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ext-fmt/test/xchar-test.cc
Victor Zverovich 0b5287f8b7 Remove unused function
2024-05-15 16:47:35 -07:00

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// Formatting library for C++ - formatting library tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#include "fmt/xchar.h"
#include <algorithm>
#include <complex>
#include <cwchar>
#include <vector>
#include "fmt/chrono.h"
#include "fmt/color.h"
#include "fmt/ostream.h"
#include "fmt/ranges.h"
#include "fmt/std.h"
#include "gtest-extra.h" // Contains
#include "util.h" // get_locale
using fmt::detail::max_value;
using testing::Contains;
#if defined(__MINGW32__) && !defined(_UCRT)
// Only C89 conversion specifiers when using MSVCRT instead of UCRT
# define FMT_HAS_C99_STRFTIME 0
#else
# define FMT_HAS_C99_STRFTIME 1
#endif
struct non_string {};
template <typename T> class has_to_string_view_test : public testing::Test {};
using string_char_types = testing::Types<char, wchar_t, char16_t, char32_t>;
TYPED_TEST_SUITE(has_to_string_view_test, string_char_types);
template <typename Char>
struct derived_from_string_view : fmt::basic_string_view<Char> {};
TYPED_TEST(has_to_string_view_test, has_to_string_view) {
EXPECT_TRUE(fmt::detail::has_to_string_view<TypeParam*>::value);
EXPECT_TRUE(fmt::detail::has_to_string_view<const TypeParam*>::value);
EXPECT_TRUE(fmt::detail::has_to_string_view<TypeParam[2]>::value);
EXPECT_TRUE(fmt::detail::has_to_string_view<const TypeParam[2]>::value);
EXPECT_TRUE(
fmt::detail::has_to_string_view<std::basic_string<TypeParam>>::value);
EXPECT_TRUE(fmt::detail::has_to_string_view<
fmt::basic_string_view<TypeParam>>::value);
EXPECT_TRUE(fmt::detail::has_to_string_view<
derived_from_string_view<TypeParam>>::value);
using fmt_string_view = fmt::detail::std_string_view<TypeParam>;
EXPECT_TRUE(std::is_empty<fmt_string_view>::value !=
fmt::detail::has_to_string_view<fmt_string_view>::value);
EXPECT_FALSE(fmt::detail::has_to_string_view<non_string>::value);
}
// std::is_constructible is broken in MSVC until version 2015.
#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1900
struct explicitly_convertible_to_wstring_view {
explicit operator fmt::wstring_view() const { return L"foo"; }
};
TEST(xchar_test, format_explicitly_convertible_to_wstring_view) {
// Types explicitly convertible to wstring_view are not formattable by
// default because it may introduce ODR violations.
static_assert(
!fmt::is_formattable<explicitly_convertible_to_wstring_view>::value, "");
}
#endif
TEST(xchar_test, format) {
EXPECT_EQ(L"42", fmt::format(L"{}", 42));
EXPECT_EQ(L"4.2", fmt::format(L"{}", 4.2));
EXPECT_EQ(L"abc", fmt::format(L"{}", L"abc"));
EXPECT_EQ(L"z", fmt::format(L"{}", L'z'));
EXPECT_THROW(fmt::format(fmt::runtime(L"{:*\x343E}"), 42), fmt::format_error);
EXPECT_EQ(L"true", fmt::format(L"{}", true));
EXPECT_EQ(L"a", fmt::format(L"{0}", 'a'));
EXPECT_EQ(L"a", fmt::format(L"{0}", L'a'));
EXPECT_EQ(L"Cyrillic letter \x42e",
fmt::format(L"Cyrillic letter {}", L'\x42e'));
EXPECT_EQ(L"abc1", fmt::format(L"{}c{}", L"ab", 1));
}
TEST(xchar_test, is_formattable) {
static_assert(!fmt::is_formattable<const wchar_t*>::value, "");
}
TEST(xchar_test, compile_time_string) {
EXPECT_EQ(fmt::format(fmt::wformat_string<int>(L"{}"), 42), L"42");
#if defined(FMT_USE_STRING_VIEW) && FMT_CPLUSPLUS >= 201703L
EXPECT_EQ(fmt::format(FMT_STRING(std::wstring_view(L"{}")), 42), L"42");
#endif
}
#if FMT_CPLUSPLUS > 201103L
struct custom_char {
int value;
custom_char() = default;
template <typename T>
constexpr custom_char(T val) : value(static_cast<int>(val)) {}
constexpr operator char() const {
return value <= 0xff ? static_cast<char>(value) : '\0';
}
constexpr bool operator<(custom_char c) const { return value < c.value; }
};
namespace std {
template <> struct char_traits<custom_char> {
