Refactor unit tests for the base library to use GTest.

test/base-unittests/platform/time-unittest.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/base/platform/time.h"
+
+#if V8_OS_POSIX
+#include <sys/time.h>
+#endif
+
+#if V8_OS_WIN
+#include "src/base/win32-headers.h"
+#endif
+
+#include "src/base/platform/elapsed-timer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace base {
+
+TEST(TimeDelta, FromAndIn) {
+  EXPECT_EQ(TimeDelta::FromDays(2), TimeDelta::FromHours(48));
+  EXPECT_EQ(TimeDelta::FromHours(3), TimeDelta::FromMinutes(180));
+  EXPECT_EQ(TimeDelta::FromMinutes(2), TimeDelta::FromSeconds(120));
+  EXPECT_EQ(TimeDelta::FromSeconds(2), TimeDelta::FromMilliseconds(2000));
+  EXPECT_EQ(TimeDelta::FromMilliseconds(2), TimeDelta::FromMicroseconds(2000));
+  EXPECT_EQ(static_cast<int>(13), TimeDelta::FromDays(13).InDays());
+  EXPECT_EQ(static_cast<int>(13), TimeDelta::FromHours(13).InHours());
+  EXPECT_EQ(static_cast<int>(13), TimeDelta::FromMinutes(13).InMinutes());
+  EXPECT_EQ(static_cast<int64_t>(13), TimeDelta::FromSeconds(13).InSeconds());
+  EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
+  EXPECT_EQ(static_cast<int64_t>(13),
+            TimeDelta::FromMilliseconds(13).InMilliseconds());
+  EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
+  EXPECT_EQ(static_cast<int64_t>(13),
+            TimeDelta::FromMicroseconds(13).InMicroseconds());
+}
+
+
+#if V8_OS_MACOSX
+TEST(TimeDelta, MachTimespec) {
+  TimeDelta null = TimeDelta();
+  EXPECT_EQ(null, TimeDelta::FromMachTimespec(null.ToMachTimespec()));
+  TimeDelta delta1 = TimeDelta::FromMilliseconds(42);
+  EXPECT_EQ(delta1, TimeDelta::FromMachTimespec(delta1.ToMachTimespec()));
+  TimeDelta delta2 = TimeDelta::FromDays(42);
+  EXPECT_EQ(delta2, TimeDelta::FromMachTimespec(delta2.ToMachTimespec()));
+}
+#endif
+
+
+TEST(Time, JsTime) {
+  Time t = Time::FromJsTime(700000.3);
+  EXPECT_EQ(700000.3, t.ToJsTime());
+}
+
+
+#if V8_OS_POSIX
+TEST(Time, Timespec) {
+  Time null;
+  EXPECT_TRUE(null.IsNull());
+  EXPECT_EQ(null, Time::FromTimespec(null.ToTimespec()));
+  Time now = Time::Now();
+  EXPECT_EQ(now, Time::FromTimespec(now.ToTimespec()));
+  Time now_sys = Time::NowFromSystemTime();
+  EXPECT_EQ(now_sys, Time::FromTimespec(now_sys.ToTimespec()));
+  Time unix_epoch = Time::UnixEpoch();
+  EXPECT_EQ(unix_epoch, Time::FromTimespec(unix_epoch.ToTimespec()));
+  Time max = Time::Max();
+  EXPECT_TRUE(max.IsMax());
+  EXPECT_EQ(max, Time::FromTimespec(max.ToTimespec()));
+}
+
+
+TEST(Time, Timeval) {
+  Time null;
+  EXPECT_TRUE(null.IsNull());
+  EXPECT_EQ(null, Time::FromTimeval(null.ToTimeval()));
+  Time now = Time::Now();
+  EXPECT_EQ(now, Time::FromTimeval(now.ToTimeval()));
+  Time now_sys = Time::NowFromSystemTime();
+  EXPECT_EQ(now_sys, Time::FromTimeval(now_sys.ToTimeval()));
+  Time unix_epoch = Time::UnixEpoch();
+  EXPECT_EQ(unix_epoch, Time::FromTimeval(unix_epoch.ToTimeval()));
+  Time max = Time::Max();
+  EXPECT_TRUE(max.IsMax());
+  EXPECT_EQ(max, Time::FromTimeval(max.ToTimeval()));
+}
+#endif
+
+
+#if V8_OS_WIN
+TEST(Time, Filetime) {
+  Time null;
+  EXPECT_TRUE(null.IsNull());
+  EXPECT_EQ(null, Time::FromFiletime(null.ToFiletime()));
