quic/quartc/test/quartc_peer_test.cc - quiche.git - Git at Google

 // Copyright (c) 2019 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 "net/third_party/quiche/src/quic/quartc/test/quartc_peer.h"

 #include <utility>

 #include "net/third_party/quiche/src/quic/core/quic_bandwidth.h"
 #include "net/third_party/quiche/src/quic/core/quic_constants.h"
 #include "net/third_party/quiche/src/quic/core/quic_time.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_endpoint.h"
 #include "net/third_party/quiche/src/quic/quartc/simulated_packet_transport.h"
 #include "net/third_party/quiche/src/quic/test_tools/quic_test_utils.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/link.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/simulator.h"

 namespace quic {
 namespace test {
 namespace {

 class QuartcPeerTest : public QuicTest {
  protected:
   QuartcPeerTest()
       : client_transport_(&simulator_,
                           "client_transport",
                           "server_transport",
                           10 * kDefaultMaxPacketSize),
         server_transport_(&simulator_,
                           "server_transport",
                           "client_transport",
                           10 * kDefaultMaxPacketSize),
         client_server_link_(&client_transport_,
                             &server_transport_,
                             QuicBandwidth::FromKBitsPerSecond(512),
                             QuicTime::Delta::FromMilliseconds(100)) {
     SetQuicReloadableFlag(quic_default_to_bbr, true);
     simulator_.set_random_generator(&rng_);
   }

   void CreatePeers(const std::vector<QuartcDataSource::Config>& configs) {
     client_peer_ = std::make_unique<QuartcPeer>(
         simulator_.GetClock(), simulator_.GetAlarmFactory(),
         simulator_.GetRandomGenerator(),
         simulator_.GetStreamSendBufferAllocator(), configs);
     server_peer_ = std::make_unique<QuartcPeer>(
         simulator_.GetClock(), simulator_.GetAlarmFactory(),
         simulator_.GetRandomGenerator(),
         simulator_.GetStreamSendBufferAllocator(), configs);
   }

   void Connect() {
     DCHECK(client_peer_);
     DCHECK(server_peer_);

     server_endpoint_ = std::make_unique<QuartcServerEndpoint>(
         simulator_.GetAlarmFactory(), simulator_.GetClock(),
         simulator_.GetRandomGenerator(), server_peer_.get(),
         QuartcSessionConfig());
     client_endpoint_ = std::make_unique<QuartcClientEndpoint>(
         simulator_.GetAlarmFactory(), simulator_.GetClock(),
         simulator_.GetRandomGenerator(), client_peer_.get(),
         QuartcSessionConfig(), server_endpoint_->server_crypto_config());

     server_endpoint_->Connect(&server_transport_);
     client_endpoint_->Connect(&client_transport_);
   }

   void RampUpBandwidth() {
     // Run long enough for the bandwidth estimate to ramp up.
     simulator_.RunUntilOrTimeout(
         [this] {
           return client_peer_->last_available_bandwidth() ==
                      client_server_link_.bandwidth() &&
                  server_peer_->last_available_bandwidth() ==
                      client_server_link_.bandwidth();
         },
         QuicTime::Delta::FromSeconds(60));
   }

   SimpleRandom rng_;
   simulator::Simulator simulator_;
   simulator::SimulatedQuartcPacketTransport client_transport_;
   simulator::SimulatedQuartcPacketTransport server_transport_;
   simulator::SymmetricLink client_server_link_;

   std::unique_ptr<QuartcClientEndpoint> client_endpoint_;
   std::unique_ptr<QuartcPeer> client_peer_;

   std::unique_ptr<QuartcServerEndpoint> server_endpoint_;
   std::unique_ptr<QuartcPeer> server_peer_;
 };

 const ReceivedMessage& FindLastMessageFromSource(
     const std::vector<ReceivedMessage>& messages,
     int32_t source_id) {
   const auto& it = std::find_if(messages.rbegin(), messages.rend(),
                                 [source_id](const ReceivedMessage& r) {
                                   return r.frame.source_id == source_id;
                                 });
   return *it;
 }

 TEST_F(QuartcPeerTest, SendReceiveMessages) {
   QuicTime start_time = simulator_.GetClock()->Now();

