src/test/test-time-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "random-util.h"
   4 #include "string-util.h"
   5 #include "strv.h"
   6 #include "time-util.h"
   7
   8 static void test_parse_sec(void) {
   9         usec_t u;
  10
  11         log_info("/* %s */", __func__);
  12
  13         assert_se(parse_sec("5s", &u) >= 0);
  14         assert_se(u == 5 * USEC_PER_SEC);
  15         assert_se(parse_sec("5s500ms", &u) >= 0);
  16         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  17         assert_se(parse_sec(" 5s 500ms  ", &u) >= 0);
  18         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  19         assert_se(parse_sec(" 5.5s  ", &u) >= 0);
  20         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  21         assert_se(parse_sec(" 5.5s 0.5ms ", &u) >= 0);
  22         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC + 500);
  23         assert_se(parse_sec(" .22s ", &u) >= 0);
  24         assert_se(u == 220 * USEC_PER_MSEC);
  25         assert_se(parse_sec(" .50y ", &u) >= 0);
  26         assert_se(u == USEC_PER_YEAR / 2);
  27         assert_se(parse_sec("2.5", &u) >= 0);
  28         assert_se(u == 2500 * USEC_PER_MSEC);
  29         assert_se(parse_sec(".7", &u) >= 0);
  30         assert_se(u == 700 * USEC_PER_MSEC);
  31         assert_se(parse_sec("23us", &u) >= 0);
  32         assert_se(u == 23);
  33         assert_se(parse_sec("23µs", &u) >= 0);
  34         assert_se(u == 23);
  35         assert_se(parse_sec("infinity", &u) >= 0);
  36         assert_se(u == USEC_INFINITY);
  37         assert_se(parse_sec(" infinity ", &u) >= 0);
  38         assert_se(u == USEC_INFINITY);
  39         assert_se(parse_sec("+3.1s", &u) >= 0);
  40         assert_se(u == 3100 * USEC_PER_MSEC);
  41
  42         assert_se(parse_sec(" xyz ", &u) < 0);
  43         assert_se(parse_sec("", &u) < 0);
  44         assert_se(parse_sec(" . ", &u) < 0);
  45         assert_se(parse_sec(" 5. ", &u) < 0);
  46         assert_se(parse_sec(".s ", &u) < 0);
  47         assert_se(parse_sec("-5s ", &u) < 0);
  48         assert_se(parse_sec("-0.3s ", &u) < 0);
  49         assert_se(parse_sec("-0.0s ", &u) < 0);
  50         assert_se(parse_sec("-0.-0s ", &u) < 0);
  51         assert_se(parse_sec("0.-0s ", &u) < 0);
  52         assert_se(parse_sec("3.-0s ", &u) < 0);
  53         assert_se(parse_sec(" infinity .7", &u) < 0);
  54         assert_se(parse_sec(".3 infinity", &u) < 0);
  55         assert_se(parse_sec("3.+1s", &u) < 0);
  56         assert_se(parse_sec("3. 1s", &u) < 0);
  57         assert_se(parse_sec("3.s", &u) < 0);
  58 }
  59
  60 static void test_parse_sec_fix_0(void) {
  61         usec_t u;
  62
  63         log_info("/* %s */", __func__);
  64
  65         assert_se(parse_sec_fix_0("5s", &u) >= 0);
  66         assert_se(u == 5 * USEC_PER_SEC);
  67         assert_se(parse_sec_fix_0("0s", &u) >= 0);
  68         assert_se(u == 0 * USEC_PER_SEC);
  69         assert_se(parse_sec_fix_0("0", &u) >= 0);
  70         assert_se(u == USEC_INFINITY);
  71         assert_se(parse_sec_fix_0(" 0", &u) >= 0);
  72         assert_se(u == USEC_INFINITY);
  73 }
  74
  75 static void test_parse_time(void) {
  76         usec_t u;
  77
  78         log_info("/* %s */", __func__);
  79
  80         assert_se(parse_time("5", &u, 1) >= 0);
  81         assert_se(u == 5);
  82
  83         assert_se(parse_time("5", &u, USEC_PER_MSEC) >= 0);
