1 // Formatting library for C++ - module tests
2 //
3 // Copyright (c) 2012 - present, Victor Zverovich
4 // All rights reserved.
5 //
6 // For the license information refer to format.h.
7 //
8 // Copyright (c) 2021 - present, Daniela Engert
9 // All Rights Reserved
10 // {fmt} module.
11
12 #ifdef _MSC_FULL_VER
13 // hide some implementation bugs in msvc
14 // that are not essential to users of the module.
15 # define FMT_HIDE_MODULE_BUGS
16 #endif
17
18 #include <bit>
19 #include <chrono>
20 #include <exception>
21 #include <iterator>
22 #include <locale>
23 #include <memory>
24 #include <ostream>
25 #include <string>
26 #include <string_view>
27 #include <system_error>
28
29 #if (__has_include(<fcntl.h>) || defined(__APPLE__) || \
30 defined(__linux__)) && \
31 (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
32 # include <fcntl.h>
33 # define FMT_USE_FCNTL 1
34 #else
35 # define FMT_USE_FCNTL 0
36 #endif
37 #if defined(_WIN32) && !defined(__MINGW32__)
38 # define FMT_POSIX(call) _##call
39 #else
40 # define FMT_POSIX(call) call
41 #endif
42
43 import fmt;
44
45 // check for macros leaking from BMI
46 static bool macro_leaked =
47 #if defined(FMT_CORE_H_) || defined(FMT_FORMAT_H_)
48 true;
49 #else
50 false;
51 #endif
52
53 #define FMT_OS_H_ // don't pull in os.h, neither directly nor indirectly
54 #include "gtest-extra.h"
55
56 // an implicitly exported namespace must be visible [module.interface]/2.2
TEST(module_test,namespace)57 TEST(module_test, namespace) {
58 using namespace fmt;
59 using namespace fmt::literals;
60 ASSERT_TRUE(true);
61 }
62
63 namespace detail {
64 bool oops_detail_namespace_is_visible;
65 }
66
67 namespace fmt {
namespace_detail_invisible()68 bool namespace_detail_invisible() {
69 #if defined(FMT_HIDE_MODULE_BUGS) && defined(_MSC_FULL_VER) && \
70 _MSC_FULL_VER <= 193700000
71 // bug in msvc up to at least 17.7:
72
73 // the namespace is visible even when it is neither
74 // implicitly nor explicitly exported
75 return true;
76 #else
77 using namespace detail;
78 // this fails to compile if fmt::detail is visible
79 return !oops_detail_namespace_is_visible;
80 #endif
81 }
82 } // namespace fmt
83
84 // the non-exported namespace 'detail' must be invisible [module.interface]/2
TEST(module_test,detail_namespace)85 TEST(module_test, detail_namespace) {
86 EXPECT_TRUE(fmt::namespace_detail_invisible());
87 }
88
89 // macros must not be imported from a *named* module [cpp.import]/5.1
TEST(module_test,macros)90 TEST(module_test, macros) {
91 #if defined(FMT_HIDE_MODULE_BUGS) && defined(_MSC_FULL_VER) && \
92 _MSC_FULL_VER <= 192930130
93 // bug in msvc up to 16.11-pre2:
94 // include-guard macros leak from BMI
95 // and even worse: they cannot be #undef-ined
96 macro_leaked = false;
97 #endif
98 EXPECT_FALSE(macro_leaked);
99 }
100
101 // The following is less about functional testing (that's done elsewhere)
102 // but rather visibility of all client-facing overloads, reachability of
103 // non-exported entities, name lookup and overload resolution within
104 // template instantitions.
105 // Exercise all exported entities of the API at least once.
106 // Instantiate as many code paths as possible.
