src/net/quic/quic_packet_generator_test.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/quic/quic_packet_generator.h"
   6
   7 #include <string>
   8
   9 #include "net/quic/crypto/crypto_protocol.h"
  10 #include "net/quic/crypto/null_encrypter.h"
  11 #include "net/quic/crypto/quic_decrypter.h"
  12 #include "net/quic/crypto/quic_encrypter.h"
  13 #include "net/quic/quic_utils.h"
  14 #include "net/quic/test_tools/quic_packet_creator_peer.h"
  15 #include "net/quic/test_tools/quic_packet_generator_peer.h"
  16 #include "net/quic/test_tools/quic_test_utils.h"
  17 #include "net/quic/test_tools/simple_quic_framer.h"
  18 #include "testing/gmock/include/gmock/gmock.h"
  19 #include "testing/gtest/include/gtest/gtest.h"
  20
  21 using base::StringPiece;
  22 using std::string;
  23 using testing::InSequence;
  24 using testing::Return;
  25 using testing::SaveArg;
  26 using testing::StrictMock;
  27 using testing::_;
  28
  29 namespace net {
  30 namespace test {
  31 namespace {
  32
  33 class MockDelegate : public QuicPacketGenerator::DelegateInterface {
  34  public:
  35   MockDelegate() {}
  36   virtual ~MockDelegate() OVERRIDE {}
  37
  38   MOCK_METHOD3(ShouldGeneratePacket,
  39                bool(TransmissionType transmission_type,
  40                     HasRetransmittableData retransmittable,
  41                     IsHandshake handshake));
  42   MOCK_METHOD0(CreateAckFrame, QuicAckFrame*());
  43   MOCK_METHOD0(CreateFeedbackFrame, QuicCongestionFeedbackFrame*());
  44   MOCK_METHOD0(CreateStopWaitingFrame, QuicStopWaitingFrame*());
  45   MOCK_METHOD1(OnSerializedPacket, bool(const SerializedPacket& packet));
  46   MOCK_METHOD2(CloseConnection, void(QuicErrorCode, bool));
  47
  48   void SetCanWriteAnything() {
  49     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION, _, _))
  50         .WillRepeatedly(Return(true));
  51     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION,
  52                                             NO_RETRANSMITTABLE_DATA, _))
  53         .WillRepeatedly(Return(true));
  54   }
  55
  56   void SetCanNotWrite() {
  57     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION, _, _))
  58         .WillRepeatedly(Return(false));
  59     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION,
  60                                             NO_RETRANSMITTABLE_DATA, _))
  61         .WillRepeatedly(Return(false));
  62   }
  63
  64   // Use this when only ack and feedback frames should be allowed to be written.
  65   void SetCanWriteOnlyNonRetransmittable() {
  66     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION, _, _))
  67         .WillRepeatedly(Return(false));
  68     EXPECT_CALL(*this, ShouldGeneratePacket(NOT_RETRANSMISSION,
  69                                             NO_RETRANSMITTABLE_DATA, _))
  70         .WillRepeatedly(Return(true));
  71   }
  72
  73  private:
  74   DISALLOW_COPY_AND_ASSIGN(MockDelegate);
  75 };
  76
  77 // Simple struct for describing the contents of a packet.
  78 // Useful in conjunction with a SimpleQuicFrame for validating
  79 // that a packet contains the expected frames.
