base/time/time_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/time/time.h"
   6
   7 #include <time.h>
   8
   9 #include <limits>
  10 #include <string>
  11
  12 #include "base/compiler_specific.h"
  13 #include "base/logging.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/threading/platform_thread.h"
  16 #include "build/build_config.h"
  17 #include "testing/gtest/include/gtest/gtest.h"
  18
  19 namespace base {
  20
  21 namespace {
  22
  23 // Specialized test fixture allowing time strings without timezones to be
  24 // tested by comparing them to a known time in the local zone.
  25 // See also pr_time_unittests.cc
  26 class TimeTest : public testing::Test {
  27  protected:
  28   void SetUp() override {
  29     // Use mktime to get a time_t, and turn it into a PRTime by converting
  30     // seconds to microseconds.  Use 15th Oct 2007 12:45:00 local.  This
  31     // must be a time guaranteed to be outside of a DST fallback hour in
  32     // any timezone.
  33     struct tm local_comparison_tm = {
  34       0,            // second
  35       45,           // minute
  36       12,           // hour
  37       15,           // day of month
  38       10 - 1,       // month
  39       2007 - 1900,  // year
  40       0,            // day of week (ignored, output only)
  41       0,            // day of year (ignored, output only)
  42       -1            // DST in effect, -1 tells mktime to figure it out
  43     };
  44
  45     time_t converted_time = mktime(&local_comparison_tm);
  46     ASSERT_GT(converted_time, 0);
  47     comparison_time_local_ = Time::FromTimeT(converted_time);
  48
  49     // time_t representation of 15th Oct 2007 12:45:00 PDT
  50     comparison_time_pdt_ = Time::FromTimeT(1192477500);
  51   }
  52
  53   Time comparison_time_local_;
  54   Time comparison_time_pdt_;
  55 };
  56
  57 // Test conversions to/from time_t and exploding/unexploding.
  58 TEST_F(TimeTest, TimeT) {
  59   // C library time and exploded time.
  60   time_t now_t_1 = time(NULL);
  61   struct tm tms;
  62 #if defined(OS_WIN)
  63   localtime_s(&tms, &now_t_1);
  64 #elif defined(OS_POSIX)
  65   localtime_r(&now_t_1, &tms);
  66 #endif
  67
  68   // Convert to ours.
  69   Time our_time_1 = Time::FromTimeT(now_t_1);
  70   Time::Exploded exploded;
  71   our_time_1.LocalExplode(&exploded);
  72
  73   // This will test both our exploding and our time_t -> Time conversion.
  74   EXPECT_EQ(tms.tm_year + 1900, exploded.year);
  75   EXPECT_EQ(tms.tm_mon + 1, exploded.month);
  76   EXPECT_EQ(tms.tm_mday, exploded.day_of_month);
  77   EXPECT_EQ(tms.tm_hour, exploded.hour);
  78   EXPECT_EQ(tms.tm_min, exploded.minute);
  79   EXPECT_EQ(tms.tm_sec, exploded.second);
  80
  81   // Convert exploded back to the time struct.
  82   Time our_time_2 = Time::FromLocalExploded(exploded);
  83   EXPECT_TRUE(our_time_1 == our_time_2);
  84
  85   time_t now_t_2 = our_time_2.ToTimeT();
  86   EXPECT_EQ(now_t_1, now_t_2);
  87
  88   EXPECT_EQ(10, Time().FromTimeT(10).ToTimeT());
  89   EXPECT_EQ(10.0, Time().FromTimeT(10).ToDoubleT());
  90
  91   // Conversions of 0 should stay 0.
  92   EXPECT_EQ(0, Time().ToTimeT());
  93   EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
  94 }
  95
  96 // Test conversions to/from javascript time.
  97 TEST_F(TimeTest, JsTime) {
  98   Time epoch = Time::FromJsTime(0.0);
  99   EXPECT_EQ(epoch, Time::UnixEpoch());
 100   Time t = Time::FromJsTime(700000.3);
 101   EXPECT_EQ(700.0003, t.ToDoubleT());
 102   t = Time::FromDoubleT(800.73);
 103   EXPECT_EQ(800730.0, t.ToJsTime());
 104 }
 105
 106 #if defined(OS_POSIX)
 107 TEST_F(TimeTest, FromTimeVal) {
 108   Time now = Time::Now();
 109   Time also_now = Time::FromTimeVal(now.ToTimeVal());
 110   EXPECT_EQ(now, also_now);
 111 }
 112 #endif  // OS_POSIX
 113
 114 TEST_F(TimeTest, FromExplodedWithMilliseconds) {
 115   // Some platform implementations of FromExploded are liable to drop
 116   // milliseconds if we aren't careful.
 117   Time now = Time::NowFromSystemTime();
 118   Time::Exploded exploded1 = {0};
 119   now.UTCExplode(&exploded1);
 120   exploded1.millisecond = 500;
 121   Time time = Time::FromUTCExploded(exploded1);
 122   Time::Exploded exploded2 = {0};
 123   time.UTCExplode(&exploded2);
 124   EXPECT_EQ(exploded1.millisecond, exploded2.millisecond);
 125 }
 126
 127 TEST_F(TimeTest, ZeroIsSymmetric) {
 128   Time zero_time(Time::FromTimeT(0));
 129   EXPECT_EQ(0, zero_time.ToTimeT());
 130
 131   EXPECT_EQ(0.0, zero_time.ToDoubleT());
 132 }
 133
 134 TEST_F(TimeTest, LocalExplode) {
 135   Time a = Time::Now();
 136   Time::Exploded exploded;
 137   a.LocalExplode(&exploded);
 138
 139   Time b = Time::FromLocalExploded(exploded);
 140
 141   // The exploded structure doesn't have microseconds, and on Mac & Linux, the
 142   // internal OS conversion uses seconds, which will cause truncation. So we
 143   // can only make sure that the delta is within one second.
