && timeptr->tm_year <= 8099
#ifndef _WIN32
TEST(chrono_test, format_tm_future) {
  auto tm = std::tm();
  tm.tm_year = 10445;  // 10000+ years
  tm.tm_mon = 3;
  tm.tm_mday = 25;
  tm.tm_hour = 11;
  tm.tm_min = 22;
  tm.tm_sec = 33;
  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
            "The date is 12345-04-25 11:22:33.");
  EXPECT_EQ(fmt::format("{:%Y}", tm), "12345");
  EXPECT_EQ(fmt::format("{:%C}", tm), "123");
  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));
  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/45");
  EXPECT_EQ(fmt::format("{:%F}", tm), "12345-04-25");
  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
}

TEST(chrono_test, format_tm_past) {
  auto tm = std::tm();
  tm.tm_year = -2001;
  tm.tm_mon = 3;
  tm.tm_mday = 25;
  tm.tm_hour = 11;
  tm.tm_min = 22;
  tm.tm_sec = 33;
  EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
            "The date is -101-04-25 11:22:33.");
  EXPECT_EQ(fmt::format("{:%Y}", tm), "-101");

  // macOS  %C - "-1"
  // Linux  %C - "-2"
  // fmt    %C - "-1"
  EXPECT_EQ(fmt::format("{:%C}", tm), "-1");
  EXPECT_EQ(fmt::format("{:%C%y}", tm), fmt::format("{:%Y}", tm));

  // macOS  %D - "04/25/01" (%y)
  // Linux  %D - "04/25/99" (%y)
  // fmt    %D - "04/25/01" (%y)
  EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/01");

  EXPECT_EQ(fmt::format("{:%F}", tm), "-101-04-25");
  EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
}
#endif

TEST(chrono_test, grow_buffer) {
  auto s = std::string("{:");
  for (int i = 0; i < 30; ++i) s += "%c";
  s += "}\n";
  auto t = std::time(nullptr);
  fmt::format(fmt::runtime(s), *std::localtime(&t));
}

TEST(chrono_test, format_to_empty_container) {
  auto time = std::tm();
  time.tm_sec = 42;
  auto s = std::string();
  fmt::format_to(std::back_inserter(s), "{:%S}", time);
  EXPECT_EQ(s, "42");
}

TEST(chrono_test, empty_result) { EXPECT_EQ(fmt::format("{}", std::tm()), ""); }

auto equal(const std::tm& lhs, const std::tm& rhs) -> bool {
  return lhs.tm_sec == rhs.tm_sec && lhs.tm_min == rhs.tm_min &&
         lhs.tm_hour == rhs.tm_hour && lhs.tm_mday == rhs.tm_mday &&
         lhs.tm_mon == rhs.tm_mon && lhs.tm_year == rhs.tm_year &&
         lhs.tm_wday == rhs.tm_wday && lhs.tm_yday == rhs.tm_yday &&
         lhs.tm_isdst == rhs.tm_isdst;
}

TEST(chrono_test, localtime) {
  auto t = std::time(nullptr);
  auto tm = *std::localtime(&t);
  EXPECT_TRUE(equal(tm, fmt::localtime(t)));
}

TEST(chrono_test, gmtime) {
  auto t = std::time(nullptr);
  auto tm = *std::gmtime(&t);
  EXPECT_TRUE(equal(tm, fmt::gmtime(t)));
}

template <typename TimePoint> auto strftime(TimePoint tp) -> std::string {
  auto t = std::chrono::system_clock::to_time_t(tp);
  auto tm = *std::localtime(&t);
  char output[256] = {};
  std::strftime(output, sizeof(output), "%Y-%m-%d %H:%M:%S", &tm);
  return output;
}