  80 struct PacketContents {
  81   PacketContents()
  82       : num_ack_frames(0),
  83         num_connection_close_frames(0),
  84         num_feedback_frames(0),
  85         num_goaway_frames(0),
  86         num_rst_stream_frames(0),
  87         num_stop_waiting_frames(0),
  88         num_stream_frames(0),
  89         fec_group(0) {
  90   }
  91
  92   size_t num_ack_frames;
  93   size_t num_connection_close_frames;
  94   size_t num_feedback_frames;
  95   size_t num_goaway_frames;
  96   size_t num_rst_stream_frames;
  97   size_t num_stop_waiting_frames;
  98   size_t num_stream_frames;
  99
 100   QuicFecGroupNumber fec_group;
 101 };
 102
 103 }  // namespace
 104
 105 class QuicPacketGeneratorTest : public ::testing::Test {
 106  protected:
 107   QuicPacketGeneratorTest()
 108       : framer_(QuicSupportedVersions(), QuicTime::Zero(), false),
 109         generator_(42, &framer_, &random_, &delegate_),
 110         creator_(QuicPacketGeneratorPeer::GetPacketCreator(&generator_)),
 111         packet_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 112         packet2_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 113         packet3_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 114         packet4_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 115         packet5_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 116         packet6_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL),
 117         packet7_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL) {
 118   }
 119
 120   virtual ~QuicPacketGeneratorTest() OVERRIDE {
 121     delete packet_.packet;
 122     delete packet_.retransmittable_frames;
 123     delete packet2_.packet;
 124     delete packet2_.retransmittable_frames;
 125     delete packet3_.packet;
 126     delete packet3_.retransmittable_frames;
 127     delete packet4_.packet;
 128     delete packet4_.retransmittable_frames;
 129     delete packet5_.packet;
 130     delete packet5_.retransmittable_frames;
 131     delete packet6_.packet;
 132     delete packet6_.retransmittable_frames;
 133     delete packet7_.packet;
 134     delete packet7_.retransmittable_frames;
 135   }
 136
 137   QuicAckFrame* CreateAckFrame() {
 138     // TODO(rch): Initialize this so it can be verified later.
 139     return new QuicAckFrame(MakeAckFrame(0));
 140   }
 141
 142   QuicCongestionFeedbackFrame* CreateFeedbackFrame() {
 143     QuicCongestionFeedbackFrame* frame = new QuicCongestionFeedbackFrame;
 144     frame->type = kTCP;
 145     frame->tcp.receive_window = 0x4030;
 146     return frame;
 147   }
 148
 149   QuicStopWaitingFrame* CreateStopWaitingFrame() {
 150     QuicStopWaitingFrame* frame = new QuicStopWaitingFrame();
 151     frame->entropy_hash = 0;
 152     frame->least_unacked = 0;
 153     return frame;
 154   }
 155
 156   QuicRstStreamFrame* CreateRstStreamFrame() {
 157     return new QuicRstStreamFrame(1, QUIC_STREAM_NO_ERROR, 0);
 158   }
 159
 160   QuicGoAwayFrame* CreateGoAwayFrame() {
 161     return new QuicGoAwayFrame(QUIC_NO_ERROR, 1, string());
 162   }
 163
 164   void CheckPacketContains(const PacketContents& contents,
 165                            const SerializedPacket& packet) {
 166     size_t num_retransmittable_frames = contents.num_connection_close_frames +
 167         contents.num_goaway_frames + contents.num_rst_stream_frames +
 168         contents.num_stream_frames;
 169     size_t num_frames = contents.num_feedback_frames + contents.num_ack_frames +
 170         contents.num_stop_waiting_frames + num_retransmittable_frames;
 171
 172     if (num_retransmittable_frames == 0) {
 173       ASSERT_TRUE(packet.retransmittable_frames == NULL);
 174     } else {
 175       ASSERT_TRUE(packet.retransmittable_frames != NULL);
 176       EXPECT_EQ(num_retransmittable_frames,