  84         assert_se(u == 5 * USEC_PER_MSEC);
  85
  86         assert_se(parse_time("5", &u, USEC_PER_SEC) >= 0);
  87         assert_se(u == 5 * USEC_PER_SEC);
  88
  89         assert_se(parse_time("5s", &u, 1) >= 0);
  90         assert_se(u == 5 * USEC_PER_SEC);
  91
  92         assert_se(parse_time("5s", &u, USEC_PER_SEC) >= 0);
  93         assert_se(u == 5 * USEC_PER_SEC);
  94
  95         assert_se(parse_time("5s", &u, USEC_PER_MSEC) >= 0);
  96         assert_se(u == 5 * USEC_PER_SEC);
  97 }
  98
  99 static void test_parse_nsec(void) {
 100         nsec_t u;
 101
 102         log_info("/* %s */", __func__);
 103
 104         assert_se(parse_nsec("5s", &u) >= 0);
 105         assert_se(u == 5 * NSEC_PER_SEC);
 106         assert_se(parse_nsec("5s500ms", &u) >= 0);
 107         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 108         assert_se(parse_nsec(" 5s 500ms  ", &u) >= 0);
 109         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 110         assert_se(parse_nsec(" 5.5s  ", &u) >= 0);
 111         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 112         assert_se(parse_nsec(" 5.5s 0.5ms ", &u) >= 0);
 113         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC + 500 * NSEC_PER_USEC);
 114         assert_se(parse_nsec(" .22s ", &u) >= 0);
 115         assert_se(u == 220 * NSEC_PER_MSEC);
 116         assert_se(parse_nsec(" .50y ", &u) >= 0);
 117         assert_se(u == NSEC_PER_YEAR / 2);
 118         assert_se(parse_nsec("2.5", &u) >= 0);
 119         assert_se(u == 2);
 120         assert_se(parse_nsec(".7", &u) >= 0);
 121         assert_se(u == 0);
 122         assert_se(parse_nsec("infinity", &u) >= 0);
 123         assert_se(u == NSEC_INFINITY);
 124         assert_se(parse_nsec(" infinity ", &u) >= 0);
 125         assert_se(u == NSEC_INFINITY);
 126         assert_se(parse_nsec("+3.1s", &u) >= 0);
 127         assert_se(u == 3100 * NSEC_PER_MSEC);
 128
 129         assert_se(parse_nsec(" xyz ", &u) < 0);
 130         assert_se(parse_nsec("", &u) < 0);
 131         assert_se(parse_nsec(" . ", &u) < 0);
 132         assert_se(parse_nsec(" 5. ", &u) < 0);
 133         assert_se(parse_nsec(".s ", &u) < 0);
 134         assert_se(parse_nsec(" infinity .7", &u) < 0);
 135         assert_se(parse_nsec(".3 infinity", &u) < 0);
 136         assert_se(parse_nsec("-5s ", &u) < 0);
 137         assert_se(parse_nsec("-0.3s ", &u) < 0);
 138         assert_se(parse_nsec("-0.0s ", &u) < 0);
 139         assert_se(parse_nsec("-0.-0s ", &u) < 0);
 140         assert_se(parse_nsec("0.-0s ", &u) < 0);
 141         assert_se(parse_nsec("3.-0s ", &u) < 0);
 142         assert_se(parse_nsec(" infinity .7", &u) < 0);
 143         assert_se(parse_nsec(".3 infinity", &u) < 0);
 144         assert_se(parse_nsec("3.+1s", &u) < 0);
 145         assert_se(parse_nsec("3. 1s", &u) < 0);
 146         assert_se(parse_nsec("3.s", &u) < 0);
 147 }
 148
 149 static void test_format_timespan_one(usec_t x, usec_t accuracy) {
 150         char l[FORMAT_TIMESPAN_MAX];
 151         const char *t;
 152         usec_t y;
 153
 154         log_info(USEC_FMT"     (at accuracy "USEC_FMT")", x, accuracy);
 155
 156         assert_se(t = format_timespan(l, sizeof l, x, accuracy));
 157         log_info(" = <%s>", t);
 158
 159         assert_se(parse_sec(t, &y) >= 0);
 160         log_info(" = "USEC_FMT, y);
 161
 162         if (accuracy <= 0)
 163                 accuracy = 1;
 164
 165         assert_se(x / accuracy == y / accuracy);