107
TEST(module_test,to_string)108 TEST(module_test, to_string) {
109 EXPECT_EQ("42", fmt::to_string(42));
110 EXPECT_EQ("42", fmt::to_string(42.0));
111
112 EXPECT_EQ(L"42", fmt::to_wstring(42));
113 EXPECT_EQ(L"42", fmt::to_wstring(42.0));
114 }
115
TEST(module_test,format)116 TEST(module_test, format) {
117 EXPECT_EQ("42", fmt::format("{:}", 42));
118 EXPECT_EQ("-42", fmt::format("{0}", -42.0));
119
120 EXPECT_EQ(L"42", fmt::format(L"{:}", 42));
121 EXPECT_EQ(L"-42", fmt::format(L"{0}", -42.0));
122 }
123
TEST(module_test,format_to)124 TEST(module_test, format_to) {
125 std::string s;
126 fmt::format_to(std::back_inserter(s), "{}", 42);
127 EXPECT_EQ("42", s);
128
129 char buffer[4] = {0};
130 fmt::format_to(buffer, "{}", 42);
131 EXPECT_EQ("42", std::string_view(buffer));
132
133 fmt::memory_buffer mb;
134 fmt::format_to(std::back_inserter(mb), "{}", 42);
135 EXPECT_EQ("42", std::string_view(buffer));
136
137 std::wstring w;
138 fmt::format_to(std::back_inserter(w), L"{}", 42);
139 EXPECT_EQ(L"42", w);
140
141 wchar_t wbuffer[4] = {0};
142 fmt::format_to(wbuffer, L"{}", 42);
143 EXPECT_EQ(L"42", std::wstring_view(wbuffer));
144
145 fmt::wmemory_buffer wb;
146 fmt::format_to(std::back_inserter(wb), L"{}", 42);
147 EXPECT_EQ(L"42", std::wstring_view(wbuffer));
148 }
149
TEST(module_test,formatted_size)150 TEST(module_test, formatted_size) {
151 EXPECT_EQ(2u, fmt::formatted_size("{}", 42));
152 EXPECT_EQ(2u, fmt::formatted_size(L"{}", 42));
153 }
154
TEST(module_test,format_to_n)155 TEST(module_test, format_to_n) {
156 std::string s;
157 auto result = fmt::format_to_n(std::back_inserter(s), 1, "{}", 42);
158 EXPECT_EQ(2u, result.size);
159 char buffer[4] = {0};
160 fmt::format_to_n(buffer, 3, "{}", 12345);
161
162 std::wstring w;
163 auto wresult = fmt::format_to_n(std::back_inserter(w), 1, L"{}", 42);
164 EXPECT_EQ(2u, wresult.size);
165 wchar_t wbuffer[4] = {0};
166 fmt::format_to_n(wbuffer, 3, L"{}", 12345);
167 }
168
TEST(module_test,format_args)169 TEST(module_test, format_args) {
170 auto no_args = fmt::format_args();
171 EXPECT_FALSE(no_args.get(1));
172
173 fmt::basic_format_args args = fmt::make_format_args(42);
174 EXPECT_TRUE(args.max_size() > 0);
175 auto arg0 = args.get(0);
176 EXPECT_TRUE(arg0);
177 decltype(arg0) arg_none;
178 EXPECT_FALSE(arg_none);
179 EXPECT_TRUE(arg0.type() != arg_none.type());
180 }
181
TEST(module_test,wformat_args)182 TEST(module_test, wformat_args) {
183 auto no_args = fmt::wformat_args();
184 EXPECT_FALSE(no_args.get(1));
185 fmt::basic_format_args args = fmt::make_wformat_args(42);
186 EXPECT_TRUE(args.get(0));
187 }
188
TEST(module_test,dynamic_format_args)189 TEST(module_test, dynamic_format_args) {
190 fmt::dynamic_format_arg_store<fmt::format_context> dyn_store;
191 dyn_store.push_back(fmt::arg("a42", 42));
192 fmt::basic_format_args args = dyn_store;
193 EXPECT_FALSE(args.get(3));
194 EXPECT_TRUE(args.get(fmt::string_view("a42")));
195
196 fmt::dynamic_format_arg_store<fmt::wformat_context> wdyn_store;
197 wdyn_store.push_back(fmt::arg(L"a42", 42));
198 fmt::basic_format_args wargs = wdyn_store;
199 EXPECT_FALSE(wargs.get(3));