 177                 packet.retransmittable_frames->frames().size());
 178     }
 179
 180     ASSERT_TRUE(packet.packet != NULL);
 181     ASSERT_TRUE(simple_framer_.ProcessPacket(*packet.packet));
 182     EXPECT_EQ(num_frames, simple_framer_.num_frames());
 183     EXPECT_EQ(contents.num_ack_frames, simple_framer_.ack_frames().size());
 184     EXPECT_EQ(contents.num_connection_close_frames,
 185               simple_framer_.connection_close_frames().size());
 186     EXPECT_EQ(contents.num_feedback_frames,
 187               simple_framer_.feedback_frames().size());
 188     EXPECT_EQ(contents.num_goaway_frames,
 189               simple_framer_.goaway_frames().size());
 190     EXPECT_EQ(contents.num_rst_stream_frames,
 191               simple_framer_.rst_stream_frames().size());
 192     EXPECT_EQ(contents.num_stream_frames,
 193               simple_framer_.stream_frames().size());
 194     EXPECT_EQ(contents.num_stop_waiting_frames,
 195               simple_framer_.stop_waiting_frames().size());
 196     EXPECT_EQ(contents.fec_group, simple_framer_.header().fec_group);
 197   }
 198
 199   void CheckPacketHasSingleStreamFrame(const SerializedPacket& packet) {
 200     ASSERT_TRUE(packet.retransmittable_frames != NULL);
 201     EXPECT_EQ(1u, packet.retransmittable_frames->frames().size());
 202     ASSERT_TRUE(packet.packet != NULL);
 203     ASSERT_TRUE(simple_framer_.ProcessPacket(*packet.packet));
 204     EXPECT_EQ(1u, simple_framer_.num_frames());
 205     EXPECT_EQ(1u, simple_framer_.stream_frames().size());
 206   }
 207
 208   void CheckPacketIsFec(const SerializedPacket& packet,
 209                         QuicPacketSequenceNumber fec_group) {
 210     ASSERT_TRUE(packet.retransmittable_frames == NULL);
 211     ASSERT_TRUE(packet.packet != NULL);
 212     ASSERT_TRUE(simple_framer_.ProcessPacket(*packet.packet));
 213     EXPECT_TRUE(simple_framer_.header().fec_flag);
 214     EXPECT_EQ(fec_group, simple_framer_.fec_data().fec_group);
 215   }
 216
 217   IOVector CreateData(size_t len) {
 218     data_array_.reset(new char[len]);
 219     memset(data_array_.get(), '?', len);
 220     IOVector data;
 221     data.Append(data_array_.get(), len);
 222     return data;
 223   }
 224
 225   QuicFramer framer_;
 226   MockRandom random_;
 227   StrictMock<MockDelegate> delegate_;
 228   QuicPacketGenerator generator_;
 229   QuicPacketCreator* creator_;
 230   SimpleQuicFramer simple_framer_;
 231   SerializedPacket packet_;
 232   SerializedPacket packet2_;
 233   SerializedPacket packet3_;
 234   SerializedPacket packet4_;
 235   SerializedPacket packet5_;
 236   SerializedPacket packet6_;
 237   SerializedPacket packet7_;
 238
 239  private:
 240   scoped_ptr<char[]> data_array_;
 241 };
 242
 243 class MockDebugDelegate : public QuicPacketGenerator::DebugDelegate {
 244  public:
 245   MOCK_METHOD1(OnFrameAddedToPacket,
 246                void(const QuicFrame&));
 247 };
 248
 249 TEST_F(QuicPacketGeneratorTest, ShouldSendAck_NotWritable) {
 250   delegate_.SetCanNotWrite();
 251
 252   generator_.SetShouldSendAck(false, false);
 253   EXPECT_TRUE(generator_.HasQueuedFrames());
 254 }
 255
 256 TEST_F(QuicPacketGeneratorTest, ShouldSendAck_WritableAndShouldNotFlush) {
 257   StrictMock<MockDebugDelegate> debug_delegate;
 258
 259   generator_.set_debug_delegate(&debug_delegate);
 260   delegate_.SetCanWriteOnlyNonRetransmittable();
 261   generator_.StartBatchOperations();
 262
 263   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 264   EXPECT_CALL(debug_delegate, OnFrameAddedToPacket(_)).Times(1);
 265
 266   generator_.SetShouldSendAck(false, false);
 267   EXPECT_TRUE(generator_.HasQueuedFrames());
 268 }
 269
 270 TEST_F(QuicPacketGeneratorTest, ShouldSendAck_WritableAndShouldFlush) {
 271   delegate_.SetCanWriteOnlyNonRetransmittable();
 272