 144   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 145 }
 146
 147 TEST_F(TimeTest, UTCExplode) {
 148   Time a = Time::Now();
 149   Time::Exploded exploded;
 150   a.UTCExplode(&exploded);
 151
 152   Time b = Time::FromUTCExploded(exploded);
 153   EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
 154 }
 155
 156 TEST_F(TimeTest, LocalMidnight) {
 157   Time::Exploded exploded;
 158   Time::Now().LocalMidnight().LocalExplode(&exploded);
 159   EXPECT_EQ(0, exploded.hour);
 160   EXPECT_EQ(0, exploded.minute);
 161   EXPECT_EQ(0, exploded.second);
 162   EXPECT_EQ(0, exploded.millisecond);
 163 }
 164
 165 TEST_F(TimeTest, ParseTimeTest1) {
 166   time_t current_time = 0;
 167   time(&current_time);
 168
 169   const int BUFFER_SIZE = 64;
 170   struct tm local_time = {0};
 171   char time_buf[BUFFER_SIZE] = {0};
 172 #if defined(OS_WIN)
 173   localtime_s(&local_time, &current_time);
 174   asctime_s(time_buf, arraysize(time_buf), &local_time);
 175 #elif defined(OS_POSIX)
 176   localtime_r(&current_time, &local_time);
 177   asctime_r(&local_time, time_buf);
 178 #endif
 179
 180   Time parsed_time;
 181   EXPECT_TRUE(Time::FromString(time_buf, &parsed_time));
 182   EXPECT_EQ(current_time, parsed_time.ToTimeT());
 183 }
 184
 185 TEST_F(TimeTest, DayOfWeekSunday) {
 186   Time time;
 187   EXPECT_TRUE(Time::FromString("Sun, 06 May 2012 12:00:00 GMT", &time));
 188   Time::Exploded exploded;
 189   time.UTCExplode(&exploded);
 190   EXPECT_EQ(0, exploded.day_of_week);
 191 }
 192
 193 TEST_F(TimeTest, DayOfWeekWednesday) {
 194   Time time;
 195   EXPECT_TRUE(Time::FromString("Wed, 09 May 2012 12:00:00 GMT", &time));
 196   Time::Exploded exploded;
 197   time.UTCExplode(&exploded);
 198   EXPECT_EQ(3, exploded.day_of_week);
 199 }
 200
 201 TEST_F(TimeTest, DayOfWeekSaturday) {
 202   Time time;
 203   EXPECT_TRUE(Time::FromString("Sat, 12 May 2012 12:00:00 GMT", &time));
 204   Time::Exploded exploded;
 205   time.UTCExplode(&exploded);
 206   EXPECT_EQ(6, exploded.day_of_week);
 207 }
 208
 209 TEST_F(TimeTest, ParseTimeTest2) {
 210   Time parsed_time;
 211   EXPECT_TRUE(Time::FromString("Mon, 15 Oct 2007 19:45:00 GMT", &parsed_time));
 212   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 213 }
 214
 215 TEST_F(TimeTest, ParseTimeTest3) {
 216   Time parsed_time;
 217   EXPECT_TRUE(Time::FromString("15 Oct 07 12:45:00", &parsed_time));
 218   EXPECT_EQ(comparison_time_local_, parsed_time);
 219 }
 220
 221 TEST_F(TimeTest, ParseTimeTest4) {
 222   Time parsed_time;
 223   EXPECT_TRUE(Time::FromString("15 Oct 07 19:45 GMT", &parsed_time));
 224   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 225 }
 226
 227 TEST_F(TimeTest, ParseTimeTest5) {
 228   Time parsed_time;
 229   EXPECT_TRUE(Time::FromString("Mon Oct 15 12:45 PDT 2007", &parsed_time));
 230   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 231 }
 232
 233 TEST_F(TimeTest, ParseTimeTest6) {
 234   Time parsed_time;
 235   EXPECT_TRUE(Time::FromString("Monday, Oct 15, 2007 12:45 PM", &parsed_time));
 236   EXPECT_EQ(comparison_time_local_, parsed_time);
 237 }
 238
 239 TEST_F(TimeTest, ParseTimeTest7) {
 240   Time parsed_time;
 241   EXPECT_TRUE(Time::FromString("10/15/07 12:45:00 PM", &parsed_time));
 242   EXPECT_EQ(comparison_time_local_, parsed_time);
 243 }
 244
 245 TEST_F(TimeTest, ParseTimeTest8) {
 246   Time parsed_time;
 247   EXPECT_TRUE(Time::FromString("15-OCT-2007 12:45pm", &parsed_time));
 248   EXPECT_EQ(comparison_time_local_, parsed_time);
 249 }
 250
 251 TEST_F(TimeTest, ParseTimeTest9) {
 252   Time parsed_time;
 253   EXPECT_TRUE(Time::FromString("16 Oct 2007 4:45-JST (Tuesday)", &parsed_time));
 254   EXPECT_EQ(comparison_time_pdt_, parsed_time);
 255 }
 256
 257 TEST_F(TimeTest, ParseTimeTest10) {
 258   Time parsed_time;
 259   EXPECT_TRUE(Time::FromString("15/10/07 12:45", &parsed_time));
 260   EXPECT_EQ(parsed_time, comparison_time_local_);
 261 }
 262
 263 // Test some of edge cases around epoch, etc.