+  Time now = Time::Now();
+  EXPECT_EQ(now, Time::FromFiletime(now.ToFiletime()));
+  Time now_sys = Time::NowFromSystemTime();
+  EXPECT_EQ(now_sys, Time::FromFiletime(now_sys.ToFiletime()));
+  Time unix_epoch = Time::UnixEpoch();
+  EXPECT_EQ(unix_epoch, Time::FromFiletime(unix_epoch.ToFiletime()));
+  Time max = Time::Max();
+  EXPECT_TRUE(max.IsMax());
+  EXPECT_EQ(max, Time::FromFiletime(max.ToFiletime()));
+}
+#endif
+
+
+namespace {
+
+template <typename T>
+static void ResolutionTest(T (*Now)(), TimeDelta target_granularity) {
+  // We're trying to measure that intervals increment in a VERY small amount
+  // of time -- according to the specified target granularity. Unfortunately,
+  // if we happen to have a context switch in the middle of our test, the
+  // context switch could easily exceed our limit. So, we iterate on this
+  // several times. As long as we're able to detect the fine-granularity
+  // timers at least once, then the test has succeeded.
+  static const TimeDelta kExpirationTimeout = TimeDelta::FromSeconds(1);
+  ElapsedTimer timer;
+  timer.Start();
+  TimeDelta delta;
+  do {
+    T start = Now();
+    T now = start;
+    // Loop until we can detect that the clock has changed. Non-HighRes timers
+    // will increment in chunks, i.e. 15ms. By spinning until we see a clock
+    // change, we detect the minimum time between measurements.
+    do {
+      now = Now();
+      delta = now - start;
+    } while (now <= start);
+    EXPECT_NE(static_cast<int64_t>(0), delta.InMicroseconds());
+  } while (delta > target_granularity && !timer.HasExpired(kExpirationTimeout));
+  EXPECT_LE(delta, target_granularity);
+}
+
+}
+
+
+TEST(Time, NowResolution) {
+  // We assume that Time::Now() has at least 16ms resolution.
+  static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
+  ResolutionTest<Time>(&Time::Now, kTargetGranularity);
+}
+
+
+TEST(TimeTicks, NowResolution) {
+  // We assume that TimeTicks::Now() has at least 16ms resolution.
+  static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
+  ResolutionTest<TimeTicks>(&TimeTicks::Now, kTargetGranularity);
+}
+
+
+TEST(TimeTicks, HighResolutionNowResolution) {
+  if (!TimeTicks::IsHighResolutionClockWorking()) return;
+
+  // We assume that TimeTicks::HighResolutionNow() has sub-ms resolution.
+  static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(1);
+  ResolutionTest<TimeTicks>(&TimeTicks::HighResolutionNow, kTargetGranularity);
+}
+
+
+TEST(TimeTicks, IsMonotonic) {
+  TimeTicks previous_normal_ticks;
+  TimeTicks previous_highres_ticks;
+  ElapsedTimer timer;
+  timer.Start();
+  while (!timer.HasExpired(TimeDelta::FromMilliseconds(100))) {
+    TimeTicks normal_ticks = TimeTicks::Now();
+    TimeTicks highres_ticks = TimeTicks::HighResolutionNow();
+    EXPECT_GE(normal_ticks, previous_normal_ticks);
+    EXPECT_GE((normal_ticks - previous_normal_ticks).InMicroseconds(), 0);
+    EXPECT_GE(highres_ticks, previous_highres_ticks);
+    EXPECT_GE((highres_ticks - previous_highres_ticks).InMicroseconds(), 0);
+    previous_normal_ticks = normal_ticks;
+    previous_highres_ticks = highres_ticks;
+  }
+}
+
+}  // namespace base
+}  // namespace v8