TEST(chrono_test, time_point) {
  auto t1 = std::chrono::system_clock::now();
  EXPECT_EQ(strftime(t1), fmt::format("{:%Y-%m-%d %H:%M:%S}", t1));
  EXPECT_EQ(strftime(t1), fmt::format("{}", t1));
  using time_point =
      std::chrono::time_point<std::chrono::system_clock, std::chrono::seconds>;
  auto t2 = time_point(std::chrono::seconds(42));
  EXPECT_EQ(strftime(t2), fmt::format("{:%Y-%m-%d %H:%M:%S}", t2));

  std::vector<std::string> spec_list = {
      "%%",  "%n",  "%t",  "%Y",  "%EY", "%y",  "%Oy", "%Ey", "%C",  "%EC",
      "%G",  "%g",  "%b",  "%h",  "%B",  "%m",  "%Om", "%U",  "%OU", "%W",
      "%OW", "%V",  "%OV", "%j",  "%d",  "%Od", "%e",  "%Oe", "%a",  "%A",
      "%w",  "%Ow", "%u",  "%Ou", "%H",  "%OH", "%I",  "%OI", "%M",  "%OM",
      "%S",  "%OS", "%c",  "%Ec", "%x",  "%Ex", "%X",  "%EX", "%D",  "%F",
      "%r",  "%R",  "%T",  "%p",  "%z",  "%Z"};
  spec_list.push_back("%Y-%m-%d %H:%M:%S");
  for (const auto& spec : spec_list) {
    auto t = std::chrono::system_clock::to_time_t(t1);
    auto tm = *std::localtime(&t);
    char output[256] = {};
    std::strftime(output, sizeof(output), spec.c_str(), &tm);

    auto fmt_spec = std::string("{:").append(spec).append("}");
    EXPECT_EQ(output, fmt::format(fmt::runtime(fmt_spec), t1));
    EXPECT_EQ(output, fmt::format(fmt::runtime(fmt_spec), tm));
  }
}

#ifndef FMT_STATIC_THOUSANDS_SEPARATOR

TEST(chrono_test, format_default) {
  EXPECT_EQ("42s", fmt::format("{}", std::chrono::seconds(42)));
  EXPECT_EQ("42as",
            fmt::format("{}", std::chrono::duration<int, std::atto>(42)));
  EXPECT_EQ("42fs",
            fmt::format("{}", std::chrono::duration<int, std::femto>(42)));
  EXPECT_EQ("42ps",
            fmt::format("{}", std::chrono::duration<int, std::pico>(42)));
  EXPECT_EQ("42ns", fmt::format("{}", std::chrono::nanoseconds(42)));
  EXPECT_EQ("42µs", fmt::format("{}", std::chrono::microseconds(42)));
  EXPECT_EQ("42ms", fmt::format("{}", std::chrono::milliseconds(42)));
  EXPECT_EQ("42cs",
            fmt::format("{}", std::chrono::duration<int, std::centi>(42)));
  EXPECT_EQ("42ds",
            fmt::format("{}", std::chrono::duration<int, std::deci>(42)));
  EXPECT_EQ("42s", fmt::format("{}", std::chrono::seconds(42)));
  EXPECT_EQ("42das",
            fmt::format("{}", std::chrono::duration<int, std::deca>(42)));
  EXPECT_EQ("42hs",
            fmt::format("{}", std::chrono::duration<int, std::hecto>(42)));
  EXPECT_EQ("42ks",
            fmt::format("{}", std::chrono::duration<int, std::kilo>(42)));
  EXPECT_EQ("42Ms",
            fmt::format("{}", std::chrono::duration<int, std::mega>(42)));
  EXPECT_EQ("42Gs",
            fmt::format("{}", std::chrono::duration<int, std::giga>(42)));
  EXPECT_EQ("42Ts",
            fmt::format("{}", std::chrono::duration<int, std::tera>(42)));
  EXPECT_EQ("42Ps",
            fmt::format("{}", std::chrono::duration<int, std::peta>(42)));
  EXPECT_EQ("42Es",
            fmt::format("{}", std::chrono::duration<int, std::exa>(42)));
  EXPECT_EQ("42m", fmt::format("{}", std::chrono::minutes(42)));
  EXPECT_EQ("42h", fmt::format("{}", std::chrono::hours(42)));
  EXPECT_EQ(
      "42[15]s",
      fmt::format("{}", std::chrono::duration<int, std::ratio<15, 1>>(42)));
  EXPECT_EQ(
      "42[15/4]s",
      fmt::format("{}", std::chrono::duration<int, std::ratio<15, 4>>(42)));
}

