New ProbingCalculator class.

webrtc/modules/congestion_controller/probing_calculator_unittest.cc

+/*
+ *  Copyright (c) 2016 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 "webrtc/modules/congestion_controller/probing_calculator.h"
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h"
+
+namespace webrtc {
+
+class MockAimdRateControl : public AimdRateControl {
+ public:
+  MOCK_METHOD2(SetEstimate, void(int bitrate_bps, int64_t now_ms));
+};
+
+class TestProbingCalculator : public ::testing::Test {
+ public:
+  TestProbingCalculator() : probing_calculator_(&rate_controller_) {}
+
+  void AddPacketFeedback(int probe_cluster_id,
+                         size_t size,
+                         int64_t send_time_ms,
+                         int64_t arrival_time_ms) {
+    PacketInfo info(arrival_time_ms, send_time_ms, 0, size, probe_cluster_id);
+    probing_calculator_.PacketFeedback(info);
+  }
+
+ protected:
+  testing::StrictMock<MockAimdRateControl> rate_controller_;
+  ProbingCalculator probing_calculator_;
+};
+
+TEST_F(TestProbingCalculator, OneCluster) {
+  EXPECT_CALL(rate_controller_, SetEstimate(100000, 50));
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 20);
+  AddPacketFeedback(0, 1000, 20, 30);
+  AddPacketFeedback(0, 1000, 40, 50);
+}
+
+TEST_F(TestProbingCalculator, FastReceive) {
+  EXPECT_CALL(rate_controller_, SetEstimate(100000, 50));
+  AddPacketFeedback(0, 1000, 0, 15);
+  AddPacketFeedback(0, 1000, 10, 30);
+  AddPacketFeedback(0, 1000, 20, 40);
+  AddPacketFeedback(0, 1000, 40, 50);
+}
+
+TEST_F(TestProbingCalculator, TooFastReceive) {
+  AddPacketFeedback(0, 1000, 0, 19);
+  AddPacketFeedback(0, 1000, 10, 30);
+  AddPacketFeedback(0, 1000, 20, 40);
+  AddPacketFeedback(0, 1000, 40, 50);
+}
+
+TEST_F(TestProbingCalculator, SlowReceive) {
+  EXPECT_CALL(rate_controller_, SetEstimate(40000, 110));
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 40);
+  AddPacketFeedback(0, 1000, 20, 70);
+  AddPacketFeedback(0, 1000, 40, 110);
+}
+
+TEST_F(TestProbingCalculator, BurstReceive) {
+  AddPacketFeedback(0, 1000, 0, 50);
+  AddPacketFeedback(0, 1000, 10, 50);
+  AddPacketFeedback(0, 1000, 20, 50);
+  AddPacketFeedback(0, 1000, 40, 50);
+}
+
+TEST_F(TestProbingCalculator, MultipleClusters) {
+  EXPECT_CALL(rate_controller_, SetEstimate(80000, 60));
+  EXPECT_CALL(rate_controller_, SetEstimate(100000, 60));
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 20);
+  AddPacketFeedback(0, 1000, 20, 30);
+  AddPacketFeedback(0, 1000, 40, 60);
+  AddPacketFeedback(0, 1000, 50, 60);
+
+  EXPECT_CALL(rate_controller_, SetEstimate(200000, 90));
+  AddPacketFeedback(1, 1000, 60, 70);
+  AddPacketFeedback(1, 1000, 65, 77);
+  AddPacketFeedback(1, 1000, 70, 84);
+  AddPacketFeedback(1, 1000, 75, 90);
+}
+
+TEST_F(TestProbingCalculator, OldProbe) {
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 20);
+  AddPacketFeedback(0, 1000, 20, 30);
+
+  EXPECT_CALL(rate_controller_, SetEstimate(200000, 90));
+  AddPacketFeedback(1, 1000, 60, 70);
+  AddPacketFeedback(1, 1000, 65, 77);
+  AddPacketFeedback(1, 1000, 70, 84);
+  AddPacketFeedback(1, 1000, 75, 90);
+
+  AddPacketFeedback(0, 1000, 40, 60);
+}
+
+}  // namespace webrtc