   QuartcDataSource::Config config;
   config.id = 1;

   CreatePeers({config});
   Connect();

   ASSERT_TRUE(simulator_.RunUntil([this] {
     return !client_peer_->received_messages().empty() &&
            !server_peer_->received_messages().empty();
   }));

   QuicTime end_time = simulator_.GetClock()->Now();

   // Sanity checks on messages.
   const ReceivedMessage& client_message = client_peer_->received_messages()[0];
   EXPECT_EQ(client_message.frame.source_id, 1);
   EXPECT_EQ(client_message.frame.sequence_number, 0);
   EXPECT_GE(client_message.frame.send_time, start_time);
   EXPECT_LE(client_message.receive_time, end_time);

   const ReceivedMessage& server_message = server_peer_->received_messages()[0];
   EXPECT_EQ(server_message.frame.source_id, 1);
   EXPECT_EQ(server_message.frame.sequence_number, 0);
   EXPECT_GE(server_message.frame.send_time, start_time);
   EXPECT_LE(server_message.receive_time, end_time);
 }

 TEST_F(QuartcPeerTest, MaxFrameSizeUnset) {
   // Configure the source with no max frame size, and a framerate and max
   // bandwidth that allows very large frames (larger than will fit in a packet).
   QuartcDataSource::Config config;
   config.id = 1;
   config.frame_interval = QuicTime::Delta::FromMilliseconds(20);
   config.max_bandwidth = QuicBandwidth::FromBytesAndTimeDelta(
       2 * kDefaultMaxPacketSize, config.frame_interval);

   CreatePeers({config});
   Connect();
   RampUpBandwidth();

   // The peers generate frames that fit in one packet.
   EXPECT_LT(client_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
   EXPECT_LT(server_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
 }

 TEST_F(QuartcPeerTest, MaxFrameSizeLargerThanPacketSize) {
   // Configure the source with a max frame size larger than the packet size.
   QuartcDataSource::Config config;
   config.id = 1;
   config.max_frame_size = 2 * kDefaultMaxPacketSize;

   CreatePeers({config});
   Connect();
   RampUpBandwidth();

   // The peers generate frames that fit in one packet.
   EXPECT_LT(client_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
   EXPECT_LT(server_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
 }

 TEST_F(QuartcPeerTest, MaxFrameSizeSmallerThanPacketSize) {
   QuartcDataSource::Config config;
   config.id = 1;
   config.max_frame_size = 100;
   // Note that a long frame interval helps to ensure that the test produces
   // enough bytes per frame to reach max_frame_size.
   config.frame_interval = QuicTime::Delta::FromMilliseconds(100);

   CreatePeers({config});
   Connect();
   RampUpBandwidth();

   EXPECT_EQ(client_peer_->received_messages().back().frame.size, 100u);
   EXPECT_EQ(server_peer_->received_messages().back().frame.size, 100u);
 }

 TEST_F(QuartcPeerTest, MaxFrameSizeSmallerThanFrameHeader) {
   QuartcDataSource::Config config;
   config.id = 1;
   config.max_frame_size = kDataFrameHeaderSize - 1;

   CreatePeers({config});
   Connect();
   RampUpBandwidth();

   // Max frame sizes smaller than the header are ignored, and the frame size is
   // limited by packet size.
   EXPECT_LT(client_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
   EXPECT_LT(server_peer_->received_messages().back().frame.size,
             kDefaultMaxPacketSize);
 }

 TEST_F(QuartcPeerTest, SendReceiveMultipleSources) {
   QuicTime start_time = simulator_.GetClock()->Now();

   // Note: use of really long frame intervals means that each source should send
   // one frame during this test.  This simplifies expectations for received
   // data.
   QuartcDataSource::Config config_1;
   config_1.id = 1;
   config_1.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
   config_1.frame_interval = QuicTime::Delta::FromSeconds(10);

   QuartcDataSource::Config config_2;
   config_2.id = 2;
   config_2.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(64);
   config_2.frame_interval = QuicTime::Delta::FromSeconds(10);