 273   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 274   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 275       DoAll(SaveArg<0>(&packet_), Return(true)));
 276
 277   generator_.SetShouldSendAck(false, false);
 278   EXPECT_FALSE(generator_.HasQueuedFrames());
 279
 280   PacketContents contents;
 281   contents.num_ack_frames = 1;
 282   CheckPacketContains(contents, packet_);
 283 }
 284
 285 TEST_F(QuicPacketGeneratorTest,
 286        ShouldSendAckWithFeedback_WritableAndShouldNotFlush) {
 287   delegate_.SetCanWriteOnlyNonRetransmittable();
 288   generator_.StartBatchOperations();
 289
 290   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 291   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
 292       Return(CreateFeedbackFrame()));
 293
 294   generator_.SetShouldSendAck(true, false);
 295   EXPECT_TRUE(generator_.HasQueuedFrames());
 296 }
 297
 298 TEST_F(QuicPacketGeneratorTest,
 299        ShouldSendAckWithFeedback_WritableAndShouldFlush) {
 300   delegate_.SetCanWriteOnlyNonRetransmittable();
 301
 302   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 303   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
 304       Return(CreateFeedbackFrame()));
 305   EXPECT_CALL(delegate_, CreateStopWaitingFrame()).WillOnce(
 306       Return(CreateStopWaitingFrame()));
 307
 308   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 309       DoAll(SaveArg<0>(&packet_), Return(true)));
 310
 311   generator_.SetShouldSendAck(true, true);
 312   EXPECT_FALSE(generator_.HasQueuedFrames());
 313
 314   PacketContents contents;
 315   contents.num_ack_frames = 1;
 316   contents.num_feedback_frames = 1;
 317   contents.num_stop_waiting_frames = 1;
 318   CheckPacketContains(contents, packet_);
 319 }
 320
 321 TEST_F(QuicPacketGeneratorTest, AddControlFrame_NotWritable) {
 322   delegate_.SetCanNotWrite();
 323
 324   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 325   EXPECT_TRUE(generator_.HasQueuedFrames());
 326 }
 327
 328 TEST_F(QuicPacketGeneratorTest, AddControlFrame_OnlyAckWritable) {
 329   delegate_.SetCanWriteOnlyNonRetransmittable();
 330
 331   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 332   EXPECT_TRUE(generator_.HasQueuedFrames());
 333 }
 334
 335 TEST_F(QuicPacketGeneratorTest, AddControlFrame_WritableAndShouldNotFlush) {
 336   delegate_.SetCanWriteAnything();
 337   generator_.StartBatchOperations();
 338
 339   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 340   EXPECT_TRUE(generator_.HasQueuedFrames());
 341 }
 342
 343 TEST_F(QuicPacketGeneratorTest, AddControlFrame_NotWritableBatchThenFlush) {
 344   delegate_.SetCanNotWrite();
 345   generator_.StartBatchOperations();
 346
 347   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 348   EXPECT_TRUE(generator_.HasQueuedFrames());
 349   generator_.FinishBatchOperations();
 350   EXPECT_TRUE(generator_.HasQueuedFrames());
 351
 352   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 353       DoAll(SaveArg<0>(&packet_), Return(true)));
 354   generator_.FlushAllQueuedFrames();
 355   EXPECT_FALSE(generator_.HasQueuedFrames());
 356
 357   PacketContents contents;
 358   contents.num_rst_stream_frames = 1;
 359   CheckPacketContains(contents, packet_);
 360 }
 361
 362 TEST_F(QuicPacketGeneratorTest, AddControlFrame_WritableAndShouldFlush) {
 363   delegate_.SetCanWriteAnything();
 364
 365   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 366       DoAll(SaveArg<0>(&packet_), Return(true)));
 367
 368   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 369   EXPECT_FALSE(generator_.HasQueuedFrames());
 370
 371   PacketContents contents;
 372   contents.num_rst_stream_frames = 1;
 373   CheckPacketContains(contents, packet_);
 374 }
 375
 376 TEST_F(QuicPacketGeneratorTest, ConsumeData_NotWritable) {
 377   delegate_.SetCanNotWrite();
 378
 379   QuicConsumedData consumed = generator_.ConsumeData(