 264 TEST_F(TimeTest, ParseTimeTestEpoch0) {
 265   Time parsed_time;
 266
 267   // time_t == epoch == 0
 268   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:00 +0100 1970",
 269                                &parsed_time));
 270   EXPECT_EQ(0, parsed_time.ToTimeT());
 271   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:00 GMT 1970",
 272                                &parsed_time));
 273   EXPECT_EQ(0, parsed_time.ToTimeT());
 274 }
 275
 276 TEST_F(TimeTest, ParseTimeTestEpoch1) {
 277   Time parsed_time;
 278
 279   // time_t == 1 second after epoch == 1
 280   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:01 +0100 1970",
 281                                &parsed_time));
 282   EXPECT_EQ(1, parsed_time.ToTimeT());
 283   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:01 GMT 1970",
 284                                &parsed_time));
 285   EXPECT_EQ(1, parsed_time.ToTimeT());
 286 }
 287
 288 TEST_F(TimeTest, ParseTimeTestEpoch2) {
 289   Time parsed_time;
 290
 291   // time_t == 2 seconds after epoch == 2
 292   EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:02 +0100 1970",
 293                                &parsed_time));
 294   EXPECT_EQ(2, parsed_time.ToTimeT());
 295   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:02 GMT 1970",
 296                                &parsed_time));
 297   EXPECT_EQ(2, parsed_time.ToTimeT());
 298 }
 299
 300 TEST_F(TimeTest, ParseTimeTestEpochNeg1) {
 301   Time parsed_time;
 302
 303   // time_t == 1 second before epoch == -1
 304   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:59 +0100 1970",
 305                                &parsed_time));
 306   EXPECT_EQ(-1, parsed_time.ToTimeT());
 307   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 1969",
 308                                &parsed_time));
 309   EXPECT_EQ(-1, parsed_time.ToTimeT());
 310 }
 311
 312 // If time_t is 32 bits, a date after year 2038 will overflow time_t and
 313 // cause timegm() to return -1.  The parsed time should not be 1 second
 314 // before epoch.
 315 TEST_F(TimeTest, ParseTimeTestEpochNotNeg1) {
 316   Time parsed_time;
 317
 318   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 2100",
 319                                &parsed_time));
 320   EXPECT_NE(-1, parsed_time.ToTimeT());
 321 }
 322
 323 TEST_F(TimeTest, ParseTimeTestEpochNeg2) {
 324   Time parsed_time;
 325
 326   // time_t == 2 seconds before epoch == -2
 327   EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:58 +0100 1970",
 328                                &parsed_time));
 329   EXPECT_EQ(-2, parsed_time.ToTimeT());
 330   EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:58 GMT 1969",
 331                                &parsed_time));
 332   EXPECT_EQ(-2, parsed_time.ToTimeT());
 333 }
 334
 335 TEST_F(TimeTest, ParseTimeTestEpoch1960) {
 336   Time parsed_time;
 337
 338   // time_t before Epoch, in 1960
 339   EXPECT_TRUE(Time::FromString("Wed Jun 29 19:40:01 +0100 1960",
 340                                &parsed_time));
 341   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
 342   EXPECT_TRUE(Time::FromString("Wed Jun 29 18:40:01 GMT 1960",
 343                                &parsed_time));
 344   EXPECT_EQ(-299999999, parsed_time.ToTimeT());
 345   EXPECT_TRUE(Time::FromString("Wed Jun 29 17:40:01 GMT 1960",
 346                                &parsed_time));
 347   EXPECT_EQ(-300003599, parsed_time.ToTimeT());
 348 }
 349
 350 TEST_F(TimeTest, ParseTimeTestEmpty) {
 351   Time parsed_time;
 352   EXPECT_FALSE(Time::FromString("", &parsed_time));
 353 }
 354
 355 TEST_F(TimeTest, ParseTimeTestInvalidString) {
 356   Time parsed_time;
 357   EXPECT_FALSE(Time::FromString("Monday morning 2000", &parsed_time));
 358 }
 359
 360 TEST_F(TimeTest, ExplodeBeforeUnixEpoch) {
 361   static const int kUnixEpochYear = 1970;  // In case this changes (ha!).
 362   Time t;
 363   Time::Exploded exploded;
 364
 365   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1);
 366   t.UTCExplode(&exploded);
 367   EXPECT_TRUE(exploded.HasValidValues());
 368   // Should be 1969-12-31 23:59:59 999 milliseconds (and 999 microseconds).
 369   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 370   EXPECT_EQ(12, exploded.month);
 371   EXPECT_EQ(31, exploded.day_of_month);
 372   EXPECT_EQ(23, exploded.hour);
 373   EXPECT_EQ(59, exploded.minute);
 374   EXPECT_EQ(59, exploded.second);
 375   EXPECT_EQ(999, exploded.millisecond);
 376
 377   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1000);
 378   t.UTCExplode(&exploded);
 379   EXPECT_TRUE(exploded.HasValidValues());
 380   // Should be 1969-12-31 23:59:59 999 milliseconds.
 381   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 382   EXPECT_EQ(12, exploded.month);
 383   EXPECT_EQ(31, exploded.day_of_month);
 384   EXPECT_EQ(23, exploded.hour);
 385   EXPECT_EQ(59, exploded.minute);
 386   EXPECT_EQ(59, exploded.second);
 387   EXPECT_EQ(999, exploded.millisecond);
 388
 389   t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1001);
 390   t.UTCExplode(&exploded);
 391   EXPECT_TRUE(exploded.HasValidValues());
 392   // Should be 1969-12-31 23:59:59 998 milliseconds (and 999 microseconds).
 393   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 394   EXPECT_EQ(12, exploded.month);
 395   EXPECT_EQ(31, exploded.day_of_month);
 396   EXPECT_EQ(23, exploded.hour);
 397   EXPECT_EQ(59, exploded.minute);
 398   EXPECT_EQ(59, exploded.second);
 399   EXPECT_EQ(998, exploded.millisecond);
 400
 401   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1000);
 402   t.UTCExplode(&exploded);
 403   EXPECT_TRUE(exploded.HasValidValues());
 404   // Should be 1969-12-31 23:59:59.