   QuartcDataSource::Config config_3;
   config_3.id = 3;
   config_3.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(128);
   config_3.frame_interval = QuicTime::Delta::FromSeconds(10);

   CreatePeers({config_1, config_2, config_3});
   Connect();

   ASSERT_TRUE(simulator_.RunUntil([this] {
     return client_peer_->received_messages().size() == 3 &&
            server_peer_->received_messages().size() == 3;
   }));

   QuicTime end_time = simulator_.GetClock()->Now();

   // Sanity checks on messages.
   const auto& order = [](const ReceivedMessage& lhs,
                          const ReceivedMessage& rhs) {
     return lhs.frame.source_id < rhs.frame.source_id;
   };

   std::vector<ReceivedMessage> client_messages =
       client_peer_->received_messages();
   std::sort(client_messages.begin(), client_messages.end(), order);
   for (size_t i = 0; i < client_messages.size(); ++i) {
     EXPECT_EQ(client_messages[i].frame.source_id, static_cast<int32_t>(i + 1));
     EXPECT_EQ(client_messages[i].frame.sequence_number, 0);
     EXPECT_GE(client_messages[i].frame.send_time, start_time);
     EXPECT_LE(client_messages[i].receive_time, end_time);
   }

   std::vector<ReceivedMessage> server_messages =
       server_peer_->received_messages();
   std::sort(server_messages.begin(), server_messages.end(), order);
   for (size_t i = 0; i < server_messages.size(); ++i) {
     EXPECT_EQ(server_messages[i].frame.source_id, static_cast<int32_t>(i + 1u));
     EXPECT_EQ(server_messages[i].frame.sequence_number, 0);
     EXPECT_GE(server_messages[i].frame.send_time, start_time);
     EXPECT_LE(server_messages[i].receive_time, end_time);
   }
 }

 TEST_F(QuartcPeerTest, BandwidthAllocationWithEnoughAvailable) {
   QuartcDataSource::Config config_1;
   config_1.id = 1;
   config_1.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
   config_1.frame_interval = QuicTime::Delta::FromMilliseconds(100);

   QuartcDataSource::Config config_2;
   config_2.id = 2;
   config_2.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(64);
   config_2.frame_interval = QuicTime::Delta::FromMilliseconds(25);

   QuartcDataSource::Config config_3;
   config_3.id = 3;
   config_3.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(128);
   config_3.frame_interval = QuicTime::Delta::FromMilliseconds(10);

   CreatePeers({config_1, config_2, config_3});
   Connect();
   RampUpBandwidth();

   // The last message from each source should be the size allowed by that
   // source's maximum bandwidth and frame interval.
   QuicByteCount source_1_size =
       config_1.max_bandwidth.ToBytesPerPeriod(config_1.frame_interval);
   QuicByteCount source_2_size =
       config_2.max_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
   QuicByteCount source_3_size =
       config_3.max_bandwidth.ToBytesPerPeriod(config_3.frame_interval);

   const std::vector<ReceivedMessage>& client_messages =
       client_peer_->received_messages();
   EXPECT_EQ(FindLastMessageFromSource(client_messages, 1).frame.size,
             source_1_size);
   EXPECT_EQ(FindLastMessageFromSource(client_messages, 2).frame.size,
             source_2_size);
   EXPECT_EQ(FindLastMessageFromSource(client_messages, 3).frame.size,
             source_3_size);

   const std::vector<ReceivedMessage>& server_messages =
       server_peer_->received_messages();
   EXPECT_EQ(FindLastMessageFromSource(server_messages, 1).frame.size,
             source_1_size);
   EXPECT_EQ(FindLastMessageFromSource(server_messages, 2).frame.size,
             source_2_size);
   EXPECT_EQ(FindLastMessageFromSource(server_messages, 3).frame.size,
             source_3_size);
 }

 TEST_F(QuartcPeerTest, BandwidthAllocationWithoutEnoughAvailable) {
   QuartcDataSource::Config config_1;
   config_1.id = 1;
   config_1.max_bandwidth = client_server_link_.bandwidth() * 0.5;
   config_1.frame_interval = QuicTime::Delta::FromMilliseconds(10);