TEST(chrono_test, align) {
  auto s = std::chrono::seconds(42);
  EXPECT_EQ("42s  ", fmt::format("{:5}", s));
  EXPECT_EQ("42s  ", fmt::format("{:{}}", s, 5));
  EXPECT_EQ("  42s", fmt::format("{:>5}", s));
  EXPECT_EQ("**42s**", fmt::format("{:*^7}", s));
  EXPECT_EQ("03:25:45    ",
            fmt::format("{:12%H:%M:%S}", std::chrono::seconds(12345)));
  EXPECT_EQ("    03:25:45",
            fmt::format("{:>12%H:%M:%S}", std::chrono::seconds(12345)));
  EXPECT_EQ("~~03:25:45~~",
            fmt::format("{:~^12%H:%M:%S}", std::chrono::seconds(12345)));
  EXPECT_EQ("03:25:45    ",
            fmt::format("{:{}%H:%M:%S}", std::chrono::seconds(12345), 12));
}

TEST(chrono_test, format_specs) {
  EXPECT_EQ("%", fmt::format("{:%%}", std::chrono::seconds(0)));
  EXPECT_EQ("\n", fmt::format("{:%n}", std::chrono::seconds(0)));
  EXPECT_EQ("\t", fmt::format("{:%t}", std::chrono::seconds(0)));
  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(0)));
  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(60)));
  EXPECT_EQ("42", fmt::format("{:%S}", std::chrono::seconds(42)));
  EXPECT_EQ("01.234", fmt::format("{:%S}", std::chrono::milliseconds(1234)));
  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(0)));
  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(60)));
  EXPECT_EQ("42", fmt::format("{:%M}", std::chrono::minutes(42)));
  EXPECT_EQ("01", fmt::format("{:%M}", std::chrono::seconds(61)));
  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(0)));
  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(24)));
  EXPECT_EQ("14", fmt::format("{:%H}", std::chrono::hours(14)));
  EXPECT_EQ("01", fmt::format("{:%H}", std::chrono::minutes(61)));
  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(0)));
  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(12)));
  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(24)));
  EXPECT_EQ("04", fmt::format("{:%I}", std::chrono::hours(4)));
  EXPECT_EQ("02", fmt::format("{:%I}", std::chrono::hours(14)));
  EXPECT_EQ("03:25:45",
            fmt::format("{:%H:%M:%S}", std::chrono::seconds(12345)));
  EXPECT_EQ("03:25", fmt::format("{:%R}", std::chrono::seconds(12345)));
  EXPECT_EQ("03:25:45", fmt::format("{:%T}", std::chrono::seconds(12345)));
  EXPECT_EQ("12345", fmt::format("{:%Q}", std::chrono::seconds(12345)));
  EXPECT_EQ("s", fmt::format("{:%q}", std::chrono::seconds(12345)));
}

TEST(chrono_test, invalid_specs) {
  auto sec = std::chrono::seconds(0);
  EXPECT_THROW_MSG(fmt::format(runtime("{:%a}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%A}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%c}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%x}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%Ex}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%X}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%EX}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%D}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%F}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%Ec}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%w}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%u}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%b}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%B}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%z}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%Z}"), sec), fmt::format_error,
                   "no date");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%Eq}"), sec), fmt::format_error,
                   "invalid format");
  EXPECT_THROW_MSG(fmt::format(runtime("{:%Oq}"), sec), fmt::format_error,
                   "invalid format");
}

auto format_tm(const std::tm& time, fmt::string_view spec,
               const std::locale& loc) -> std::string {
  auto& facet = std::use_facet<std::time_put<char>>(loc);
  std::ostringstream os;
  os.imbue(loc);
  facet.put(os, os, ' ', &time, spec.begin(), spec.end());
  return os.str();
}