 405   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 406   EXPECT_EQ(12, exploded.month);
 407   EXPECT_EQ(31, exploded.day_of_month);
 408   EXPECT_EQ(23, exploded.hour);
 409   EXPECT_EQ(59, exploded.minute);
 410   EXPECT_EQ(59, exploded.second);
 411   EXPECT_EQ(0, exploded.millisecond);
 412
 413   t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1001);
 414   t.UTCExplode(&exploded);
 415   EXPECT_TRUE(exploded.HasValidValues());
 416   // Should be 1969-12-31 23:59:58 999 milliseconds.
 417   EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
 418   EXPECT_EQ(12, exploded.month);
 419   EXPECT_EQ(31, exploded.day_of_month);
 420   EXPECT_EQ(23, exploded.hour);
 421   EXPECT_EQ(59, exploded.minute);
 422   EXPECT_EQ(58, exploded.second);
 423   EXPECT_EQ(999, exploded.millisecond);
 424
 425   // Make sure we still handle at/after Unix epoch correctly.
 426   t = Time::UnixEpoch();
 427   t.UTCExplode(&exploded);
 428   EXPECT_TRUE(exploded.HasValidValues());
 429   // Should be 1970-12-31 00:00:00 0 milliseconds.
 430   EXPECT_EQ(kUnixEpochYear, exploded.year);
 431   EXPECT_EQ(1, exploded.month);
 432   EXPECT_EQ(1, exploded.day_of_month);
 433   EXPECT_EQ(0, exploded.hour);
 434   EXPECT_EQ(0, exploded.minute);
 435   EXPECT_EQ(0, exploded.second);
 436   EXPECT_EQ(0, exploded.millisecond);
 437
 438   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1);
 439   t.UTCExplode(&exploded);
 440   EXPECT_TRUE(exploded.HasValidValues());
 441   // Should be 1970-01-01 00:00:00 0 milliseconds (and 1 microsecond).
 442   EXPECT_EQ(kUnixEpochYear, exploded.year);
 443   EXPECT_EQ(1, exploded.month);
 444   EXPECT_EQ(1, exploded.day_of_month);
 445   EXPECT_EQ(0, exploded.hour);
 446   EXPECT_EQ(0, exploded.minute);
 447   EXPECT_EQ(0, exploded.second);
 448   EXPECT_EQ(0, exploded.millisecond);
 449
 450   t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1000);
 451   t.UTCExplode(&exploded);
 452   EXPECT_TRUE(exploded.HasValidValues());
 453   // Should be 1970-01-01 00:00:00 1 millisecond.
 454   EXPECT_EQ(kUnixEpochYear, exploded.year);
 455   EXPECT_EQ(1, exploded.month);
 456   EXPECT_EQ(1, exploded.day_of_month);
 457   EXPECT_EQ(0, exploded.hour);
 458   EXPECT_EQ(0, exploded.minute);
 459   EXPECT_EQ(0, exploded.second);
 460   EXPECT_EQ(1, exploded.millisecond);
 461
 462   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1000);
 463   t.UTCExplode(&exploded);
 464   EXPECT_TRUE(exploded.HasValidValues());
 465   // Should be 1970-01-01 00:00:01.
 466   EXPECT_EQ(kUnixEpochYear, exploded.year);
 467   EXPECT_EQ(1, exploded.month);
 468   EXPECT_EQ(1, exploded.day_of_month);
 469   EXPECT_EQ(0, exploded.hour);
 470   EXPECT_EQ(0, exploded.minute);
 471   EXPECT_EQ(1, exploded.second);
 472   EXPECT_EQ(0, exploded.millisecond);
 473
 474   t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1001);
 475   t.UTCExplode(&exploded);
 476   EXPECT_TRUE(exploded.HasValidValues());
 477   // Should be 1970-01-01 00:00:01 1 millisecond.
 478   EXPECT_EQ(kUnixEpochYear, exploded.year);
 479   EXPECT_EQ(1, exploded.month);
 480   EXPECT_EQ(1, exploded.day_of_month);
 481   EXPECT_EQ(0, exploded.hour);
 482   EXPECT_EQ(0, exploded.minute);
 483   EXPECT_EQ(1, exploded.second);
 484   EXPECT_EQ(1, exploded.millisecond);
 485 }
 486
 487 TEST_F(TimeTest, TimeDeltaMax) {
 488   TimeDelta max = TimeDelta::Max();
 489   EXPECT_TRUE(max.is_max());
 490   EXPECT_EQ(max, TimeDelta::Max());
 491   EXPECT_GT(max, TimeDelta::FromDays(100 * 365));
 492   EXPECT_GT(max, TimeDelta());
 493 }
 494
 495 TEST_F(TimeTest, TimeDeltaMaxConversions) {
 496   TimeDelta t = TimeDelta::Max();
 497   EXPECT_EQ(std::numeric_limits<int64>::max(), t.ToInternalValue());
 498
 499   EXPECT_EQ(std::numeric_limits<int>::max(), t.InDays());
 500   EXPECT_EQ(std::numeric_limits<int>::max(), t.InHours());
 501   EXPECT_EQ(std::numeric_limits<int>::max(), t.InMinutes());
 502   EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InSecondsF());
 503   EXPECT_EQ(std::numeric_limits<int64>::max(), t.InSeconds());
 504   EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InMillisecondsF());
 505   EXPECT_EQ(std::numeric_limits<int64>::max(), t.InMilliseconds());
 506   EXPECT_EQ(std::numeric_limits<int64>::max(), t.InMillisecondsRoundedUp());
 507
 508   t = TimeDelta::FromDays(std::numeric_limits<int>::max());
 509   EXPECT_TRUE(t.is_max());
 510
 511   t = TimeDelta::FromHours(std::numeric_limits<int>::max());
 512   EXPECT_TRUE(t.is_max());
 513
 514   t = TimeDelta::FromMinutes(std::numeric_limits<int>::max());
 515   EXPECT_TRUE(t.is_max());
 516
 517   t = TimeDelta::FromSeconds(std::numeric_limits<int64>::max());
 518   EXPECT_TRUE(t.is_max());
 519
 520   t = TimeDelta::FromMilliseconds(std::numeric_limits<int64>::max());
 521   EXPECT_TRUE(t.is_max());
 522
 523   t = TimeDelta::FromSecondsD(std::numeric_limits<double>::infinity());
 524   EXPECT_TRUE(t.is_max());