using char_type = custom_char;
using int_type = int;
using off_type = streamoff;
using pos_type = streampos;
using state_type = mbstate_t;
static constexpr void assign(char_type& r, const char_type& a) { r = a; }
static constexpr bool eq(char_type a, char_type b) { return a == b; }
static constexpr bool lt(char_type a, char_type b) { return a < b; }
static FMT_CONSTEXPR int compare(const char_type* s1, const char_type* s2,
size_t count) {
for (; count; count--, s1++, s2++) {
if (lt(*s1, *s2)) return -1;
if (lt(*s2, *s1)) return 1;
}
return 0;
}
static FMT_CONSTEXPR size_t length(const char_type* s) {
size_t count = 0;
while (!eq(*s++, custom_char(0))) count++;
return count;
}
static const char_type* find(const char_type*, size_t, const char_type&);
static FMT_CONSTEXPR char_type* move(char_type* dest, const char_type* src,
size_t count) {
if (count == 0) return dest;
char_type* ret = dest;
if (src < dest) {
dest += count;
src += count;
for (; count; count--) assign(*--dest, *--src);
} else if (src > dest)
copy(dest, src, count);
return ret;
}
static FMT_CONSTEXPR char_type* copy(char_type* dest, const char_type* src,
size_t count) {
char_type* ret = dest;
for (; count; count--) assign(*dest++, *src++);
return ret;
}
static FMT_CONSTEXPR char_type* assign(char_type* dest, std::size_t count,
char_type a) {
char_type* ret = dest;
for (; count; count--) assign(*dest++, a);
return ret;
}
static int_type not_eof(int_type);
static char_type to_char_type(int_type);
static int_type to_int_type(char_type);
static bool eq_int_type(int_type, int_type);
static int_type eof();
};
} // namespace std
auto to_ascii(custom_char c) -> char { return c; }
FMT_BEGIN_NAMESPACE
template <> struct is_char<custom_char> : std::true_type {};
FMT_END_NAMESPACE
TEST(xchar_test, format_custom_char) {
const custom_char format[] = {'{', '}', 0};
auto result = fmt::format(format, custom_char('x'));
EXPECT_EQ(result.size(), 1);
EXPECT_EQ(result[0], custom_char('x'));
}
#endif
TEST(xchar_test, format_to) {
auto buf = std::vector<wchar_t>();
fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');
EXPECT_STREQ(buf.data(), L"42");
}
TEST(xchar_test, compile_time_string_format_to) {
std::wstring ws;
fmt::format_to(std::back_inserter(ws), FMT_STRING(L"{}"), 42);
EXPECT_EQ(L"42", ws);
}
TEST(xchar_test, vformat_to) {
int n = 42;
auto args = fmt::make_wformat_args(n);
auto w = std::wstring();
fmt::vformat_to(std::back_inserter(w), L"{}", args);
EXPECT_EQ(L"42", w);
}
namespace test {
struct struct_as_wstring_view {};
auto format_as(struct_as_wstring_view) -> fmt::wstring_view { return L"foo"; }
} // namespace test
TEST(xchar_test, format_as) {
EXPECT_EQ(fmt::format(L"{}", test::struct_as_wstring_view()), L"foo");
}
TEST(format_test, wide_format_to_n) {
wchar_t buffer[4];
buffer[3] = L'x';
auto result = fmt::format_to_n(buffer, 3, L"{}", 12345);
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"123x", fmt::wstring_view(buffer, 4));
buffer[0] = L'x';
buffer[1] = L'x';
buffer[2] = L'x';
result = fmt::format_to_n(buffer, 3, L"{}", L'A');
EXPECT_EQ(1u, result.size);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ(L"Axxx", fmt::wstring_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, L"{}{} ", L'B', L'C');
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"BC x", fmt::wstring_view(buffer, 4));
}
#if FMT_USE_USER_DEFINED_LITERALS
TEST(xchar_test, named_arg_udl) {
using namespace fmt::literals;
auto udl_a =
fmt::format(L"{first}{second}{first}{third}", L"first"_a = L"abra",
L"second"_a = L"cad", L"third"_a = 99);
EXPECT_EQ(
fmt::format(L"{first}{second}{first}{third}", fmt::arg(L"first", L"abra"),
fmt::arg(L"second", L"cad"), fmt::arg(L"third", 99)),
udl_a);
}
#endif // FMT_USE_USER_DEFINED_LITERALS
TEST(xchar_test, print) {
// Check that the wide print overload compiles.
