1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/congestion_controller/pcc/utility_function_unittest.cc b/third_party/libwebrtc/modules/congestion_controller/pcc/utility_function_unittest.cc
new file mode 100644
index 0000000000..19b2d15920
--- /dev/null
+++ b/third_party/libwebrtc/modules/congestion_controller/pcc/utility_function_unittest.cc
@@ -0,0 +1,113 @@
+/*
+ *  Copyright (c) 2018 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 "modules/congestion_controller/pcc/utility_function.h"
+
+#include <stddef.h>
+
+#include <cmath>
+#include <type_traits>
+#include <vector>
+
+#include "api/transport/network_types.h"
+#include "api/units/data_rate.h"
+#include "api/units/data_size.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace pcc {
+namespace test {
+namespace {
+constexpr double kLossCoefficient = 11.35;
+constexpr double kThroughputPower = 0.9;
+constexpr double kThroughputCoefficient = 1;
+constexpr double kDelayGradientNegativeBound = 10;
+
+const Timestamp kStartTime = Timestamp::Micros(0);
+const TimeDelta kPacketsDelta = TimeDelta::Millis(1);
+const TimeDelta kIntervalDuration = TimeDelta::Millis(100);
+const DataRate kSendingBitrate = DataRate::BitsPerSec(1000);
+
+const DataSize kDefaultDataSize = DataSize::Bytes(100);
+const TimeDelta kDefaultDelay = TimeDelta::Millis(100);
+
+std::vector<PacketResult> CreatePacketResults(
+    const std::vector<Timestamp>& packets_send_times,
+    const std::vector<Timestamp>& packets_received_times = {},
+    const std::vector<DataSize>& packets_sizes = {}) {
+  std::vector<PacketResult> packet_results;
+  PacketResult packet_result;
+  SentPacket sent_packet;
+  for (size_t i = 0; i < packets_send_times.size(); ++i) {
+    sent_packet.send_time = packets_send_times[i];
+    if (packets_sizes.empty()) {
+      sent_packet.size = kDefaultDataSize;
+    } else {
+      sent_packet.size = packets_sizes[i];
+    }
+    packet_result.sent_packet = sent_packet;
+    if (packets_received_times.empty()) {
+      packet_result.receive_time = packets_send_times[i] + kDefaultDelay;
+    } else {
+      packet_result.receive_time = packets_received_times[i];
+    }
+    packet_results.push_back(packet_result);
+  }
+  return packet_results;
+}
+
+}  // namespace
+
+TEST(PccVivaceUtilityFunctionTest,
+     UtilityIsThroughputTermIfAllRestCoefficientsAreZero) {
+  VivaceUtilityFunction utility_function(0, 0, kThroughputCoefficient,
+                                         kThroughputPower, 0,
+                                         kDelayGradientNegativeBound);
+  PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
+                                      kIntervalDuration);
+  monitor_interval.OnPacketsFeedback(CreatePacketResults(
+      {kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
+       kStartTime + 3 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
+      {kStartTime + kPacketsDelta + kDefaultDelay, Timestamp::PlusInfinity(),
+       kStartTime + kDefaultDelay + 3 * kPacketsDelta,
+       Timestamp::PlusInfinity()},
+      {kDefaultDataSize, kDefaultDataSize, kDefaultDataSize,
+       kDefaultDataSize}));
+  EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
+                   kThroughputCoefficient *
+                       std::pow(kSendingBitrate.bps(), kThroughputPower));
+}
+
+TEST(PccVivaceUtilityFunctionTest,
+     LossTermIsNonZeroIfLossCoefficientIsNonZero) {
+  VivaceUtilityFunction utility_function(
+      0, kLossCoefficient, kThroughputCoefficient, kThroughputPower, 0,
+      kDelayGradientNegativeBound);
+  PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
+                                      kIntervalDuration);
+  monitor_interval.OnPacketsFeedback(CreatePacketResults(
+      {kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
+       kStartTime + 5 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
+      {kStartTime + kDefaultDelay, Timestamp::PlusInfinity(),
+       kStartTime + kDefaultDelay, kStartTime + 3 * kIntervalDuration},
+      {}));
+  // The second packet was lost.
+  EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
+                   kThroughputCoefficient *
+                           std::pow(kSendingBitrate.bps(), kThroughputPower) -
+                       kLossCoefficient * kSendingBitrate.bps() *
+                           monitor_interval.GetLossRate());
+}
+
+}  // namespace test
+}  // namespace pcc
+}  // namespace webrtc