 525
 526   t = TimeDelta::FromMillisecondsD(std::numeric_limits<double>::infinity());
 527   EXPECT_TRUE(t.is_max());
 528
 529   t = TimeDelta::FromMicroseconds(std::numeric_limits<int64>::max());
 530   EXPECT_TRUE(t.is_max());
 531 }
 532
 533 TEST_F(TimeTest, Max) {
 534   Time max = Time::Max();
 535   EXPECT_TRUE(max.is_max());
 536   EXPECT_EQ(max, Time::Max());
 537   EXPECT_GT(max, Time::Now());
 538   EXPECT_GT(max, Time());
 539 }
 540
 541 TEST_F(TimeTest, MaxConversions) {
 542   Time t = Time::Max();
 543   EXPECT_EQ(std::numeric_limits<int64>::max(), t.ToInternalValue());
 544
 545   t = Time::FromDoubleT(std::numeric_limits<double>::infinity());
 546   EXPECT_TRUE(t.is_max());
 547   EXPECT_EQ(std::numeric_limits<double>::infinity(), t.ToDoubleT());
 548
 549   t = Time::FromJsTime(std::numeric_limits<double>::infinity());
 550   EXPECT_TRUE(t.is_max());
 551   EXPECT_EQ(std::numeric_limits<double>::infinity(), t.ToJsTime());
 552
 553   t = Time::FromTimeT(std::numeric_limits<time_t>::max());
 554   EXPECT_TRUE(t.is_max());
 555   EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());
 556
 557 #if defined(OS_POSIX)
 558   struct timeval tval;
 559   tval.tv_sec = std::numeric_limits<time_t>::max();
 560   tval.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
 561   t = Time::FromTimeVal(tval);
 562   EXPECT_TRUE(t.is_max());
 563   tval = t.ToTimeVal();
 564   EXPECT_EQ(std::numeric_limits<time_t>::max(), tval.tv_sec);
 565   EXPECT_EQ(static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1,
 566       tval.tv_usec);
 567 #endif
 568
 569 #if defined(OS_MACOSX)
 570   t = Time::FromCFAbsoluteTime(std::numeric_limits<CFAbsoluteTime>::infinity());
 571   EXPECT_TRUE(t.is_max());
 572   EXPECT_EQ(std::numeric_limits<CFAbsoluteTime>::infinity(),
 573             t.ToCFAbsoluteTime());
 574 #endif
 575
 576 #if defined(OS_WIN)
 577   FILETIME ftime;
 578   ftime.dwHighDateTime = std::numeric_limits<DWORD>::max();
 579   ftime.dwLowDateTime = std::numeric_limits<DWORD>::max();
 580   t = Time::FromFileTime(ftime);
 581   EXPECT_TRUE(t.is_max());
 582   ftime = t.ToFileTime();
 583   EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwHighDateTime);
 584   EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwLowDateTime);
 585 #endif
 586 }
 587
 588 #if defined(OS_MACOSX)
 589 TEST_F(TimeTest, TimeTOverflow) {
 590   Time t = Time::FromInternalValue(std::numeric_limits<int64>::max() - 1);
 591   EXPECT_FALSE(t.is_max());
 592   EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());
 593 }
 594 #endif
 595
 596 #if defined(OS_ANDROID)
 597 TEST_F(TimeTest, FromLocalExplodedCrashOnAndroid) {
 598   // This crashed inside Time:: FromLocalExploded() on Android 4.1.2.
 599   // See http://crbug.com/287821
 600   Time::Exploded midnight = {2013,  // year
 601                              10,    // month
 602                              0,     // day_of_week
 603                              13,    // day_of_month
 604                              0,     // hour
 605                              0,     // minute
 606                              0,     // second
 607   };
 608   // The string passed to putenv() must be a char* and the documentation states
 609   // that it 'becomes part of the environment', so use a static buffer.
 610   static char buffer[] = "TZ=America/Santiago";
 611   putenv(buffer);
 612   tzset();
 613   Time t = Time::FromLocalExploded(midnight);
 614   EXPECT_EQ(1381633200, t.ToTimeT());
 615 }
 616 #endif  // OS_ANDROID
 617
 618 TEST(TimeTicks, Deltas) {
 619   for (int index = 0; index < 50; index++) {
 620     TimeTicks ticks_start = TimeTicks::Now();
 621     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
 622     TimeTicks ticks_stop = TimeTicks::Now();
 623     TimeDelta delta = ticks_stop - ticks_start;
 624     // Note:  Although we asked for a 10ms sleep, if the
 625     // time clock has a finer granularity than the Sleep()
 626     // clock, it is quite possible to wakeup early.  Here
 627     // is how that works:
 628     //      Time(ms timer)      Time(us timer)
 629     //          5                   5010
 630     //          6                   6010
 631     //          7                   7010
 632     //          8                   8010
 633     //          9                   9000
 634     // Elapsed  4ms                 3990us
 635     //
 636     // Unfortunately, our InMilliseconds() function truncates
 637     // rather than rounds.  We should consider fixing this
 638     // so that our averages come out better.
 639     EXPECT_GE(delta.InMilliseconds(), 9);
 640     EXPECT_GE(delta.InMicroseconds(), 9000);
 641     EXPECT_EQ(delta.InSeconds(), 0);
 642   }
 643 }
 644
 645 static void HighResClockTest(TimeTicks (*GetTicks)()) {
 646   // IsHighResolution() is false on some systems.  Since the product still works
 647   // even if it's false, it makes this entire test questionable.