 380       kHeadersStreamId, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
 381   EXPECT_EQ(0u, consumed.bytes_consumed);
 382   EXPECT_FALSE(consumed.fin_consumed);
 383   EXPECT_FALSE(generator_.HasQueuedFrames());
 384 }
 385
 386 TEST_F(QuicPacketGeneratorTest, ConsumeData_WritableAndShouldNotFlush) {
 387   delegate_.SetCanWriteAnything();
 388   generator_.StartBatchOperations();
 389
 390   QuicConsumedData consumed = generator_.ConsumeData(
 391       kHeadersStreamId, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
 392   EXPECT_EQ(3u, consumed.bytes_consumed);
 393   EXPECT_TRUE(consumed.fin_consumed);
 394   EXPECT_TRUE(generator_.HasQueuedFrames());
 395 }
 396
 397 TEST_F(QuicPacketGeneratorTest, ConsumeData_WritableAndShouldFlush) {
 398   delegate_.SetCanWriteAnything();
 399
 400   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 401       DoAll(SaveArg<0>(&packet_), Return(true)));
 402   QuicConsumedData consumed = generator_.ConsumeData(
 403       kHeadersStreamId, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
 404   EXPECT_EQ(3u, consumed.bytes_consumed);
 405   EXPECT_TRUE(consumed.fin_consumed);
 406   EXPECT_FALSE(generator_.HasQueuedFrames());
 407
 408   PacketContents contents;
 409   contents.num_stream_frames = 1;
 410   CheckPacketContains(contents, packet_);
 411 }
 412
 413 TEST_F(QuicPacketGeneratorTest,
 414        ConsumeDataMultipleTimes_WritableAndShouldNotFlush) {
 415   delegate_.SetCanWriteAnything();
 416   generator_.StartBatchOperations();
 417
 418   generator_.ConsumeData(kHeadersStreamId, MakeIOVector("foo"), 2, true,
 419                          MAY_FEC_PROTECT, NULL);
 420   QuicConsumedData consumed = generator_.ConsumeData(
 421       3, MakeIOVector("quux"), 7, false, MAY_FEC_PROTECT, NULL);
 422   EXPECT_EQ(4u, consumed.bytes_consumed);
 423   EXPECT_FALSE(consumed.fin_consumed);
 424   EXPECT_TRUE(generator_.HasQueuedFrames());
 425 }
 426
 427 TEST_F(QuicPacketGeneratorTest, ConsumeData_BatchOperations) {
 428   delegate_.SetCanWriteAnything();
 429   generator_.StartBatchOperations();
 430
 431   generator_.ConsumeData(kHeadersStreamId, MakeIOVector("foo"), 2, true,
 432                          MAY_FEC_PROTECT, NULL);
 433   QuicConsumedData consumed = generator_.ConsumeData(
 434       3, MakeIOVector("quux"), 7, false, MAY_FEC_PROTECT, NULL);
 435   EXPECT_EQ(4u, consumed.bytes_consumed);
 436   EXPECT_FALSE(consumed.fin_consumed);
 437   EXPECT_TRUE(generator_.HasQueuedFrames());
 438
 439   // Now both frames will be flushed out.
 440   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 441       DoAll(SaveArg<0>(&packet_), Return(true)));
 442   generator_.FinishBatchOperations();
 443   EXPECT_FALSE(generator_.HasQueuedFrames());
 444
 445   PacketContents contents;
 446   contents.num_stream_frames = 2;
 447   CheckPacketContains(contents, packet_);
 448 }
 449
 450 TEST_F(QuicPacketGeneratorTest, ConsumeDataFEC) {
 451   delegate_.SetCanWriteAnything();
 452
 453   // Send FEC every two packets.
 454   creator_->set_max_packets_per_fec_group(2);
 455
 456   {
 457     InSequence dummy;
 458     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 459         DoAll(SaveArg<0>(&packet_), Return(true)));
 460     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 461         DoAll(SaveArg<0>(&packet2_), Return(true)));
 462     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 463         DoAll(SaveArg<0>(&packet3_), Return(true)));
 464     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 465         DoAll(SaveArg<0>(&packet4_), Return(true)));
 466     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 467         DoAll(SaveArg<0>(&packet5_), Return(true)));
 468   }
 469
 470   // Send enough data to create 3 packets: two full and one partial. Send
 471   // with MUST_FEC_PROTECT flag.
