More Simulation Framework features

webrtc/modules/remote_bitrate_estimator/test/bwe_unittest.cc

+/*
+ *  Copyright (c) 2015 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/remote_bitrate_estimator/test/bwe.h"
+
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace webrtc {
+namespace testing {
+namespace bwe {
+
+const int kSetCapacity = 10000;
+
+class LinkedSetTest : public ::testing::Test {
+ public:
+  LinkedSetTest() : linked_set_(kSetCapacity) {}
+  ~LinkedSetTest() {}
+
+ protected:
+  LinkedSet linked_set_;
+};
+
+TEST_F(LinkedSetTest, EmptySet) {
+  EXPECT_EQ(linked_set_.OldestSeqNumber(), 0);
+  EXPECT_EQ(linked_set_.NewestSeqNumber(), 0);
+}
+
+TEST_F(LinkedSetTest, SinglePacket) {
+  const uint16_t kSeqNumber = 1;  // Arbitrary.
+  // Other parameters don't matter here.
+  linked_set_.Insert(kSeqNumber, 0, 0, 0);
+  EXPECT_EQ(linked_set_.OldestSeqNumber(), kSeqNumber);
+  EXPECT_EQ(linked_set_.NewestSeqNumber(), kSeqNumber);
+}
+
+TEST_F(LinkedSetTest, MultiplePackets) {
+  const uint16_t kNumberPackets = 100;
+
+  std::vector<uint16_t> sequence_numbers;
+  for (size_t i = 0; i < kNumberPackets; ++i) {
+    sequence_numbers.push_back(static_cast<uint16_t>(i + 1));
+  }
+  random_shuffle(sequence_numbers.begin(), sequence_numbers.end());
+
+  for (size_t i = 0; i < kNumberPackets; ++i) {
+    // Other parameters don't matter here.
+    linked_set_.Insert(static_cast<uint16_t>(i), 0, 0, 0);
+  }
+
+  // Packets arriving out of order should not affect the following values:
+  EXPECT_EQ(linked_set_.OldestSeqNumber(), 0);
+  EXPECT_EQ(linked_set_.NewestSeqNumber(), kNumberPackets - 1);
+}
+
+TEST_F(LinkedSetTest, Overflow) {
+  const int kFirstSeqNumber = -100;
+  const int kLastSeqNumber = 100;
+
+  for (int i = kFirstSeqNumber; i <= kLastSeqNumber; ++i) {
+    // Other parameters don't matter here.
+    linked_set_.Insert(static_cast<uint16_t>(i), 0, 0, 0);
+  }
+
+  // Packets arriving out of order should not affect the following values:
+  EXPECT_EQ(linked_set_.OldestSeqNumber(),
+            static_cast<uint16_t>(kFirstSeqNumber));
+  EXPECT_EQ(linked_set_.NewestSeqNumber(),
+            static_cast<uint16_t>(kLastSeqNumber));
+}
+
+class SequenceNumberOlderThanTest : public ::testing::Test {
+ public:
+  SequenceNumberOlderThanTest() {}
+  ~SequenceNumberOlderThanTest() {}
+
+ protected:
+  SequenceNumberOlderThan comparator_;
+};
+
+TEST_F(SequenceNumberOlderThanTest, Operator) {
+  // Operator()(x, y) returns true <==> y is newer than x.
+  EXPECT_TRUE(comparator_.operator()(0, 1));
+  EXPECT_TRUE(comparator_.operator()(1, 1000));
+  EXPECT_FALSE(comparator_.operator()(1, 0));
+  EXPECT_FALSE(comparator_.operator()(2, 2));
+  EXPECT_TRUE(comparator_.operator()(-10, 10));
+  EXPECT_FALSE(comparator_.operator()(10, -10));
+  EXPECT_TRUE(comparator_.operator()(0, 0x8000));
+  EXPECT_FALSE(comparator_.operator()(0x8000, 0));
+}
+
+class LossAccountTest : public ::testing::Test {
+ public:
+  LossAccountTest() {}
+  ~LossAccountTest() {}
+
+ protected:
+  LossAccount loss_account_;
+};
+
+TEST_F(LossAccountTest, Operations) {
+  const size_t kTotal = 100;  // Arbitrary values.
+  const size_t kLost = 10;
+
+  LossAccount rhs(kTotal, kLost);
+
+  loss_account_.Add(rhs);
+  EXPECT_EQ(loss_account_.num_total, kTotal);
+  EXPECT_EQ(loss_account_.num_lost, kLost);
+  EXPECT_NEAR(loss_account_.LossRatio(), static_cast<float>(kLost) / kTotal,
+              0.001f);
+
+  loss_account_.Subtract(rhs);
+  EXPECT_EQ(loss_account_.num_total, 0UL);
+  EXPECT_EQ(loss_account_.num_lost, 0UL);
+  EXPECT_NEAR(loss_account_.LossRatio(), 0.0f, 0.001f);
+}
+
+const int kFlowId = 1;  // Arbitrary.
+
+class BweReceiverTest : public ::testing::Test, public BweReceiver {