200 EXPECT_TRUE(wargs.get(fmt::wstring_view(L"a42")));
201 }
202
TEST(module_test,vformat)203 TEST(module_test, vformat) {
204 EXPECT_EQ("42", fmt::vformat("{}", fmt::make_format_args(42)));
205 EXPECT_EQ(L"42",
206 fmt::vformat(fmt::wstring_view(L"{}"), fmt::make_wformat_args(42)));
207 }
208
TEST(module_test,vformat_to)209 TEST(module_test, vformat_to) {
210 auto store = fmt::make_format_args(42);
211 std::string s;
212 fmt::vformat_to(std::back_inserter(s), "{}", store);
213 EXPECT_EQ("42", s);
214
215 char buffer[4] = {0};
216 fmt::vformat_to(buffer, "{:}", store);
217 EXPECT_EQ("42", std::string_view(buffer));
218
219 auto wstore = fmt::make_wformat_args(42);
220 std::wstring w;
221 fmt::vformat_to(std::back_inserter(w), L"{}", wstore);
222 EXPECT_EQ(L"42", w);
223
224 wchar_t wbuffer[4] = {0};
225 fmt::vformat_to(wbuffer, L"{:}", wstore);
226 EXPECT_EQ(L"42", std::wstring_view(wbuffer));
227 }
228
TEST(module_test,vformat_to_n)229 TEST(module_test, vformat_to_n) {
230 auto store = fmt::make_format_args(12345);
231 std::string s;
232 auto result = fmt::vformat_to_n(std::back_inserter(s), 1, "{}", store);
233 char buffer[4] = {0};
234 fmt::vformat_to_n(buffer, 3, "{:}", store);
235
236 auto wstore = fmt::make_wformat_args(12345);
237 std::wstring w;
238 auto wresult = fmt::vformat_to_n(std::back_inserter(w), 1,
239 fmt::wstring_view(L"{}"), wstore);
240 wchar_t wbuffer[4] = {0};
241 fmt::vformat_to_n(wbuffer, 3, fmt::wstring_view(L"{:}"), wstore);
242 }
243
as_string(std::wstring_view text)244 std::string as_string(std::wstring_view text) {
245 return {reinterpret_cast<const char*>(text.data()),
246 text.size() * sizeof(text[0])};
247 }
248
TEST(module_test,print)249 TEST(module_test, print) {
250 EXPECT_WRITE(stdout, fmt::print("{}µ", 42), "42µ");
251 EXPECT_WRITE(stderr, fmt::print(stderr, "{}µ", 4.2), "4.2µ");
252 EXPECT_WRITE(stdout, fmt::print(L"{}µ", 42), as_string(L"42µ"));
253 EXPECT_WRITE(stderr, fmt::print(stderr, L"{}µ", 4.2), as_string(L"4.2µ"));
254 }
255
TEST(module_test,vprint)256 TEST(module_test, vprint) {
257 EXPECT_WRITE(stdout, fmt::vprint("{:}µ", fmt::make_format_args(42)), "42µ");
258 EXPECT_WRITE(stderr, fmt::vprint(stderr, "{}", fmt::make_format_args(4.2)),
259 "4.2");
260 EXPECT_WRITE(stdout, fmt::vprint(L"{:}µ", fmt::make_wformat_args(42)),
261 as_string(L"42µ"));
262 EXPECT_WRITE(stderr, fmt::vprint(stderr, L"{}", fmt::make_wformat_args(42)),
263 as_string(L"42"));
264 }
265
TEST(module_test,named_args)266 TEST(module_test, named_args) {
267 EXPECT_EQ("42", fmt::format("{answer}", fmt::arg("answer", 42)));
268 EXPECT_EQ(L"42", fmt::format(L"{answer}", fmt::arg(L"answer", 42)));
269 }
270
TEST(module_test,literals)271 TEST(module_test, literals) {
272 using namespace fmt::literals;
273 EXPECT_EQ("42", fmt::format("{answer}", "answer"_a = 42));
274 EXPECT_EQ(L"42", fmt::format(L"{answer}", L"answer"_a = 42));
275 }
276
TEST(module_test,locale)277 TEST(module_test, locale) {
278 auto store = fmt::make_format_args(4.2);
279 const auto classic = std::locale::classic();
280 EXPECT_EQ("4.2", fmt::format(classic, "{:L}", 4.2));
281 EXPECT_EQ("4.2", fmt::vformat(classic, "{:L}", store));
282 std::string s;