TEST(chrono_test, locale) {
  auto loc = get_locale("ja_JP.utf8");
  if (loc == std::locale::classic()) return;
#  define EXPECT_TIME(spec, time, duration)                     \
    {                                                           \
      auto jp_loc = std::locale("ja_JP.utf8");                  \
      EXPECT_EQ(format_tm(time, spec, jp_loc),                  \
                fmt::format(jp_loc, "{:L" spec "}", duration)); \
    }
  EXPECT_TIME("%OH", make_hour(14), std::chrono::hours(14));
  EXPECT_TIME("%OI", make_hour(14), std::chrono::hours(14));
  EXPECT_TIME("%OM", make_minute(42), std::chrono::minutes(42));
  EXPECT_TIME("%OS", make_second(42), std::chrono::seconds(42));
  auto time = make_tm();
  time.tm_hour = 3;
  time.tm_min = 25;
  time.tm_sec = 45;
  auto sec = std::chrono::seconds(12345);
  EXPECT_TIME("%r", time, sec);
  EXPECT_TIME("%p", time, sec);
}

using dms = std::chrono::duration<double, std::milli>;

TEST(chrono_test, format_default_fp) {
  typedef std::chrono::duration<float> fs;
  EXPECT_EQ("1.234s", fmt::format("{}", fs(1.234)));
  typedef std::chrono::duration<float, std::milli> fms;
  EXPECT_EQ("1.234ms", fmt::format("{}", fms(1.234)));
  typedef std::chrono::duration<double> ds;
  EXPECT_EQ("1.234s", fmt::format("{}", ds(1.234)));
  EXPECT_EQ("1.234ms", fmt::format("{}", dms(1.234)));
}

TEST(chrono_test, format_precision) {
  EXPECT_THROW_MSG(fmt::format(runtime("{:.2}"), std::chrono::seconds(42)),
                   fmt::format_error,
                   "precision not allowed for this argument type");
  EXPECT_EQ("1.2ms", fmt::format("{:.1}", dms(1.234)));
  EXPECT_EQ("1.23ms", fmt::format("{:.{}}", dms(1.234), 2));
}

TEST(chrono_test, format_full_specs) {
  EXPECT_EQ("1.2ms ", fmt::format("{:6.1}", dms(1.234)));
  EXPECT_EQ("  1.23ms", fmt::format("{:>8.{}}", dms(1.234), 2));
  EXPECT_EQ(" 1.2ms ", fmt::format("{:^{}.{}}", dms(1.234), 7, 1));
  EXPECT_EQ(" 1.23ms ", fmt::format("{0:^{2}.{1}}", dms(1.234), 2, 8));
  EXPECT_EQ("=1.234ms=", fmt::format("{:=^{}.{}}", dms(1.234), 9, 3));
  EXPECT_EQ("*1.2340ms*", fmt::format("{:*^10.4}", dms(1.234)));
}

TEST(chrono_test, format_simple_q) {
  typedef std::chrono::duration<float> fs;
  EXPECT_EQ("1.234 s", fmt::format("{:%Q %q}", fs(1.234)));
  typedef std::chrono::duration<float, std::milli> fms;
  EXPECT_EQ("1.234 ms", fmt::format("{:%Q %q}", fms(1.234)));
  typedef std::chrono::duration<double> ds;
  EXPECT_EQ("1.234 s", fmt::format("{:%Q %q}", ds(1.234)));
  EXPECT_EQ("1.234 ms", fmt::format("{:%Q %q}", dms(1.234)));
}

TEST(chrono_test, format_precision_q) {
  EXPECT_THROW_MSG(fmt::format(runtime("{:.2%Q %q}"), std::chrono::seconds(42)),
                   fmt::format_error,
                   "precision not allowed for this argument type");
  EXPECT_EQ("1.2 ms", fmt::format("{:.1%Q %q}", dms(1.234)));
  EXPECT_EQ("1.23 ms", fmt::format("{:.{}%Q %q}", dms(1.234), 2));
}

