Provision to start base::SimpleTestTickClock at initial ticks

media/cast/net/rtp/receiver_stats_unittest.cc

 // Copyright 2014 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 <gtest/gtest.h>
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/time/time.h"
 #include "media/cast/net/rtp/receiver_stats.h"
 #include "media/cast/net/rtp/rtp_defines.h"
 
 namespace media {
 namespace cast {
 
 static const int64_t kStartMillisecond = INT64_C(12345678900000);
 static const uint32_t kStdTimeIncrementMs = 33;
 
 class ReceiverStatsTest : public ::testing::Test {
  protected:
   ReceiverStatsTest()
-      : stats_(&testing_clock_) {
-    testing_clock_.Advance(
-        base::TimeDelta::FromMilliseconds(kStartMillisecond));
+      : stats_(&testing_clock_),
+        testing_clock_(base::TimeTicks() +
+                       base::TimeDelta::FromMilliseconds(kStartMillisecond)) {
     start_time_ = testing_clock_.NowTicks();
     delta_increments_ = base::TimeDelta::FromMilliseconds(kStdTimeIncrementMs);
   }
   ~ReceiverStatsTest() override {}
 
   uint32_t ExpectedJitter(uint32_t const_interval, int num_packets) {
     float jitter = 0;
     // Assume timestamps have a constant kStdTimeIncrementMs interval.
     float float_interval =
         static_cast<float>(const_interval - kStdTimeIncrementMs);
@@ skipping 108 matching lines @@
   EXPECT_FALSE(s.cumulative_lost);
   // Build extended sequence number (one wrap cycle).
   const uint32_t extended_seq_num = rtp_header_.sequence_number - 1;
   EXPECT_EQ(extended_seq_num, s.extended_high_sequence_number);
   EXPECT_EQ(ExpectedJitter(kStdTimeIncrementMs + kAdditionalIncrement, 300),
             s.jitter);
 }
 
 }  // namespace cast
 }  // namespace media