283 fmt::vformat_to(std::back_inserter(s), classic, "{:L}", store);
284 EXPECT_EQ("4.2", s);
285 EXPECT_EQ("4.2", fmt::format("{:L}", 4.2));
286
287 auto wstore = fmt::make_wformat_args(4.2);
288 EXPECT_EQ(L"4.2", fmt::format(classic, L"{:L}", 4.2));
289 EXPECT_EQ(L"4.2", fmt::vformat(classic, L"{:L}", wstore));
290 std::wstring w;
291 fmt::vformat_to(std::back_inserter(w), classic, L"{:L}", wstore);
292 EXPECT_EQ(L"4.2", w);
293 EXPECT_EQ(L"4.2", fmt::format(L"{:L}", 4.2));
294 }
295
TEST(module_test,string_view)296 TEST(module_test, string_view) {
297 fmt::string_view nsv("fmt");
298 EXPECT_EQ("fmt", nsv);
299 EXPECT_TRUE(fmt::string_view("fmt") == nsv);
300
301 fmt::wstring_view wsv(L"fmt");
302 EXPECT_EQ(L"fmt", wsv);
303 EXPECT_TRUE(fmt::wstring_view(L"fmt") == wsv);
304 }
305
TEST(module_test,memory_buffer)306 TEST(module_test, memory_buffer) {
307 fmt::basic_memory_buffer<char, fmt::inline_buffer_size> buffer;
308 fmt::format_to(std::back_inserter(buffer), "{}", "42");
309 EXPECT_EQ("42", to_string(buffer));
310 fmt::memory_buffer nbuffer(std::move(buffer));
311 EXPECT_EQ("42", to_string(nbuffer));
312 buffer = std::move(nbuffer);
313 EXPECT_EQ("42", to_string(buffer));
314 nbuffer.clear();
315 EXPECT_EQ(0u, to_string(nbuffer).size());
316
317 fmt::wmemory_buffer wbuffer;
318 EXPECT_EQ(0u, to_string(wbuffer).size());
319 }
320
TEST(module_test,is_char)321 TEST(module_test, is_char) {
322 EXPECT_TRUE(fmt::is_char<char>());
323 EXPECT_TRUE(fmt::is_char<wchar_t>());
324 EXPECT_TRUE(fmt::is_char<char8_t>());
325 EXPECT_TRUE(fmt::is_char<char16_t>());
326 EXPECT_TRUE(fmt::is_char<char32_t>());
327 EXPECT_FALSE(fmt::is_char<signed char>());
328 }
329
TEST(module_test,ptr)330 TEST(module_test, ptr) {
331 uintptr_t answer = 42;
332 auto p = std::bit_cast<int*>(answer);
333 EXPECT_EQ("0x2a", fmt::to_string(fmt::ptr(p)));
334 std::unique_ptr<int> up(p);
335 EXPECT_EQ("0x2a", fmt::to_string(fmt::ptr(up)));
336 up.release();
337 auto sp = std::make_shared<int>(0);
338 p = sp.get();
339 EXPECT_EQ(fmt::to_string(fmt::ptr(p)), fmt::to_string(fmt::ptr(sp)));
340 }
341
TEST(module_test,errors)342 TEST(module_test, errors) {
343 auto store = fmt::make_format_args(42);
344 EXPECT_THROW(throw fmt::format_error("oops"), std::exception);
345 EXPECT_THROW(throw fmt::vsystem_error(0, "{}", store), std::system_error);
346 EXPECT_THROW(throw fmt::system_error(0, "{}", 42), std::system_error);
347
348 fmt::memory_buffer buffer;
349 fmt::format_system_error(buffer, 0, "oops");
350 auto oops = to_string(buffer);
351 EXPECT_TRUE(oops.size() > 0);
352 EXPECT_WRITE(stderr, fmt::report_system_error(0, "oops"), oops + '\n');
353
354 #ifdef _WIN32
355 EXPECT_THROW(throw fmt::vwindows_error(0, "{}", store), std::system_error);
356 EXPECT_THROW(throw fmt::windows_error(0, "{}", 42), std::system_error);
357 output_redirect redirect(stderr);
358 fmt::report_windows_error(0, "oops");
359 EXPECT_TRUE(redirect.restore_and_read().size() > 0);
360 #endif
361 }
362
TEST(module_test,error_code)363 TEST(module_test, error_code) {
364 EXPECT_EQ("generic:42",
365 fmt::format("{0}", std::error_code(42, std::generic_category())));