 166 }
 167
 168 static void test_format_timespan(usec_t accuracy) {
 169         log_info("/* %s accuracy="USEC_FMT" */", __func__, accuracy);
 170
 171         test_format_timespan_one(0, accuracy);
 172         test_format_timespan_one(1, accuracy);
 173         test_format_timespan_one(1*USEC_PER_SEC, accuracy);
 174         test_format_timespan_one(999*USEC_PER_MSEC, accuracy);
 175         test_format_timespan_one(1234567, accuracy);
 176         test_format_timespan_one(12, accuracy);
 177         test_format_timespan_one(123, accuracy);
 178         test_format_timespan_one(1234, accuracy);
 179         test_format_timespan_one(12345, accuracy);
 180         test_format_timespan_one(123456, accuracy);
 181         test_format_timespan_one(1234567, accuracy);
 182         test_format_timespan_one(12345678, accuracy);
 183         test_format_timespan_one(1200000, accuracy);
 184         test_format_timespan_one(1230000, accuracy);
 185         test_format_timespan_one(1230000, accuracy);
 186         test_format_timespan_one(1234000, accuracy);
 187         test_format_timespan_one(1234500, accuracy);
 188         test_format_timespan_one(1234560, accuracy);
 189         test_format_timespan_one(1234567, accuracy);
 190         test_format_timespan_one(986087, accuracy);
 191         test_format_timespan_one(500 * USEC_PER_MSEC, accuracy);
 192         test_format_timespan_one(9*USEC_PER_YEAR/5 - 23, accuracy);
 193         test_format_timespan_one(USEC_INFINITY, accuracy);
 194 }
 195
 196 static void test_timezone_is_valid(void) {
 197         log_info("/* %s */", __func__);
 198
 199         assert_se(timezone_is_valid("Europe/Berlin", LOG_ERR));
 200         assert_se(timezone_is_valid("Australia/Sydney", LOG_ERR));
 201         assert_se(!timezone_is_valid("Europe/Do not exist", LOG_ERR));
 202 }
 203
 204 static void test_get_timezones(void) {
 205         _cleanup_strv_free_ char **zones = NULL;
 206         int r;
 207         char **zone;
 208
 209         log_info("/* %s */", __func__);
 210
 211         r = get_timezones(&zones);
 212         assert_se(r == 0);
 213
 214         STRV_FOREACH(zone, zones)
 215                 assert_se(timezone_is_valid(*zone, LOG_ERR));
 216 }
 217
 218 static void test_usec_add(void) {
 219         log_info("/* %s */", __func__);
 220
 221         assert_se(usec_add(0, 0) == 0);
 222         assert_se(usec_add(1, 4) == 5);
 223         assert_se(usec_add(USEC_INFINITY, 5) == USEC_INFINITY);
 224         assert_se(usec_add(5, USEC_INFINITY) == USEC_INFINITY);
 225         assert_se(usec_add(USEC_INFINITY-5, 2) == USEC_INFINITY-3);
 226         assert_se(usec_add(USEC_INFINITY-2, 2) == USEC_INFINITY);
 227         assert_se(usec_add(USEC_INFINITY-1, 2) == USEC_INFINITY);
 228         assert_se(usec_add(USEC_INFINITY, 2) == USEC_INFINITY);
 229 }
 230
 231 static void test_usec_sub_unsigned(void) {
 232         log_info("/* %s */", __func__);
 233
 234         assert_se(usec_sub_unsigned(0, 0) == 0);
 235         assert_se(usec_sub_unsigned(0, 2) == 0);
 236         assert_se(usec_sub_unsigned(0, USEC_INFINITY) == 0);
 237         assert_se(usec_sub_unsigned(1, 0) == 1);
 238         assert_se(usec_sub_unsigned(1, 1) == 0);
 239         assert_se(usec_sub_unsigned(1, 2) == 0);
 240         assert_se(usec_sub_unsigned(1, 3) == 0);
 241         assert_se(usec_sub_unsigned(1, USEC_INFINITY) == 0);