if (fmt::detail::const_check(false)) {
fmt::print(L"test");
fmt::println(L"test");
}
}
TEST(xchar_test, join) {
int v[3] = {1, 2, 3};
EXPECT_EQ(fmt::format(L"({})", fmt::join(v, v + 3, L", ")), L"(1, 2, 3)");
auto t = std::tuple<wchar_t, int, float>('a', 1, 2.0f);
EXPECT_EQ(fmt::format(L"({})", fmt::join(t, L", ")), L"(a, 1, 2)");
}
enum streamable_enum {};
std::wostream& operator<<(std::wostream& os, streamable_enum) {
return os << L"streamable_enum";
}
namespace fmt {
template <>
struct formatter<streamable_enum, wchar_t> : basic_ostream_formatter<wchar_t> {
};
} // namespace fmt
enum unstreamable_enum {};
auto format_as(unstreamable_enum e) -> int { return e; }
TEST(xchar_test, enum) {
EXPECT_EQ(L"streamable_enum", fmt::format(L"{}", streamable_enum()));
EXPECT_EQ(L"0", fmt::format(L"{}", unstreamable_enum()));
}
struct streamable_and_unformattable {};
auto operator<<(std::wostream& os, streamable_and_unformattable)
-> std::wostream& {
return os << L"foo";
}
TEST(xchar_test, streamed) {
EXPECT_FALSE(fmt::is_formattable<streamable_and_unformattable>());
EXPECT_EQ(fmt::format(L"{}", fmt::streamed(streamable_and_unformattable())),
L"foo");
}
TEST(xchar_test, sign_not_truncated) {
wchar_t format_str[] = {
L'{', L':',
'+' | static_cast<wchar_t>(1 << fmt::detail::num_bits<char>()), L'}', 0};
EXPECT_THROW(fmt::format(fmt::runtime(format_str), 42), fmt::format_error);
}
TEST(xchar_test, chrono) {
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(L"42s", fmt::format(L"{}", std::chrono::seconds(42)));
EXPECT_EQ(fmt::format(L"{:%F}", tm), L"2016-04-25");
EXPECT_EQ(fmt::format(L"{:%T}", tm), L"11:22:33");
}
std::wstring system_wcsftime(const std::wstring& format, const std::tm* timeptr,
std::locale* locptr = nullptr) {
auto loc = locptr ? *locptr : std::locale::classic();
auto& facet = std::use_facet<std::time_put<wchar_t>>(loc);
std::wostringstream os;
os.imbue(loc);
facet.put(os, os, L' ', timeptr, format.c_str(),
format.c_str() + format.size());
#ifdef _WIN32
// Workaround a bug in older versions of Universal CRT.