 472   size_t data_len = 2 * kDefaultMaxPacketSize + 100;
 473   QuicConsumedData consumed =
 474       generator_.ConsumeData(3, CreateData(data_len), 0, true,
 475                              MUST_FEC_PROTECT, NULL);
 476   EXPECT_EQ(data_len, consumed.bytes_consumed);
 477   EXPECT_TRUE(consumed.fin_consumed);
 478   EXPECT_FALSE(generator_.HasQueuedFrames());
 479
 480   CheckPacketHasSingleStreamFrame(packet_);
 481   CheckPacketHasSingleStreamFrame(packet2_);
 482   CheckPacketIsFec(packet3_, 1);
 483
 484   CheckPacketHasSingleStreamFrame(packet4_);
 485   CheckPacketIsFec(packet5_, 4);
 486 }
 487
 488 TEST_F(QuicPacketGeneratorTest, ConsumeDataSendsFecAtEnd) {
 489   delegate_.SetCanWriteAnything();
 490
 491   // Enable FEC.
 492   creator_->set_max_packets_per_fec_group(6);
 493   {
 494     InSequence dummy;
 495     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 496         DoAll(SaveArg<0>(&packet_), Return(true)));
 497     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 498         DoAll(SaveArg<0>(&packet2_), Return(true)));
 499     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 500         DoAll(SaveArg<0>(&packet3_), Return(true)));
 501   }
 502
 503   // Send enough data to create 2 packets: one full and one partial. Send
 504   // with MUST_FEC_PROTECT flag.
 505   size_t data_len = 1 * kDefaultMaxPacketSize + 100;
 506   QuicConsumedData consumed =
 507       generator_.ConsumeData(3, CreateData(data_len), 0, true,
 508                              MUST_FEC_PROTECT, NULL);
 509   EXPECT_EQ(data_len, consumed.bytes_consumed);
 510   EXPECT_TRUE(consumed.fin_consumed);
 511   EXPECT_FALSE(generator_.HasQueuedFrames());
 512
 513   CheckPacketHasSingleStreamFrame(packet_);
 514   CheckPacketHasSingleStreamFrame(packet2_);
 515   CheckPacketIsFec(packet3_, 1);
 516 }
 517
 518 TEST_F(QuicPacketGeneratorTest, ConsumeData_FramesPreviouslyQueued) {
 519   // Set the packet size be enough for two stream frames with 0 stream offset,
 520   // but not enough for a stream frame of 0 offset and one with non-zero offset.
 521   size_t length =
 522       NullEncrypter().GetCiphertextSize(0) +
 523       GetPacketHeaderSize(creator_->connection_id_length(),
 524                           true,
 525                           creator_->next_sequence_number_length(),
 526                           NOT_IN_FEC_GROUP) +
 527       // Add an extra 3 bytes for the payload and 1 byte so BytesFree is larger
 528       // than the GetMinStreamFrameSize.
 529       QuicFramer::GetMinStreamFrameSize(1, 0, false, NOT_IN_FEC_GROUP) + 3 +
 530       QuicFramer::GetMinStreamFrameSize(1, 0, true, NOT_IN_FEC_GROUP) + 1;
 531   creator_->set_max_packet_length(length);
 532   delegate_.SetCanWriteAnything();
 533   {
 534      InSequence dummy;
 535      EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 536          DoAll(SaveArg<0>(&packet_), Return(true)));
 537      EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 538          DoAll(SaveArg<0>(&packet2_), Return(true)));
 539   }
 540   generator_.StartBatchOperations();
 541   // Queue enough data to prevent a stream frame with a non-zero offset from
 542   // fitting.
 543   QuicConsumedData consumed = generator_.ConsumeData(
 544       kHeadersStreamId, MakeIOVector("foo"), 0, false, MAY_FEC_PROTECT, NULL);
 545   EXPECT_EQ(3u, consumed.bytes_consumed);
 546   EXPECT_FALSE(consumed.fin_consumed);
 547   EXPECT_TRUE(generator_.HasQueuedFrames());
 548
 549   // This frame will not fit with the existing frame, causing the queued frame
 550   // to be serialized, and it will not fit with another frame like it, so it is
 551   // serialized by itself.