 242         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 0) == USEC_INFINITY-1);
 243         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 1) == USEC_INFINITY-2);
 244         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 2) == USEC_INFINITY-3);
 245         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-2) == 1);
 246         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-1) == 0);
 247         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY) == 0);
 248         assert_se(usec_sub_unsigned(USEC_INFINITY, 0) == USEC_INFINITY);
 249         assert_se(usec_sub_unsigned(USEC_INFINITY, 1) == USEC_INFINITY);
 250         assert_se(usec_sub_unsigned(USEC_INFINITY, 2) == USEC_INFINITY);
 251         assert_se(usec_sub_unsigned(USEC_INFINITY, USEC_INFINITY) == USEC_INFINITY);
 252 }
 253
 254 static void test_usec_sub_signed(void) {
 255         log_info("/* %s */", __func__);
 256
 257         assert_se(usec_sub_signed(0, 0) == 0);
 258         assert_se(usec_sub_signed(4, 1) == 3);
 259         assert_se(usec_sub_signed(4, 4) == 0);
 260         assert_se(usec_sub_signed(4, 5) == 0);
 261         assert_se(usec_sub_signed(USEC_INFINITY-3, -3) == USEC_INFINITY);
 262         assert_se(usec_sub_signed(USEC_INFINITY-3, -3) == USEC_INFINITY);
 263         assert_se(usec_sub_signed(USEC_INFINITY-3, -4) == USEC_INFINITY);
 264         assert_se(usec_sub_signed(USEC_INFINITY-3, -5) == USEC_INFINITY);
 265         assert_se(usec_sub_signed(USEC_INFINITY, 5) == USEC_INFINITY);
 266 }
 267
 268 static void test_format_timestamp(void) {
 269         unsigned i;
 270
 271         log_info("/* %s */", __func__);
 272
 273         for (i = 0; i < 100; i++) {
 274                 char buf[MAX(FORMAT_TIMESTAMP_MAX, FORMAT_TIMESPAN_MAX)];
 275                 usec_t x, y;
 276
 277                 random_bytes(&x, sizeof(x));
 278                 x = x % (2147483600 * USEC_PER_SEC) + 1;
 279
 280                 assert_se(format_timestamp(buf, sizeof(buf), x));
 281                 log_info("%s", buf);
 282                 assert_se(parse_timestamp(buf, &y) >= 0);
 283                 assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
 284
 285                 assert_se(format_timestamp_utc(buf, sizeof(buf), x));
 286                 log_info("%s", buf);
 287                 assert_se(parse_timestamp(buf, &y) >= 0);
 288                 assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
 289
 290                 assert_se(format_timestamp_us(buf, sizeof(buf), x));
 291                 log_info("%s", buf);
 292                 assert_se(parse_timestamp(buf, &y) >= 0);
 293                 assert_se(x == y);
 294
 295                 assert_se(format_timestamp_us_utc(buf, sizeof(buf), x));
 296                 log_info("%s", buf);
 297                 assert_se(parse_timestamp(buf, &y) >= 0);
 298                 assert_se(x == y);
 299
 300                 assert_se(format_timestamp_relative(buf, sizeof(buf), x));
 301                 log_info("%s", buf);
 302                 assert_se(parse_timestamp(buf, &y) >= 0);
 303
 304                 /* The two calls above will run with a slightly different local time. Make sure we are in the same
 305                  * range however, but give enough leeway that this is unlikely to explode. And of course,
 306                  * format_timestamp_relative() scales the accuracy with the distance from the current time up to one
 307                  * month, cover for that too. */