auto str = os.str();
if (str == L"-0000") str = L"+0000";
return str;
#else
return os.str();
#endif
}
TEST(chrono_test_wchar, time_point) {
auto t1 = std::chrono::time_point_cast<std::chrono::seconds>(
std::chrono::system_clock::now());
std::vector<std::wstring> spec_list = {
L"%%", L"%n", L"%t", L"%Y", L"%EY", L"%y", L"%Oy", L"%Ey", L"%C",
L"%EC", L"%G", L"%g", L"%b", L"%h", L"%B", L"%m", L"%Om", L"%U",
L"%OU", L"%W", L"%OW", L"%V", L"%OV", L"%j", L"%d", L"%Od", L"%e",
L"%Oe", L"%a", L"%A", L"%w", L"%Ow", L"%u", L"%Ou", L"%H", L"%OH",
L"%I", L"%OI", L"%M", L"%OM", L"%S", L"%OS", L"%x", L"%Ex", L"%X",
L"%EX", L"%D", L"%F", L"%R", L"%T", L"%p"};
#ifndef _WIN32
// Disabled on Windows, because these formats is not consistent among
// platforms.
spec_list.insert(spec_list.end(), {L"%c", L"%Ec", L"%r"});
#elif !FMT_HAS_C99_STRFTIME
// Only C89 conversion specifiers when using MSVCRT instead of UCRT
spec_list = {L"%%", L"%Y", L"%y", L"%b", L"%B", L"%m", L"%U",
L"%W", L"%j", L"%d", L"%a", L"%A", L"%w", L"%H",
L"%I", L"%M", L"%S", L"%x", L"%X", L"%p"};
#endif
spec_list.push_back(L"%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::gmtime(&t);
auto sys_output = system_wcsftime(spec, &tm);
auto fmt_spec = fmt::format(L"{{:{}}}", spec);
EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), t1));
EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
}
// Timezone formatters tests makes sense for localtime.
#if FMT_HAS_C99_STRFTIME
spec_list = {L"%z", L"%Z"};
#else
spec_list = {L"%Z"};
#endif
for (const auto& spec : spec_list) {
auto t = std::chrono::system_clock::to_time_t(t1);
auto tm = *std::localtime(&t);
auto sys_output = system_wcsftime(spec, &tm);
auto fmt_spec = fmt::format(L"{{:{}}}", spec);
EXPECT_EQ(sys_output, fmt::format(fmt::runtime(fmt_spec), tm));
if (spec == L"%z") {
sys_output.insert(sys_output.end() - 2, 1, L':');
EXPECT_EQ(sys_output, fmt::format(L"{:%Ez}", tm));
EXPECT_EQ(sys_output, fmt::format(L"{:%Oz}", tm));
}
}
// Separate tests for UTC, since std::time_put can use local time and ignoring
// the timezone in std::tm (if it presents on platform).
if (fmt::detail::has_member_data_tm_zone<std::tm>::value) {
auto t = std::chrono::system_clock::to_time_t(t1);
auto tm = *std::gmtime(&t);
std::vector<std::wstring> tz_names = {L"GMT", L"UTC"};
EXPECT_THAT(tz_names, Contains(fmt::format(L"{:%Z}", t1)));
EXPECT_THAT(tz_names, Contains(fmt::format(L"{:%Z}", tm)));
}
if (fmt::detail::has_member_data_tm_gmtoff<std::tm>::value) {
auto t = std::chrono::system_clock::to_time_t(t1);
auto tm = *std::gmtime(&t);
EXPECT_EQ(L"+0000", fmt::format(L"{:%z}", t1));
EXPECT_EQ(L"+0000", fmt::format(L"{:%z}", tm));
EXPECT_EQ(L"+00:00", fmt::format(L"{:%Ez}", t1));
EXPECT_EQ(L"+00:00", fmt::format(L"{:%Ez}", tm));
EXPECT_EQ(L"+00:00", fmt::format(L"{:%Oz}", t1));
EXPECT_EQ(L"+00:00", fmt::format(L"{:%Oz}", tm));
}
}
TEST(xchar_test, color) {
EXPECT_EQ(fmt::format(fg(fmt::rgb(255, 20, 30)), L"rgb(255,20,30) wide"),
L"\x1b[38;2;255;020;030mrgb(255,20,30) wide\x1b[0m");
}
TEST(xchar_test, ostream) {
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 409
{