   QuartcDataSource::Config config_2;
   config_2.id = 2;
   config_2.min_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
   config_2.max_bandwidth = client_server_link_.bandwidth();
   config_2.frame_interval = QuicTime::Delta::FromMilliseconds(5);

   QuartcDataSource::Config config_3;
   config_3.id = 3;
   config_3.min_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
   config_3.max_bandwidth = client_server_link_.bandwidth() * 2;
   config_3.frame_interval = QuicTime::Delta::FromMilliseconds(20);

   CreatePeers({config_1, config_2, config_3});
   Connect();
   RampUpBandwidth();

   const std::vector<ReceivedMessage>& client_messages =
       client_peer_->received_messages();
   const std::vector<ReceivedMessage>& server_messages =
       server_peer_->received_messages();

   // Source 1 eventually ramps up to full bandwidth.
   const QuicByteCount source_1_size =
       config_1.max_bandwidth.ToBytesPerPeriod(config_1.frame_interval);
   EXPECT_EQ(FindLastMessageFromSource(client_messages, 1).frame.size,
             source_1_size);
   EXPECT_EQ(FindLastMessageFromSource(server_messages, 1).frame.size,
             source_1_size);

   // Source 2 takes the remainder of available bandwidth.  However, the exact
   // value depends on the bandwidth estimate.
   const QuicByteCount source_2_min =
       config_2.min_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
   const QuicByteCount source_2_max =
       config_2.max_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
   EXPECT_GT(FindLastMessageFromSource(client_messages, 2).frame.size,
             source_2_min);
   EXPECT_LT(FindLastMessageFromSource(client_messages, 2).frame.size,
             source_2_max);
   EXPECT_GT(FindLastMessageFromSource(server_messages, 2).frame.size,
             source_2_min);
   EXPECT_LT(FindLastMessageFromSource(server_messages, 2).frame.size,
             source_2_max);

   // Source 3 gets only its minimum bandwidth.
   const QuicByteCount source_3_size =
       config_3.min_bandwidth.ToBytesPerPeriod(config_3.frame_interval);
   EXPECT_EQ(FindLastMessageFromSource(client_messages, 3).frame.size,
             source_3_size);
   EXPECT_EQ(FindLastMessageFromSource(server_messages, 3).frame.size,
             source_3_size);
 }

 TEST_F(QuartcPeerTest, DisableAndDrainMessages) {
   QuartcDataSource::Config config;
   config.id = 1;
   config.max_bandwidth = client_server_link_.bandwidth() * 0.5;
   config.frame_interval = QuicTime::Delta::FromMilliseconds(10);

   CreatePeers({config});
   Connect();

   // Note: this time is completely arbitrary, to allow messages to be sent.
   simulator_.RunFor(QuicTime::Delta::FromSeconds(10));

   // After these calls, we should observe no new messages.
   server_peer_->SetEnabled(false);
   client_peer_->SetEnabled(false);

   std::map<int32_t, int64_t> last_sent_by_client =
       client_peer_->GetLastSequenceNumbers();
   std::map<int32_t, int64_t> last_sent_by_server =
       server_peer_->GetLastSequenceNumbers();

   // Note: this time is completely arbitrary, to allow time for the peers to
   // generate new messages after being disabled.  The point of the test is that
   // they should not do that.
   simulator_.RunFor(QuicTime::Delta::FromSeconds(10));

   // Messages sent prior to disabling the peers are eventually received.
   EXPECT_TRUE(simulator_.RunUntilOrTimeout(
       [this, last_sent_by_client, last_sent_by_server]() mutable -> bool {
         return !client_peer_->received_messages().empty() &&
                client_peer_->received_messages().back().frame.sequence_number ==
                    last_sent_by_server[1] &&
                !server_peer_->received_messages().empty() &&
                server_peer_->received_messages().back().frame.sequence_number ==
                    last_sent_by_client[1];
       },
       QuicTime::Delta::FromSeconds(60)));
 }

 }  // namespace
 }  // namespace test
 }  // namespace quic
	// Copyright (c) 2019 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 "net/third_party/quiche/src/quic/quartc/test/quartc_peer.h"