TEST(chrono_test, format_full_specs_q) {
  EXPECT_EQ("1.2 ms ", fmt::format("{:7.1%Q %q}", dms(1.234)));
  EXPECT_EQ(" 1.23 ms", fmt::format("{:>8.{}%Q %q}", dms(1.234), 2));
  EXPECT_EQ(" 1.2 ms ", fmt::format("{:^{}.{}%Q %q}", dms(1.234), 8, 1));
  EXPECT_EQ(" 1.23 ms ", fmt::format("{0:^{2}.{1}%Q %q}", dms(1.234), 2, 9));
  EXPECT_EQ("=1.234 ms=", fmt::format("{:=^{}.{}%Q %q}", dms(1.234), 10, 3));
  EXPECT_EQ("*1.2340 ms*", fmt::format("{:*^11.4%Q %q}", dms(1.234)));
}

TEST(chrono_test, invalid_width_id) {
  EXPECT_THROW(fmt::format(runtime("{:{o}"), std::chrono::seconds(0)),
               fmt::format_error);
}

TEST(chrono_test, invalid_colons) {
  EXPECT_THROW(fmt::format(runtime("{0}=:{0::"), std::chrono::seconds(0)),
               fmt::format_error);
}

TEST(chrono_test, negative_durations) {
  EXPECT_EQ("-12345", fmt::format("{:%Q}", std::chrono::seconds(-12345)));
  EXPECT_EQ("-03:25:45",
            fmt::format("{:%H:%M:%S}", std::chrono::seconds(-12345)));
  EXPECT_EQ("-00:01",
            fmt::format("{:%M:%S}", std::chrono::duration<double>(-1)));
  EXPECT_EQ("s", fmt::format("{:%q}", std::chrono::seconds(-12345)));
  EXPECT_EQ("-00.127",
            fmt::format("{:%S}",
                        std::chrono::duration<signed char, std::milli>{-127}));
  auto min = std::numeric_limits<int>::min();
  EXPECT_EQ(fmt::format("{}", min),
            fmt::format("{:%Q}", std::chrono::duration<int>(min)));
}

TEST(chrono_test, special_durations) {
  EXPECT_EQ(
      "40.",
      fmt::format("{:%S}", std::chrono::duration<double>(1e20)).substr(0, 3));
  auto nan = std::numeric_limits<double>::quiet_NaN();
  EXPECT_EQ(
      "nan nan nan nan nan:nan nan",
      fmt::format("{:%I %H %M %S %R %r}", std::chrono::duration<double>(nan)));
  fmt::format("{:%S}",
              std::chrono::duration<float, std::atto>(1.79400457e+31f));
  EXPECT_EQ(fmt::format("{}", std::chrono::duration<float, std::exa>(1)),
            "1Es");
  EXPECT_EQ(fmt::format("{}", std::chrono::duration<float, std::atto>(1)),
            "1as");
  EXPECT_EQ(fmt::format("{:%R}", std::chrono::duration<char, std::mega>{2}),
            "03:33");
  EXPECT_EQ(fmt::format("{:%T}", std::chrono::duration<char, std::mega>{2}),
            "03:33:20");
}

TEST(chrono_test, unsigned_duration) {
  EXPECT_EQ("42s", fmt::format("{}", std::chrono::duration<unsigned>(42)));
}

TEST(chrono_test, weekday) {
  auto loc = get_locale("ru_RU.UTF-8");
  std::locale::global(loc);
  auto mon = fmt::weekday(1);
  EXPECT_EQ(fmt::format("{}", mon), "Mon");
  if (loc != std::locale::classic()) {
    EXPECT_THAT((std::vector<std::string>{"пн", "Пн", "пнд", "Пнд"}),
                Contains(fmt::format(loc, "{:L}", mon)));
  }
}

#endif  // FMT_STATIC_THOUSANDS_SEPARATOR