std::wostringstream wos;
fmt::print(wos, L"Don't {}!", L"panic");
EXPECT_EQ(wos.str(), L"Don't panic!");
}
{
std::wostringstream wos;
fmt::println(wos, L"Don't {}!", L"panic");
EXPECT_EQ(wos.str(), L"Don't panic!\n");
}
#endif
}
TEST(xchar_test, format_map) {
auto m = std::map<std::wstring, int>{{L"one", 1}, {L"t\"wo", 2}};
EXPECT_EQ(fmt::format(L"{}", m), L"{\"one\": 1, \"t\\\"wo\": 2}");
}
TEST(xchar_test, escape_string) {
using vec = std::vector<std::wstring>;
EXPECT_EQ(fmt::format(L"{}", vec{L"\n\r\t\"\\"}), L"[\"\\n\\r\\t\\\"\\\\\"]");
EXPECT_EQ(fmt::format(L"{}", vec{L"понедельник"}), L"[\"понедельник\"]");
}
TEST(xchar_test, to_wstring) { EXPECT_EQ(L"42", fmt::to_wstring(42)); }
#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
template <typename Char> struct numpunct : std::numpunct<Char> {
protected:
Char do_decimal_point() const override { return '?'; }
std::string do_grouping() const override { return "\03"; }
Char do_thousands_sep() const override { return '~'; }
};
template <typename Char> struct no_grouping : std::numpunct<Char> {
protected:
Char do_decimal_point() const override { return '.'; }
std::string do_grouping() const override { return ""; }
Char do_thousands_sep() const override { return ','; }
};
template <typename Char> struct special_grouping : std::numpunct<Char> {
protected:
Char do_decimal_point() const override { return '.'; }
std::string do_grouping() const override { return "\03\02"; }
Char do_thousands_sep() const override { return ','; }
};
template <typename Char> struct small_grouping : std::numpunct<Char> {
protected:
Char do_decimal_point() const override { return '.'; }
std::string do_grouping() const override { return "\01"; }
Char do_thousands_sep() const override { return ','; }
};
TEST(locale_test, localized_double) {
auto loc = std::locale(std::locale(), new numpunct<char>());
EXPECT_EQ(fmt::format(loc, "{:L}", 1.23), "1?23");
EXPECT_EQ(fmt::format(loc, "{:Lf}", 1.23), "1?230000");
EXPECT_EQ(fmt::format(loc, "{:L}", 1234.5), "1~234?5");
EXPECT_EQ(fmt::format(loc, "{:L}", 12000.0), "12~000");
EXPECT_EQ(fmt::format(loc, "{:8L}", 1230.0), " 1~230");
EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 0.1), " 0?100000");
EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 1.0), " 1?000000");
EXPECT_EQ(fmt::format(loc, "{:15.6Lf}", 1e3), " 1~000?000000");
}
TEST(locale_test, format) {
auto loc = std::locale(std::locale(), new numpunct<char>());
EXPECT_EQ("1234567", fmt::format(std::locale(), "{:L}", 1234567));
EXPECT_EQ("1~234~567", fmt::format(loc, "{:L}", 1234567));
EXPECT_EQ("-1~234~567", fmt::format(loc, "{:L}", -1234567));
EXPECT_EQ("-256", fmt::format(loc, "{:L}", -256));
auto n = 1234567;
EXPECT_EQ("1~234~567", fmt::vformat(loc, "{:L}", fmt::make_format_args(n)));
auto s = std::string();
fmt::format_to(std::back_inserter(s), loc, "{:L}", 1234567);
EXPECT_EQ("1~234~567", s);
auto no_grouping_loc = std::locale(std::locale(), new no_grouping<char>());
EXPECT_EQ("1234567", fmt::format(no_grouping_loc, "{:L}", 1234567));
auto special_grouping_loc =
std::locale(std::locale(), new special_grouping<char>());