	#include <utility>

	#include "net/third_party/quiche/src/quic/core/quic_bandwidth.h"
	#include "net/third_party/quiche/src/quic/core/quic_constants.h"
	#include "net/third_party/quiche/src/quic/core/quic_time.h"
	#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
	#include "net/third_party/quiche/src/quic/quartc/quartc_endpoint.h"
	#include "net/third_party/quiche/src/quic/quartc/simulated_packet_transport.h"
	#include "net/third_party/quiche/src/quic/test_tools/quic_test_utils.h"
	#include "net/third_party/quiche/src/quic/test_tools/simulator/link.h"
	#include "net/third_party/quiche/src/quic/test_tools/simulator/simulator.h"

	namespace quic {
	namespace test {
	namespace {

	class QuartcPeerTest : public QuicTest {
	protected:
	QuartcPeerTest()
	: client_transport_(&simulator_,
	"client_transport",
	"server_transport",
	10 * kDefaultMaxPacketSize),
	server_transport_(&simulator_,
	"server_transport",
	"client_transport",
	10 * kDefaultMaxPacketSize),
	client_server_link_(&client_transport_,
	&server_transport_,
	QuicBandwidth::FromKBitsPerSecond(512),
	QuicTime::Delta::FromMilliseconds(100)) {
	SetQuicReloadableFlag(quic_default_to_bbr, true);
	simulator_.set_random_generator(&rng_);
	}

	void CreatePeers(const std::vector<QuartcDataSource::Config>& configs) {
	client_peer_ = std::make_unique<QuartcPeer>(
	simulator_.GetClock(), simulator_.GetAlarmFactory(),
	simulator_.GetRandomGenerator(),
	simulator_.GetStreamSendBufferAllocator(), configs);
	server_peer_ = std::make_unique<QuartcPeer>(
	simulator_.GetClock(), simulator_.GetAlarmFactory(),
	simulator_.GetRandomGenerator(),
	simulator_.GetStreamSendBufferAllocator(), configs);
	}

	void Connect() {
	DCHECK(client_peer_);
	DCHECK(server_peer_);

	server_endpoint_ = std::make_unique<QuartcServerEndpoint>(
	simulator_.GetAlarmFactory(), simulator_.GetClock(),
	simulator_.GetRandomGenerator(), server_peer_.get(),
	QuartcSessionConfig());
	client_endpoint_ = std::make_unique<QuartcClientEndpoint>(
	simulator_.GetAlarmFactory(), simulator_.GetClock(),
	simulator_.GetRandomGenerator(), client_peer_.get(),
	QuartcSessionConfig(), server_endpoint_->server_crypto_config());

	server_endpoint_->Connect(&server_transport_);
	client_endpoint_->Connect(&client_transport_);
	}

	void RampUpBandwidth() {
	// Run long enough for the bandwidth estimate to ramp up.
	simulator_.RunUntilOrTimeout(
	[this] {
	return client_peer_->last_available_bandwidth() ==
	client_server_link_.bandwidth() &&
	server_peer_->last_available_bandwidth() ==
	client_server_link_.bandwidth();
	},
	QuicTime::Delta::FromSeconds(60));
	}

	SimpleRandom rng_;
	simulator::Simulator simulator_;
	simulator::SimulatedQuartcPacketTransport client_transport_;
	simulator::SimulatedQuartcPacketTransport server_transport_;
	simulator::SymmetricLink client_server_link_;

	std::unique_ptr<QuartcClientEndpoint> client_endpoint_;
	std::unique_ptr<QuartcPeer> client_peer_;

	std::unique_ptr<QuartcServerEndpoint> server_endpoint_;
	std::unique_ptr<QuartcPeer> server_peer_;
	};

	const ReceivedMessage& FindLastMessageFromSource(
	const std::vector<ReceivedMessage>& messages,
	int32_t source_id) {
	const auto& it = std::find_if(messages.rbegin(), messages.rend(),
	[source_id](const ReceivedMessage& r) {
	return r.frame.source_id == source_id;
	});
	return *it;
	}

	TEST_F(QuartcPeerTest, SendReceiveMessages) {
	QuicTime start_time = simulator_.GetClock()->Now();