[stefan-webrtc, 2015/07/09 09:55:00]

I would prefer to make BweReceiver a member of this class instead.

[magalhaesc, 2015/07/09 11:20:07]

Right, some methods will become public then.

+ public:
+  BweReceiverTest() : BweReceiver(kFlowId) {}
+  ~BweReceiverTest() {}
+};
+
+TEST_F(BweReceiverTest, RecentKbps) {
+  EXPECT_EQ(RecentKbps(), 0U);
+
+  const size_t kPacketSizeBytes = 1200;
+  const int kNumPackets = 100;
+
+  double window_size_s = this->window_size_s();
+
+  // Receive packets at the same time.
+  for (int i = 0; i < kNumPackets; ++i) {
+    MediaPacket packet(kFlowId, 0, kPacketSizeBytes, i);
+    ReceivePacket(0, packet);
+  }
+
+  EXPECT_NEAR(
+      RecentKbps(),
+      (8 * kNumPackets * kPacketSizeBytes) / (1000 * window_size_s),
+      (8 * kNumPackets * kPacketSizeBytes) / (1000 * window_size_s * 20));
+
+  int64_t time_gap_ms =
+      2 * 1000 * window_size_s;  // Larger than rate_counter time window.
+
+  MediaPacket packet(kFlowId, time_gap_ms, kPacketSizeBytes, kNumPackets);
+  ReceivePacket(time_gap_ms, packet);
+
+  EXPECT_EQ(RecentKbps(),
+            (8 * kPacketSizeBytes) / (1000 * window_size_s));
+}
+
+TEST_F(BweReceiverTest, Loss) {
+
+  EXPECT_NEAR(GlobalReceiverPacketLossRatio(), 0.0f, 0.001f);
+
+  LossAccount loss_account = LinkedSetPacketLossRatio();
+  EXPECT_NEAR(loss_account.LossRatio(), 0.0f, 0.001f);
+
+  // Insert packets 1-50 and 151-200;
+  for (int i=1; i<=200; ++i){
+    // Packet size and timestamp do not matter here.
+    MediaPacket packet(kFlowId, 0, 0, i);
+    ReceivePacket(0, packet);
+    if (i==50){
+      i += 100;
+    }
+  }
+
+  loss_account = LinkedSetPacketLossRatio();
+  EXPECT_NEAR(loss_account.LossRatio(), 0.5f, 0.001f);
+
+  RelieveSetAndUpdateLoss();
+  EXPECT_EQ(received_packets_.size(), 100U/10);
+
+  // No packet loss within the preserved packets.
+  loss_account = LinkedSetPacketLossRatio();
+  EXPECT_NEAR(loss_account.LossRatio(), 0.0f, 0.001f);
+
+  // RelieveSetAndUpdateLoss automatically updates loss account.
+  EXPECT_NEAR(GlobalReceiverPacketLossRatio(), 0.5f, 0.001f);
+}
+
+}  // namespace bwe
+}  // namespace testing
+}  // namespace webrtc