text: /*
   *  Copyright (c) 2012 The WebRTC 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 in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #include <gtest/gtest.h>
  
  #include "webrtc/modules/remote_bitrate_estimator/bitrate_estimator.h"
  
  namespace {
  
  using webrtc::BitRateStats;
  
  class BitRateStatsTest : public ::testing::Test {
   protected:
    BitRateStatsTest() {};
    BitRateStats stats_;
  };
  
  TEST_F(BitRateStatsTest, TestStrictMode) {
    int64_t now_ms = 0;
    // Should be initialized to 0.
    EXPECT_EQ(0u, stats_.BitRate(now_ms));
    stats_.Update(1500, now_ms);
    // Expecting 24 kbps given a 500 ms window with one 1500 bytes packet.
    EXPECT_EQ(24000u, stats_.BitRate(now_ms));
    stats_.Init();
    // Expecting 0 after init.
    EXPECT_EQ(0u, stats_.BitRate(now_ms));
    for (int i = 0; i < 100000; ++i) {
      if (now_ms % 10 == 0) {
        stats_.Update(1500, now_ms);
      }
      // Approximately 1200 kbps expected. Not exact since when packets
      // are removed we will jump 10 ms to the next packet.
      if (now_ms > 0 && now_ms % 500 == 0) {
        EXPECT_NEAR(1200000u, stats_.BitRate(now_ms), 24000u);
      }
      now_ms += 1;
    }
    now_ms += 500;
    // The window is 2 seconds. If nothing has been received for that time
    // the estimate should be 0.
    EXPECT_EQ(0u, stats_.BitRate(now_ms));
  }
  }  // namespace
  