	QuartcDataSource::Config config;
	config.id = 1;

	CreatePeers({config});
	Connect();

	ASSERT_TRUE(simulator_.RunUntil([this] {
	return !client_peer_->received_messages().empty() &&
	!server_peer_->received_messages().empty();
	}));

	QuicTime end_time = simulator_.GetClock()->Now();

	// Sanity checks on messages.
	const ReceivedMessage& client_message = client_peer_->received_messages()[0];
	EXPECT_EQ(client_message.frame.source_id, 1);
	EXPECT_EQ(client_message.frame.sequence_number, 0);
	EXPECT_GE(client_message.frame.send_time, start_time);
	EXPECT_LE(client_message.receive_time, end_time);

	const ReceivedMessage& server_message = server_peer_->received_messages()[0];
	EXPECT_EQ(server_message.frame.source_id, 1);
	EXPECT_EQ(server_message.frame.sequence_number, 0);
	EXPECT_GE(server_message.frame.send_time, start_time);
	EXPECT_LE(server_message.receive_time, end_time);
	}

	TEST_F(QuartcPeerTest, MaxFrameSizeUnset) {
	// Configure the source with no max frame size, and a framerate and max
	// bandwidth that allows very large frames (larger than will fit in a packet).
	QuartcDataSource::Config config;
	config.id = 1;
	config.frame_interval = QuicTime::Delta::FromMilliseconds(20);
	config.max_bandwidth = QuicBandwidth::FromBytesAndTimeDelta(
	2 * kDefaultMaxPacketSize, config.frame_interval);

	CreatePeers({config});
	Connect();
	RampUpBandwidth();

	// The peers generate frames that fit in one packet.
	EXPECT_LT(client_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	EXPECT_LT(server_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	}

	TEST_F(QuartcPeerTest, MaxFrameSizeLargerThanPacketSize) {
	// Configure the source with a max frame size larger than the packet size.
	QuartcDataSource::Config config;
	config.id = 1;
	config.max_frame_size = 2 * kDefaultMaxPacketSize;

	CreatePeers({config});
	Connect();
	RampUpBandwidth();

	// The peers generate frames that fit in one packet.
	EXPECT_LT(client_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	EXPECT_LT(server_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	}

	TEST_F(QuartcPeerTest, MaxFrameSizeSmallerThanPacketSize) {
	QuartcDataSource::Config config;
	config.id = 1;
	config.max_frame_size = 100;
	// Note that a long frame interval helps to ensure that the test produces
	// enough bytes per frame to reach max_frame_size.
	config.frame_interval = QuicTime::Delta::FromMilliseconds(100);

	CreatePeers({config});
	Connect();
	RampUpBandwidth();

	EXPECT_EQ(client_peer_->received_messages().back().frame.size, 100u);
	EXPECT_EQ(server_peer_->received_messages().back().frame.size, 100u);
	}

	TEST_F(QuartcPeerTest, MaxFrameSizeSmallerThanFrameHeader) {
	QuartcDataSource::Config config;
	config.id = 1;
	config.max_frame_size = kDataFrameHeaderSize - 1;

	CreatePeers({config});
	Connect();
	RampUpBandwidth();

	// Max frame sizes smaller than the header are ignored, and the frame size is
	// limited by packet size.
	EXPECT_LT(client_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	EXPECT_LT(server_peer_->received_messages().back().frame.size,
	kDefaultMaxPacketSize);
	}

	TEST_F(QuartcPeerTest, SendReceiveMultipleSources) {
	QuicTime start_time = simulator_.GetClock()->Now();

	// Note: use of really long frame intervals means that each source should send
	// one frame during this test. This simplifies expectations for received
	// data.
	QuartcDataSource::Config config_1;
	config_1.id = 1;
	config_1.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
	config_1.frame_interval = QuicTime::Delta::FromSeconds(10);

	QuartcDataSource::Config config_2;
	config_2.id = 2;
	config_2.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(64);
	config_2.frame_interval = QuicTime::Delta::FromSeconds(10);

	QuartcDataSource::Config config_3;
	config_3.id = 3;
	config_3.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(128);
	config_3.frame_interval = QuicTime::Delta::FromSeconds(10);