 648   if (!TimeTicks::IsHighResolution())
 649     return;
 650
 651   // Why do we loop here?
 652   // We're trying to measure that intervals increment in a VERY small amount
 653   // of time --  less than 15ms.  Unfortunately, if we happen to have a
 654   // context switch in the middle of our test, the context switch could easily
 655   // exceed our limit.  So, we iterate on this several times.  As long as we're
 656   // able to detect the fine-granularity timers at least once, then the test
 657   // has succeeded.
 658
 659   const int kTargetGranularityUs = 15000;  // 15ms
 660
 661   bool success = false;
 662   int retries = 100;  // Arbitrary.
 663   TimeDelta delta;
 664   while (!success && retries--) {
 665     TimeTicks ticks_start = GetTicks();
 666     // Loop until we can detect that the clock has changed.  Non-HighRes timers
 667     // will increment in chunks, e.g. 15ms.  By spinning until we see a clock
 668     // change, we detect the minimum time between measurements.
 669     do {
 670       delta = GetTicks() - ticks_start;
 671     } while (delta.InMilliseconds() == 0);
 672
 673     if (delta.InMicroseconds() <= kTargetGranularityUs)
 674       success = true;
 675   }
 676
 677   // In high resolution mode, we expect to see the clock increment
 678   // in intervals less than 15ms.
 679   EXPECT_TRUE(success);
 680 }
 681
 682 TEST(TimeTicks, HighRes) {
 683   HighResClockTest(&TimeTicks::Now);
 684 }
 685
 686 // Fails frequently on Android http://crbug.com/352633 with:
 687 // Expected: (delta_thread.InMicroseconds()) > (0), actual: 0 vs 0
 688 #if defined(OS_ANDROID)
 689 #define MAYBE_ThreadNow DISABLED_ThreadNow
 690 #else
 691 #define MAYBE_ThreadNow ThreadNow
 692 #endif
 693 TEST(TimeTicks, MAYBE_ThreadNow) {
 694   if (TimeTicks::IsThreadNowSupported()) {
 695     TimeTicks begin = TimeTicks::Now();
 696     TimeTicks begin_thread = TimeTicks::ThreadNow();
 697     // Make sure that ThreadNow value is non-zero.
 698     EXPECT_GT(begin_thread, TimeTicks());
 699     // Sleep for 10 milliseconds to get the thread de-scheduled.
 700     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
 701     TimeTicks end_thread = TimeTicks::ThreadNow();
 702     TimeTicks end = TimeTicks::Now();
 703     TimeDelta delta = end - begin;
 704     TimeDelta delta_thread = end_thread - begin_thread;
 705     // Make sure that some thread time have elapsed.
 706     EXPECT_GT(delta_thread.InMicroseconds(), 0);
 707     // But the thread time is at least 9ms less than clock time.
 708     TimeDelta difference = delta - delta_thread;
 709     EXPECT_GE(difference.InMicroseconds(), 9000);
 710   }
 711 }
 712
 713 TEST(TimeTicks, NowFromSystemTraceTime) {
 714   // Re-use HighRes test for now since clock properties are identical.
 715   HighResClockTest(&TimeTicks::NowFromSystemTraceTime);
 716 }
 717
 718 TEST(TimeTicks, SnappedToNextTickBasic) {
 719   base::TimeTicks phase = base::TimeTicks::FromInternalValue(4000);
 720   base::TimeDelta interval = base::TimeDelta::FromInternalValue(1000);
 721   base::TimeTicks timestamp;
 722
 723   // Timestamp in previous interval.
 724   timestamp = base::TimeTicks::FromInternalValue(3500);
 725   EXPECT_EQ(4000,
 726             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 727
 728   // Timestamp in next interval.
 729   timestamp = base::TimeTicks::FromInternalValue(4500);
 730   EXPECT_EQ(5000,
 731             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 732
 733   // Timestamp multiple intervals before.
 734   timestamp = base::TimeTicks::FromInternalValue(2500);
 735   EXPECT_EQ(3000,
 736             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 737
 738   // Timestamp multiple intervals after.
 739   timestamp = base::TimeTicks::FromInternalValue(6500);
 740   EXPECT_EQ(7000,
 741             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 742
 743   // Timestamp on previous interval.
 744   timestamp = base::TimeTicks::FromInternalValue(3000);
 745   EXPECT_EQ(3000,
 746             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 747
 748   // Timestamp on next interval.
 749   timestamp = base::TimeTicks::FromInternalValue(5000);
 750   EXPECT_EQ(5000,
 751             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 752
 753   // Timestamp equal to phase.
 754   timestamp = base::TimeTicks::FromInternalValue(4000);
 755   EXPECT_EQ(4000,
 756             timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 757 }
 758
 759 TEST(TimeTicks, SnappedToNextTickOverflow) {
 760   // int(big_timestamp / interval) < 0, so this causes a crash if the number of
 761   // intervals elapsed is attempted to be stored in an int.