 308                 assert_se(y > x ? y - x : x - y <= USEC_PER_MONTH + USEC_PER_DAY);
 309         }
 310 }
 311
 312 static void test_format_timestamp_utc_one(usec_t val, const char *result) {
 313         char buf[FORMAT_TIMESTAMP_MAX];
 314         const char *t;
 315
 316         t = format_timestamp_utc(buf, sizeof(buf), val);
 317         assert_se(streq_ptr(t, result));
 318 }
 319
 320 static void test_format_timestamp_utc(void) {
 321         log_info("/* %s */", __func__);
 322
 323         test_format_timestamp_utc_one(0, NULL);
 324         test_format_timestamp_utc_one(1, "Thu 1970-01-01 00:00:00 UTC");
 325         test_format_timestamp_utc_one(USEC_PER_SEC, "Thu 1970-01-01 00:00:01 UTC");
 326
 327 #if SIZEOF_TIME_T == 8
 328         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX, "Thu 9999-12-30 23:59:59 UTC");
 329         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX + 1, "--- XXXX-XX-XX XX:XX:XX");
 330 #elif SIZEOF_TIME_T == 4
 331         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX, "Tue 2038-01-19 03:14:07 UTC");
 332         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX + 1, "--- XXXX-XX-XX XX:XX:XX");
 333 #endif
 334
 335         test_format_timestamp_utc_one(USEC_INFINITY, NULL);
 336 }
 337
 338 static void test_dual_timestamp_deserialize(void) {
 339         int r;
 340         dual_timestamp t;
 341
 342         log_info("/* %s */", __func__);
 343
 344         r = dual_timestamp_deserialize("1234 5678", &t);
 345         assert_se(r == 0);
 346         assert_se(t.realtime == 1234);
 347         assert_se(t.monotonic == 5678);
 348
 349         r = dual_timestamp_deserialize("1234x 5678", &t);
 350         assert_se(r == -EINVAL);
 351
 352         r = dual_timestamp_deserialize("1234 5678y", &t);
 353         assert_se(r == -EINVAL);
 354
 355         r = dual_timestamp_deserialize("-1234 5678", &t);
 356         assert_se(r == -EINVAL);
 357
 358         r = dual_timestamp_deserialize("1234 -5678", &t);
 359         assert_se(r == -EINVAL);
 360
 361         /* Check that output wasn't modified. */
 362         assert_se(t.realtime == 1234);
 363         assert_se(t.monotonic == 5678);
 364
 365         r = dual_timestamp_deserialize("+123 567", &t);
 366         assert_se(r == 0);
 367         assert_se(t.realtime == 123);
 368         assert_se(t.monotonic == 567);
 369
 370         /* Check that we get "infinity" on overflow. */
 371         r = dual_timestamp_deserialize("18446744073709551617 0", &t);
 372         assert_se(r == 0);
 373         assert_se(t.realtime == USEC_INFINITY);
 374         assert_se(t.monotonic == 0);
 375 }
 376
 377 static void assert_similar(usec_t a, usec_t b) {
 378         usec_t d;
 379
 380         if (a > b)
 381                 d = a - b;
 382         else
 383                 d = b - a;
 384
 385         assert(d < 10*USEC_PER_SEC);
 386 }
 387
 388 static void test_usec_shift_clock(void) {
 389         usec_t rt, mn, bt;
 390
 391         log_info("/* %s */", __func__);
 392
 393         rt = now(CLOCK_REALTIME);
 394         mn = now(CLOCK_MONOTONIC);
 395         bt = now(clock_boottime_or_monotonic());
 396
 397         assert_se(usec_shift_clock(USEC_INFINITY, CLOCK_REALTIME, CLOCK_MONOTONIC) == USEC_INFINITY);
 398
 399         assert_similar(usec_shift_clock(rt + USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_MONOTONIC), mn + USEC_PER_HOUR);