	CreatePeers({config_1, config_2, config_3});
	Connect();

	ASSERT_TRUE(simulator_.RunUntil([this] {
	return client_peer_->received_messages().size() == 3 &&
	server_peer_->received_messages().size() == 3;
	}));

	QuicTime end_time = simulator_.GetClock()->Now();

	// Sanity checks on messages.
	const auto& order = [](const ReceivedMessage& lhs,
	const ReceivedMessage& rhs) {
	return lhs.frame.source_id < rhs.frame.source_id;
	};

	std::vector<ReceivedMessage> client_messages =
	client_peer_->received_messages();
	std::sort(client_messages.begin(), client_messages.end(), order);
	for (size_t i = 0; i < client_messages.size(); ++i) {
	EXPECT_EQ(client_messages[i].frame.source_id, static_cast<int32_t>(i + 1));
	EXPECT_EQ(client_messages[i].frame.sequence_number, 0);
	EXPECT_GE(client_messages[i].frame.send_time, start_time);
	EXPECT_LE(client_messages[i].receive_time, end_time);
	}

	std::vector<ReceivedMessage> server_messages =
	server_peer_->received_messages();
	std::sort(server_messages.begin(), server_messages.end(), order);
	for (size_t i = 0; i < server_messages.size(); ++i) {
	EXPECT_EQ(server_messages[i].frame.source_id, static_cast<int32_t>(i + 1u));
	EXPECT_EQ(server_messages[i].frame.sequence_number, 0);
	EXPECT_GE(server_messages[i].frame.send_time, start_time);
	EXPECT_LE(server_messages[i].receive_time, end_time);
	}
	}

	TEST_F(QuartcPeerTest, BandwidthAllocationWithEnoughAvailable) {
	QuartcDataSource::Config config_1;
	config_1.id = 1;
	config_1.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
	config_1.frame_interval = QuicTime::Delta::FromMilliseconds(100);

	QuartcDataSource::Config config_2;
	config_2.id = 2;
	config_2.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(64);
	config_2.frame_interval = QuicTime::Delta::FromMilliseconds(25);

	QuartcDataSource::Config config_3;
	config_3.id = 3;
	config_3.max_bandwidth = QuicBandwidth::FromKBitsPerSecond(128);
	config_3.frame_interval = QuicTime::Delta::FromMilliseconds(10);

	CreatePeers({config_1, config_2, config_3});
	Connect();
	RampUpBandwidth();

	// The last message from each source should be the size allowed by that
	// source's maximum bandwidth and frame interval.
	QuicByteCount source_1_size =
	config_1.max_bandwidth.ToBytesPerPeriod(config_1.frame_interval);
	QuicByteCount source_2_size =
	config_2.max_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
	QuicByteCount source_3_size =
	config_3.max_bandwidth.ToBytesPerPeriod(config_3.frame_interval);

	const std::vector<ReceivedMessage>& client_messages =
	client_peer_->received_messages();
	EXPECT_EQ(FindLastMessageFromSource(client_messages, 1).frame.size,
	source_1_size);
	EXPECT_EQ(FindLastMessageFromSource(client_messages, 2).frame.size,
	source_2_size);
	EXPECT_EQ(FindLastMessageFromSource(client_messages, 3).frame.size,
	source_3_size);

	const std::vector<ReceivedMessage>& server_messages =
	server_peer_->received_messages();
	EXPECT_EQ(FindLastMessageFromSource(server_messages, 1).frame.size,
	source_1_size);
	EXPECT_EQ(FindLastMessageFromSource(server_messages, 2).frame.size,
	source_2_size);
	EXPECT_EQ(FindLastMessageFromSource(server_messages, 3).frame.size,
	source_3_size);
	}

	TEST_F(QuartcPeerTest, BandwidthAllocationWithoutEnoughAvailable) {
	QuartcDataSource::Config config_1;
	config_1.id = 1;
	config_1.max_bandwidth = client_server_link_.bandwidth() * 0.5;
	config_1.frame_interval = QuicTime::Delta::FromMilliseconds(10);