366 EXPECT_EQ("system:42",
367 fmt::format("{0}", std::error_code(42, fmt::system_category())));
368 EXPECT_EQ(L"generic:42",
369 fmt::format(L"{0}", std::error_code(42, std::generic_category())));
370 }
371
TEST(module_test,format_int)372 TEST(module_test, format_int) {
373 fmt::format_int sanswer(42);
374 EXPECT_EQ("42", fmt::string_view(sanswer.data(), sanswer.size()));
375 fmt::format_int uanswer(42u);
376 EXPECT_EQ("42", fmt::string_view(uanswer.data(), uanswer.size()));
377 }
378
379 struct test_formatter : fmt::formatter<char> {
checktest_formatter380 bool check() { return true; }
381 };
382
TEST(module_test,formatter)383 TEST(module_test, formatter) { EXPECT_TRUE(test_formatter{}.check()); }
384
TEST(module_test,join)385 TEST(module_test, join) {
386 int arr[3] = {1, 2, 3};
387 std::vector<double> vec{1.0, 2.0, 3.0};
388 std::initializer_list<int> il{1, 2, 3};
389 auto sep = fmt::string_view(", ");
390 EXPECT_EQ("1, 2, 3", to_string(fmt::join(arr + 0, arr + 3, sep)));
391 EXPECT_EQ("1, 2, 3", to_string(fmt::join(arr, sep)));
392 EXPECT_EQ("1, 2, 3", to_string(fmt::join(vec.begin(), vec.end(), sep)));
393 EXPECT_EQ("1, 2, 3", to_string(fmt::join(vec, sep)));
394 EXPECT_EQ("1, 2, 3", to_string(fmt::join(il, sep)));
395
396 auto wsep = fmt::wstring_view(L", ");
397 EXPECT_EQ(L"1, 2, 3", fmt::format(L"{}", fmt::join(arr + 0, arr + 3, wsep)));
398 EXPECT_EQ(L"1, 2, 3", fmt::format(L"{}", fmt::join(arr, wsep)));
399 EXPECT_EQ(L"1, 2, 3", fmt::format(L"{}", fmt::join(il, wsep)));
400 }
401
TEST(module_test,time)402 TEST(module_test, time) {
403 auto time_now = std::time(nullptr);
404 EXPECT_TRUE(fmt::localtime(time_now).tm_year > 120);
405 EXPECT_TRUE(fmt::gmtime(time_now).tm_year > 120);
406 auto chrono_now = std::chrono::system_clock::now();
407 EXPECT_TRUE(fmt::gmtime(chrono_now).tm_year > 120);
408 }
409
TEST(module_test,time_point)410 TEST(module_test, time_point) {
411 auto now = std::chrono::system_clock::now();
412 std::string_view past("2021-05-20 10:30:15");
413 EXPECT_TRUE(past < fmt::format("{:%Y-%m-%d %H:%M:%S}", now));
414 std::wstring_view wpast(L"2021-05-20 10:30:15");
415 EXPECT_TRUE(wpast < fmt::format(L"{:%Y-%m-%d %H:%M:%S}", now));
416 }
417
TEST(module_test,time_duration)418 TEST(module_test, time_duration) {
419 using us = std::chrono::duration<double, std::micro>;
420 EXPECT_EQ("42s", fmt::format("{}", std::chrono::seconds{42}));
421 EXPECT_EQ("4.2µs", fmt::format("{:3.1}", us{4.234}));
422 EXPECT_EQ("4.2µs", fmt::format(std::locale::classic(), "{:L}", us{4.2}));
423
424 EXPECT_EQ(L"42s", fmt::format(L"{}", std::chrono::seconds{42}));
425 EXPECT_EQ(L"4.2µs", fmt::format(L"{:3.1}", us{4.234}));
426 EXPECT_EQ(L"4.2µs", fmt::format(std::locale::classic(), L"{:L}", us{4.2}));
427 }
428
TEST(module_test,weekday)429 TEST(module_test, weekday) {
430 EXPECT_EQ("Mon", fmt::format(std::locale::classic(), "{}", fmt::weekday(1)));
431 }
432
TEST(module_test,printf)433 TEST(module_test, printf) {
434 EXPECT_WRITE(stdout, fmt::printf("%f", 42.123456), "42.123456");
435 EXPECT_WRITE(stdout, fmt::printf("%d", 42), "42");
436 EXPECT_WRITE(stdout, fmt::printf(L"%f", 42.123456), as_string(L"42.123456"));