 400         assert_similar(usec_shift_clock(rt + 2*USEC_PER_HOUR, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt + 2*USEC_PER_HOUR);
 401         assert_se(usec_shift_clock(rt + 3*USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_REALTIME_ALARM) == rt + 3*USEC_PER_HOUR);
 402
 403         assert_similar(usec_shift_clock(mn + 4*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_REALTIME_ALARM), rt + 4*USEC_PER_HOUR);
 404         assert_similar(usec_shift_clock(mn + 5*USEC_PER_HOUR, CLOCK_MONOTONIC, clock_boottime_or_monotonic()), bt + 5*USEC_PER_HOUR);
 405         assert_se(usec_shift_clock(mn + 6*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_MONOTONIC) == mn + 6*USEC_PER_HOUR);
 406
 407         assert_similar(usec_shift_clock(bt + 7*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_MONOTONIC), mn + 7*USEC_PER_HOUR);
 408         assert_similar(usec_shift_clock(bt + 8*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_REALTIME_ALARM), rt + 8*USEC_PER_HOUR);
 409         assert_se(usec_shift_clock(bt + 9*USEC_PER_HOUR, clock_boottime_or_monotonic(), clock_boottime_or_monotonic()) == bt + 9*USEC_PER_HOUR);
 410
 411         if (mn > USEC_PER_MINUTE) {
 412                 assert_similar(usec_shift_clock(rt - 30 * USEC_PER_SEC, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC), mn - 30 * USEC_PER_SEC);
 413                 assert_similar(usec_shift_clock(rt - 50 * USEC_PER_SEC, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt - 50 * USEC_PER_SEC);
 414         }
 415 }
 416
 417 static void test_in_utc_timezone(void) {
 418         log_info("/* %s */", __func__);
 419
 420         assert_se(setenv("TZ", ":UTC", 1) >= 0);
 421         assert_se(in_utc_timezone());
 422         assert_se(streq(tzname[0], "UTC"));
 423         assert_se(streq(tzname[1], "UTC"));
 424         assert_se(timezone == 0);
 425         assert_se(daylight == 0);
 426
 427         assert_se(setenv("TZ", "Europe/Berlin", 1) >= 0);
 428         assert_se(!in_utc_timezone());
 429         assert_se(streq(tzname[0], "CET"));
 430         assert_se(streq(tzname[1], "CEST"));
 431
 432         assert_se(unsetenv("TZ") >= 0);
 433 }
 434
 435 int main(int argc, char *argv[]) {
 436         uintmax_t x;
 437
 438         log_info("realtime=" USEC_FMT "\n"
 439                  "monotonic=" USEC_FMT "\n"
 440                  "boottime=" USEC_FMT "\n",
 441                  now(CLOCK_REALTIME),
 442                  now(CLOCK_MONOTONIC),
 443                  now(clock_boottime_or_monotonic()));
 444
 445         test_parse_sec();
 446         test_parse_sec_fix_0();
 447         test_parse_time();
 448         test_parse_nsec();
 449         test_format_timespan(1);
 450         test_format_timespan(USEC_PER_MSEC);
 451         test_format_timespan(USEC_PER_SEC);
 452         test_timezone_is_valid();
 453         test_get_timezones();
 454         test_usec_add();
 455         test_usec_sub_signed();
 456         test_usec_sub_unsigned();
 457         test_format_timestamp();
 458         test_format_timestamp_utc();
 459         test_dual_timestamp_deserialize();
 460         test_usec_shift_clock();
 461         test_in_utc_timezone();
 462
 463         /* Ensure time_t is signed */
 464         assert_cc((time_t) -1 < (time_t) 1);
 465
 466         /* Ensure TIME_T_MAX works correctly */
 467         x = (uintmax_t) TIME_T_MAX;
 468         x++;
 469         assert((time_t) x < 0);
 470
 471         return 0;
 472 }