Change to calculate the real NTP in TimeTicks.

media/cast/cast_ntp_tick_clock_unittest.cc

+// Copyright 2013 The Chromium 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 "base/test/simple_test_tick_clock.h"
+#include "media/cast/cast_defines.h"
+#include "media/cast/cast_ntp_tick_clock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+namespace cast {
+
+class PeerCastNtpTickClock : public CastNtpTickClock {
+ public:
+  explicit PeerCastNtpTickClock() {}

[jar (doing other things), 2013/10/25 01:13:54]

nit: no need for explicit.

+
+  using CastNtpTickClock::SetTickClock;
+};
+
+class CastNtpTickClockTest : public ::testing::Test {
+ protected:
+  CastNtpTickClockTest() {}
+  virtual ~CastNtpTickClockTest() {}
+};
+
+// Note: This test will fail if the system clock is not between the years 2010
+// and 2030.
+TEST_F(CastNtpTickClockTest, Basic) {
+  const int64 kSecondsbetweenYear1900and2010 = GG_INT64_C(40176 * 24 * 60 * 60);
+  const int64 kSecondsbetweenYear1900and2030 = GG_INT64_C(47481 * 24 * 60 * 60);
+
+  CastNtpTickClock ntp_clock;
+  base::TimeTicks now_ticks = ntp_clock.NowTicks();
+  base::TimeTicks year_2010_in_ticks;
+  base::TimeTicks year_2030_in_ticks;
+  year_2010_in_ticks += base::TimeDelta::FromSeconds(
+      kSecondsbetweenYear1900and2010);
+  year_2030_in_ticks += base::TimeDelta::FromSeconds(
+      kSecondsbetweenYear1900and2030);
+
+  EXPECT_GT(now_ticks, year_2010_in_ticks);
+  EXPECT_LT(now_ticks, year_2030_in_ticks);
+}
+
+TEST_F(CastNtpTickClockTest, Advance) {
+  const int64 kAdvanceTime = 123;
+  PeerCastNtpTickClock ntp_clock;
+  base::SimpleTestTickClock testing_clock;
+  ntp_clock.SetTickClock(&testing_clock);
+  base::TimeTicks start_ticks = ntp_clock.NowTicks();
+  base::TimeDelta advance_time = base::TimeDelta::FromSeconds(kAdvanceTime);
+  testing_clock.Advance(advance_time);
+
+  EXPECT_EQ(ntp_clock.NowTicks(), start_ticks + advance_time);
+}
+
+}  // namespace cast
+}  // namespace media
+