 762   base::TimeTicks phase = base::TimeTicks::FromInternalValue(0);
 763   base::TimeDelta interval = base::TimeDelta::FromInternalValue(4000);
 764   base::TimeTicks big_timestamp =
 765       base::TimeTicks::FromInternalValue(8635916564000);
 766
 767   EXPECT_EQ(8635916564000,
 768             big_timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
 769   EXPECT_EQ(8635916564000,
 770             big_timestamp.SnappedToNextTick(big_timestamp, interval)
 771                 .ToInternalValue());
 772 }
 773
 774 TEST(TimeDelta, FromAndIn) {
 775   EXPECT_TRUE(TimeDelta::FromDays(2) == TimeDelta::FromHours(48));
 776   EXPECT_TRUE(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180));
 777   EXPECT_TRUE(TimeDelta::FromMinutes(2) == TimeDelta::FromSeconds(120));
 778   EXPECT_TRUE(TimeDelta::FromSeconds(2) == TimeDelta::FromMilliseconds(2000));
 779   EXPECT_TRUE(TimeDelta::FromMilliseconds(2) ==
 780               TimeDelta::FromMicroseconds(2000));
 781   EXPECT_TRUE(TimeDelta::FromSecondsD(2.3) ==
 782               TimeDelta::FromMilliseconds(2300));
 783   EXPECT_TRUE(TimeDelta::FromMillisecondsD(2.5) ==
 784               TimeDelta::FromMicroseconds(2500));
 785   EXPECT_EQ(13, TimeDelta::FromDays(13).InDays());
 786   EXPECT_EQ(13, TimeDelta::FromHours(13).InHours());
 787   EXPECT_EQ(13, TimeDelta::FromMinutes(13).InMinutes());
 788   EXPECT_EQ(13, TimeDelta::FromSeconds(13).InSeconds());
 789   EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
 790   EXPECT_EQ(13, TimeDelta::FromMilliseconds(13).InMilliseconds());
 791   EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
 792   EXPECT_EQ(13, TimeDelta::FromSecondsD(13.1).InSeconds());
 793   EXPECT_EQ(13.1, TimeDelta::FromSecondsD(13.1).InSecondsF());
 794   EXPECT_EQ(13, TimeDelta::FromMillisecondsD(13.3).InMilliseconds());
 795   EXPECT_EQ(13.3, TimeDelta::FromMillisecondsD(13.3).InMillisecondsF());
 796   EXPECT_EQ(13, TimeDelta::FromMicroseconds(13).InMicroseconds());
 797 }
 798
 799 #if defined(OS_POSIX)
 800 TEST(TimeDelta, TimeSpecConversion) {
 801   struct timespec result = TimeDelta::FromSeconds(0).ToTimeSpec();
 802   EXPECT_EQ(result.tv_sec, 0);
 803   EXPECT_EQ(result.tv_nsec, 0);
 804
 805   result = TimeDelta::FromSeconds(1).ToTimeSpec();
 806   EXPECT_EQ(result.tv_sec, 1);
 807   EXPECT_EQ(result.tv_nsec, 0);
 808
 809   result = TimeDelta::FromMicroseconds(1).ToTimeSpec();
 810   EXPECT_EQ(result.tv_sec, 0);
 811   EXPECT_EQ(result.tv_nsec, 1000);
 812
 813   result = TimeDelta::FromMicroseconds(
 814       Time::kMicrosecondsPerSecond + 1).ToTimeSpec();
 815   EXPECT_EQ(result.tv_sec, 1);
 816   EXPECT_EQ(result.tv_nsec, 1000);
 817 }
 818 #endif  // OS_POSIX
 819
 820 // Our internal time format is serialized in things like databases, so it's
 821 // important that it's consistent across all our platforms.  We use the 1601
 822 // Windows epoch as the internal format across all platforms.
 823 TEST(TimeDelta, WindowsEpoch) {
 824   Time::Exploded exploded;
 825   exploded.year = 1970;
 826   exploded.month = 1;
 827   exploded.day_of_week = 0;  // Should be unusued.
 828   exploded.day_of_month = 1;
 829   exploded.hour = 0;
 830   exploded.minute = 0;
 831   exploded.second = 0;
 832   exploded.millisecond = 0;
 833   Time t = Time::FromUTCExploded(exploded);
 834   // Unix 1970 epoch.
 835   EXPECT_EQ(GG_INT64_C(11644473600000000), t.ToInternalValue());
 836
 837   // We can't test 1601 epoch, since the system time functions on Linux
 838   // only compute years starting from 1900.
 839 }
 840
 841 // We could define this separately for Time, TimeTicks and TimeDelta but the
 842 // definitions would be identical anyway.
 843 template <class Any>
 844 std::string AnyToString(Any any) {
 845   std::ostringstream oss;
 846   oss << any;
 847   return oss.str();
 848 }
 849
 850 TEST(TimeDelta, Magnitude) {
 851   const int64 zero = 0;
 852   EXPECT_EQ(TimeDelta::FromMicroseconds(zero),
 853             TimeDelta::FromMicroseconds(zero).magnitude());
 854
 855   const int64 one = 1;
 856   const int64 negative_one = -1;
 857   EXPECT_EQ(TimeDelta::FromMicroseconds(one),
 858             TimeDelta::FromMicroseconds(one).magnitude());
 859   EXPECT_EQ(TimeDelta::FromMicroseconds(one),
 860             TimeDelta::FromMicroseconds(negative_one).magnitude());
 861
 862   const int64 max_int64_minus_one = std::numeric_limits<int64>::max() - 1;
 863   const int64 min_int64_plus_two = std::numeric_limits<int64>::min() + 2;
 864   EXPECT_EQ(TimeDelta::FromMicroseconds(max_int64_minus_one),
 865             TimeDelta::FromMicroseconds(max_int64_minus_one).magnitude());
 866   EXPECT_EQ(TimeDelta::FromMicroseconds(max_int64_minus_one),
 867             TimeDelta::FromMicroseconds(min_int64_plus_two).magnitude());
 868 }
 869
 870
 871 TEST(TimeDelta, NumericOperators) {
 872   double d = 0.5;
 873   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 874             TimeDelta::FromMilliseconds(1000) * d);
 875   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 876             TimeDelta::FromMilliseconds(1000) / d);
 877   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 878             TimeDelta::FromMilliseconds(1000) *= d);
 879   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 880             TimeDelta::FromMilliseconds(1000) /= d);
 881   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 882             d * TimeDelta::FromMilliseconds(1000));
 883
 884   float f = 0.5;
 885   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 886             TimeDelta::FromMilliseconds(1000) * f);