	QuartcDataSource::Config config_2;
	config_2.id = 2;
	config_2.min_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
	config_2.max_bandwidth = client_server_link_.bandwidth();
	config_2.frame_interval = QuicTime::Delta::FromMilliseconds(5);

	QuartcDataSource::Config config_3;
	config_3.id = 3;
	config_3.min_bandwidth = QuicBandwidth::FromKBitsPerSecond(32);
	config_3.max_bandwidth = client_server_link_.bandwidth() * 2;
	config_3.frame_interval = QuicTime::Delta::FromMilliseconds(20);

	CreatePeers({config_1, config_2, config_3});
	Connect();
	RampUpBandwidth();

	const std::vector<ReceivedMessage>& client_messages =
	client_peer_->received_messages();
	const std::vector<ReceivedMessage>& server_messages =
	server_peer_->received_messages();

	// Source 1 eventually ramps up to full bandwidth.
	const QuicByteCount source_1_size =
	config_1.max_bandwidth.ToBytesPerPeriod(config_1.frame_interval);
	EXPECT_EQ(FindLastMessageFromSource(client_messages, 1).frame.size,
	source_1_size);
	EXPECT_EQ(FindLastMessageFromSource(server_messages, 1).frame.size,
	source_1_size);

	// Source 2 takes the remainder of available bandwidth. However, the exact
	// value depends on the bandwidth estimate.
	const QuicByteCount source_2_min =
	config_2.min_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
	const QuicByteCount source_2_max =
	config_2.max_bandwidth.ToBytesPerPeriod(config_2.frame_interval);
	EXPECT_GT(FindLastMessageFromSource(client_messages, 2).frame.size,
	source_2_min);
	EXPECT_LT(FindLastMessageFromSource(client_messages, 2).frame.size,
	source_2_max);
	EXPECT_GT(FindLastMessageFromSource(server_messages, 2).frame.size,
	source_2_min);
	EXPECT_LT(FindLastMessageFromSource(server_messages, 2).frame.size,
	source_2_max);

	// Source 3 gets only its minimum bandwidth.
	const QuicByteCount source_3_size =
	config_3.min_bandwidth.ToBytesPerPeriod(config_3.frame_interval);
	EXPECT_EQ(FindLastMessageFromSource(client_messages, 3).frame.size,
	source_3_size);
	EXPECT_EQ(FindLastMessageFromSource(server_messages, 3).frame.size,
	source_3_size);
	}

	TEST_F(QuartcPeerTest, DisableAndDrainMessages) {
	QuartcDataSource::Config config;
	config.id = 1;
	config.max_bandwidth = client_server_link_.bandwidth() * 0.5;
	config.frame_interval = QuicTime::Delta::FromMilliseconds(10);

	CreatePeers({config});
	Connect();

	// Note: this time is completely arbitrary, to allow messages to be sent.
	simulator_.RunFor(QuicTime::Delta::FromSeconds(10));

	// After these calls, we should observe no new messages.
	server_peer_->SetEnabled(false);
	client_peer_->SetEnabled(false);

	std::map<int32_t, int64_t> last_sent_by_client =
	client_peer_->GetLastSequenceNumbers();
	std::map<int32_t, int64_t> last_sent_by_server =
	server_peer_->GetLastSequenceNumbers();

	// Note: this time is completely arbitrary, to allow time for the peers to
	// generate new messages after being disabled. The point of the test is that
	// they should not do that.
	simulator_.RunFor(QuicTime::Delta::FromSeconds(10));

	// Messages sent prior to disabling the peers are eventually received.
	EXPECT_TRUE(simulator_.RunUntilOrTimeout(
	[this, last_sent_by_client, last_sent_by_server]() mutable -> bool {
	return !client_peer_->received_messages().empty() &&
	client_peer_->received_messages().back().frame.sequence_number ==
	last_sent_by_server[1] &&
	!server_peer_->received_messages().empty() &&
	server_peer_->received_messages().back().frame.sequence_number ==
	last_sent_by_client[1];
	},
	QuicTime::Delta::FromSeconds(60)));
	}

	} // namespace
	} // namespace test
	} // namespace quic