437 EXPECT_WRITE(stdout, fmt::printf(L"%d", 42), as_string(L"42"));
438 }
439
TEST(module_test,fprintf)440 TEST(module_test, fprintf) {
441 EXPECT_WRITE(stderr, fmt::fprintf(stderr, "%d", 42), "42");
442 EXPECT_WRITE(stderr, fmt::fprintf(stderr, L"%d", 42), as_string(L"42"));
443 }
444
TEST(module_test,sprintf)445 TEST(module_test, sprintf) {
446 EXPECT_EQ("42", fmt::sprintf("%d", 42));
447 EXPECT_EQ(L"42", fmt::sprintf(L"%d", 42));
448 }
449
TEST(module_test,vprintf)450 TEST(module_test, vprintf) {
451 EXPECT_WRITE(stdout, fmt::vprintf("%d", fmt::make_printf_args(42)), "42");
452 EXPECT_WRITE(stdout, fmt::vprintf(L"%d", fmt::make_wprintf_args(42)),
453 as_string(L"42"));
454 }
455
TEST(module_test,vfprintf)456 TEST(module_test, vfprintf) {
457 auto args = fmt::make_printf_args(42);
458 EXPECT_WRITE(stderr, fmt::vfprintf(stderr, "%d", args), "42");
459 auto wargs = fmt::make_wprintf_args(42);
460 EXPECT_WRITE(stderr, fmt::vfprintf(stderr, L"%d", wargs), as_string(L"42"));
461 }
462
TEST(module_test,vsprintf)463 TEST(module_test, vsprintf) {
464 EXPECT_EQ("42", fmt::vsprintf("%d", fmt::make_printf_args(42)));
465 EXPECT_EQ(L"42", fmt::vsprintf(L"%d", fmt::make_wprintf_args(42)));
466 }
467
TEST(module_test,color)468 TEST(module_test, color) {
469 auto fg_check = fg(fmt::rgb(255, 200, 30));
470 auto bg_check = bg(fmt::color::dark_slate_gray) | fmt::emphasis::italic;
471 auto emphasis_check = fmt::emphasis::underline | fmt::emphasis::bold;
472 EXPECT_EQ("\x1B[30m42\x1B[0m",
473 fmt::format(fg(fmt::terminal_color::black), "{}", 42));
474 EXPECT_EQ(L"\x1B[30m42\x1B[0m",
475 fmt::format(fg(fmt::terminal_color::black), L"{}", 42));
476 }
477
TEST(module_test,cstring_view)478 TEST(module_test, cstring_view) {
479 auto s = "fmt";
480 EXPECT_EQ(s, fmt::cstring_view(s).c_str());
481 auto w = L"fmt";
482 EXPECT_EQ(w, fmt::wcstring_view(w).c_str());
483 }
484
TEST(module_test,buffered_file)485 TEST(module_test, buffered_file) {
486 EXPECT_TRUE(fmt::buffered_file{}.get() == nullptr);
487 }
488
TEST(module_test,output_file)489 TEST(module_test, output_file) {
490 #ifdef __clang__
491 fmt::println("\033[0;33m[=disabled=] {}\033[0;0m",
492 "Clang 16.0 emits multiple copies of vtables");
493 #else
494 fmt::ostream out = fmt::output_file("module-test", fmt::buffer_size = 1);
495 out.close();
496 #endif
497 }
498
499 struct custom_context {
500 using char_type = char;
501 using parse_context_type = fmt::format_parse_context;
502 };
503
TEST(module_test,custom_context)504 TEST(module_test, custom_context) {
505 fmt::basic_format_arg<custom_context> custom_arg;
506 EXPECT_TRUE(!custom_arg);
507 }
508
TEST(module_test,compile_format_string)509 TEST(module_test, compile_format_string) {
510 using namespace fmt::literals;
511 #ifdef __clang__
512 fmt::println("\033[0;33m[=disabled=] {}\033[0;0m",
513 "Clang 16.0 fails to import user-defined literals");
514 #else
515 EXPECT_EQ("42", fmt::format("{0:x}"_cf, 0x42));
516 EXPECT_EQ(L"42", fmt::format(L"{:}"_cf, 42));
517 EXPECT_EQ("4.2", fmt::format("{arg:3.1f}"_cf, "arg"_a = 4.2));
518 EXPECT_EQ(L" 42", fmt::format(L"{arg:>3}"_cf, L"arg"_a = L"42"));
519 #endif
520 }
521