 887   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 888             TimeDelta::FromMilliseconds(1000) / f);
 889   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 890             TimeDelta::FromMilliseconds(1000) *= f);
 891   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 892             TimeDelta::FromMilliseconds(1000) /= f);
 893   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 894             f * TimeDelta::FromMilliseconds(1000));
 895
 896
 897   int i = 2;
 898   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 899             TimeDelta::FromMilliseconds(1000) * i);
 900   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 901             TimeDelta::FromMilliseconds(1000) / i);
 902   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 903             TimeDelta::FromMilliseconds(1000) *= i);
 904   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 905             TimeDelta::FromMilliseconds(1000) /= i);
 906   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 907             i * TimeDelta::FromMilliseconds(1000));
 908
 909   int64_t i64 = 2;
 910   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 911             TimeDelta::FromMilliseconds(1000) * i64);
 912   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 913             TimeDelta::FromMilliseconds(1000) / i64);
 914   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 915             TimeDelta::FromMilliseconds(1000) *= i64);
 916   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 917             TimeDelta::FromMilliseconds(1000) /= i64);
 918   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 919             i64 * TimeDelta::FromMilliseconds(1000));
 920
 921
 922   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 923             TimeDelta::FromMilliseconds(1000) * 0.5);
 924   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 925             TimeDelta::FromMilliseconds(1000) / 0.5);
 926   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 927             TimeDelta::FromMilliseconds(1000) *= 0.5);
 928   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 929             TimeDelta::FromMilliseconds(1000) /= 0.5);
 930   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 931             0.5 * TimeDelta::FromMilliseconds(1000));
 932
 933   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 934             TimeDelta::FromMilliseconds(1000) * 2);
 935   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 936             TimeDelta::FromMilliseconds(1000) / 2);
 937   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 938             TimeDelta::FromMilliseconds(1000) *= 2);
 939   EXPECT_EQ(TimeDelta::FromMilliseconds(500),
 940             TimeDelta::FromMilliseconds(1000) /= 2);
 941   EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
 942             2 * TimeDelta::FromMilliseconds(1000));
 943 }
 944
 945 TEST(TimeDeltaLogging, DCheckEqCompiles) {
 946   DCHECK_EQ(TimeDelta(), TimeDelta());
 947 }
 948
 949 TEST(TimeDeltaLogging, EmptyIsZero) {
 950   TimeDelta zero;
 951   EXPECT_EQ("0s", AnyToString(zero));
 952 }
 953
 954 TEST(TimeDeltaLogging, FiveHundredMs) {
 955   TimeDelta five_hundred_ms = TimeDelta::FromMilliseconds(500);
 956   EXPECT_EQ("0.5s", AnyToString(five_hundred_ms));
 957 }
 958
 959 TEST(TimeDeltaLogging, MinusTenSeconds) {
 960   TimeDelta minus_ten_seconds = TimeDelta::FromSeconds(-10);
 961   EXPECT_EQ("-10s", AnyToString(minus_ten_seconds));
 962 }
 963
 964 TEST(TimeDeltaLogging, DoesNotMessUpFormattingFlags) {
 965   std::ostringstream oss;
 966   std::ios_base::fmtflags flags_before = oss.flags();
 967   oss << TimeDelta();
 968   EXPECT_EQ(flags_before, oss.flags());
 969 }
 970
 971 TEST(TimeDeltaLogging, DoesNotMakeStreamBad) {
 972   std::ostringstream oss;
 973   oss << TimeDelta();
 974   EXPECT_TRUE(oss.good());
 975 }
 976
 977 TEST(TimeLogging, DCheckEqCompiles) {
 978   DCHECK_EQ(Time(), Time());
 979 }
 980
 981 TEST(TimeLogging, ChromeBirthdate) {
 982   Time birthdate;
 983   ASSERT_TRUE(Time::FromString("Tue, 02 Sep 2008 09:42:18 GMT", &birthdate));
 984   EXPECT_EQ("2008-09-02 09:42:18.000 UTC", AnyToString(birthdate));
 985 }
 986
 987 TEST(TimeLogging, DoesNotMessUpFormattingFlags) {
 988   std::ostringstream oss;
 989   std::ios_base::fmtflags flags_before = oss.flags();
 990   oss << Time();
 991   EXPECT_EQ(flags_before, oss.flags());
 992 }
 993
 994 TEST(TimeLogging, DoesNotMakeStreamBad) {
 995   std::ostringstream oss;
 996   oss << Time();
 997   EXPECT_TRUE(oss.good());
 998 }
 999
1000 TEST(TimeTicksLogging, DCheckEqCompiles) {
1001   DCHECK_EQ(TimeTicks(), TimeTicks());
1002 }
1003
1004 TEST(TimeTicksLogging, ZeroTime) {
1005   TimeTicks zero;
1006   EXPECT_EQ("0 bogo-microseconds", AnyToString(zero));
1007 }
1008
1009 TEST(TimeTicksLogging, FortyYearsLater) {
1010   TimeTicks forty_years_later =
1011       TimeTicks() + TimeDelta::FromDays(365.25 * 40);
1012   EXPECT_EQ("1262304000000000 bogo-microseconds",
1013             AnyToString(forty_years_later));
1014 }
1015
1016 TEST(TimeTicksLogging, DoesNotMessUpFormattingFlags) {
1017   std::ostringstream oss;
1018   std::ios_base::fmtflags flags_before = oss.flags();
1019   oss << TimeTicks();
1020   EXPECT_EQ(flags_before, oss.flags());
1021 }
1022
1023 TEST(TimeTicksLogging, DoesNotMakeStreamBad) {
1024   std::ostringstream oss;
1025   oss << TimeTicks();
1026   EXPECT_TRUE(oss.good());
1027 }
1028
1029 }  // namespace
1030
1031 }  // namespace base