EXPECT_EQ("1,23,45,678", fmt::format(special_grouping_loc, "{:L}", 12345678));
EXPECT_EQ("12,345", fmt::format(special_grouping_loc, "{:L}", 12345));
auto small_grouping_loc =
std::locale(std::locale(), new small_grouping<char>());
EXPECT_EQ("4,2,9,4,9,6,7,2,9,5",
fmt::format(small_grouping_loc, "{:L}", max_value<uint32_t>()));
}
TEST(locale_test, format_default_align) {
auto loc = std::locale({}, new special_grouping<char>());
EXPECT_EQ(" 12,345", fmt::format(loc, "{:8L}", 12345));
}
TEST(locale_test, format_plus) {
auto loc = std::locale({}, new special_grouping<char>());
EXPECT_EQ("+100", fmt::format(loc, "{:+L}", 100));
}
TEST(locale_test, wformat) {
auto loc = std::locale(std::locale(), new numpunct<wchar_t>());
EXPECT_EQ(L"1234567", fmt::format(std::locale(), L"{:L}", 1234567));
EXPECT_EQ(L"1~234~567", fmt::format(loc, L"{:L}", 1234567));
int n = 1234567;
EXPECT_EQ(L"1~234~567",
fmt::vformat(loc, L"{:L}", fmt::make_wformat_args(n)));
EXPECT_EQ(L"1234567", fmt::format(std::locale("C"), L"{:L}", 1234567));
auto no_grouping_loc = std::locale(std::locale(), new no_grouping<wchar_t>());
EXPECT_EQ(L"1234567", fmt::format(no_grouping_loc, L"{:L}", 1234567));
auto special_grouping_loc =
std::locale(std::locale(), new special_grouping<wchar_t>());
EXPECT_EQ(L"1,23,45,678",
fmt::format(special_grouping_loc, L"{:L}", 12345678));
auto small_grouping_loc =
std::locale(std::locale(), new small_grouping<wchar_t>());
EXPECT_EQ(L"4,2,9,4,9,6,7,2,9,5",
fmt::format(small_grouping_loc, L"{:L}", max_value<uint32_t>()));
}
TEST(locale_test, int_formatter) {
auto loc = std::locale(std::locale(), new special_grouping<char>());
auto f = fmt::formatter<int>();
auto parse_ctx = fmt::format_parse_context("L");
f.parse(parse_ctx);
auto buf = fmt::memory_buffer();
fmt::basic_format_context<fmt::appender, char> format_ctx(
fmt::appender(buf), {}, fmt::detail::locale_ref(loc));
f.format(12345, format_ctx);
EXPECT_EQ(fmt::to_string(buf), "12,345");
}
TEST(locale_test, chrono_weekday) {
auto loc = get_locale("es_ES.UTF-8", "Spanish_Spain.1252");
auto loc_old = std::locale::global(loc);
auto sat = fmt::weekday(6);
EXPECT_EQ(fmt::format(L"{}", sat), L"Sat");
if (loc != std::locale::classic()) {
// L'\xE1' is 'á'.
auto saturdays = std::vector<std::wstring>{
L"s\xE1"
"b",
L"s\xE1."};
EXPECT_THAT(saturdays, Contains(fmt::format(loc, L"{:L}", sat)));
}
std::locale::global(loc_old);
}
TEST(locale_test, sign) {
EXPECT_EQ(fmt::format(std::locale(), L"{:L}", -50), L"-50");
}
TEST(std_test_xchar, complex) {
auto s = fmt::format(L"{}", std::complex<double>(1, 2));
EXPECT_EQ(s, L"(1+2i)");
EXPECT_EQ(fmt::format(L"{:.2f}", std::complex<double>(1, 2)), L"(1.00+2.00i)");
EXPECT_EQ(fmt::format(L"{:8}", std::complex<double>(1, 2)), L"(1+2i) ");
}
TEST(std_test_xchar, optional) {
# ifdef __cpp_lib_optional
EXPECT_EQ(fmt::format(L"{}", std::optional{L'C'}), L"optional(\'C\')");
EXPECT_EQ(fmt::format(L"{}", std::optional{std::wstring{L"wide string"}}),
L"optional(\"wide string\")");
# endif
}
#endif // FMT_STATIC_THOUSANDS_SEPARATOR
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