 552   consumed = generator_.ConsumeData(kHeadersStreamId, MakeIOVector("bar"), 3,
 553                                     true, MAY_FEC_PROTECT, NULL);
 554   EXPECT_EQ(3u, consumed.bytes_consumed);
 555   EXPECT_TRUE(consumed.fin_consumed);
 556   EXPECT_FALSE(generator_.HasQueuedFrames());
 557
 558   PacketContents contents;
 559   contents.num_stream_frames = 1;
 560   CheckPacketContains(contents, packet_);
 561   CheckPacketContains(contents, packet2_);
 562 }
 563
 564 TEST_F(QuicPacketGeneratorTest, FecGroupSizeOnCongestionWindowChange) {
 565   delegate_.SetCanWriteAnything();
 566   creator_->set_max_packets_per_fec_group(50);
 567   EXPECT_EQ(50u, creator_->max_packets_per_fec_group());
 568   EXPECT_FALSE(creator_->IsFecGroupOpen());
 569
 570   // On reduced cwnd.
 571   generator_.OnCongestionWindowChange(7 * kDefaultTCPMSS);
 572   EXPECT_EQ(3u, creator_->max_packets_per_fec_group());
 573
 574   // On increased cwnd.
 575   generator_.OnCongestionWindowChange(100 * kDefaultTCPMSS);
 576   EXPECT_EQ(50u, creator_->max_packets_per_fec_group());
 577
 578   // On collapsed cwnd.
 579   generator_.OnCongestionWindowChange(1 * kDefaultTCPMSS);
 580   EXPECT_EQ(2u, creator_->max_packets_per_fec_group());
 581 }
 582
 583 TEST_F(QuicPacketGeneratorTest, FecGroupSizeChangeWithOpenGroup) {
 584   delegate_.SetCanWriteAnything();
 585   // TODO(jri): This starting of batch mode should not be required when
 586   // FEC sending is separated from batching operations.
 587   generator_.StartBatchOperations();
 588   creator_->set_max_packets_per_fec_group(50);
 589   EXPECT_EQ(50u, creator_->max_packets_per_fec_group());
 590   EXPECT_FALSE(creator_->IsFecGroupOpen());
 591
 592   // Send enough data to create 4 packets with MUST_FEC_PROTECT flag.
 593   // 3 packets are sent, one is queued in the creator.
 594   {
 595     InSequence dummy;
 596     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 597         DoAll(SaveArg<0>(&packet_), Return(true)));
 598     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 599         DoAll(SaveArg<0>(&packet2_), Return(true)));
 600     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 601         DoAll(SaveArg<0>(&packet3_), Return(true)));
 602   }
 603   size_t data_len = 3 * kDefaultMaxPacketSize + 1;
 604   QuicConsumedData consumed = generator_.ConsumeData(
 605       7, CreateData(data_len), 0, true, MUST_FEC_PROTECT, NULL);
 606   EXPECT_EQ(data_len, consumed.bytes_consumed);
 607   EXPECT_TRUE(creator_->IsFecGroupOpen());
 608
 609   // Change FEC groupsize.
 610   generator_.OnCongestionWindowChange(2 * kDefaultTCPMSS);
 611   EXPECT_EQ(2u, creator_->max_packets_per_fec_group());
 612
 613   // Send enough data to trigger one unprotected data packet,
 614   // causing the FEC packet to also be sent.
 615   {
 616     InSequence dummy;
 617     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 618         DoAll(SaveArg<0>(&packet4_), Return(true)));
 619     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 620         DoAll(SaveArg<0>(&packet5_), Return(true)));
 621   }
 622   consumed = generator_.ConsumeData(7, CreateData(kDefaultMaxPacketSize), 0,
 623                                     true, MAY_FEC_PROTECT, NULL);
 624   EXPECT_EQ(kDefaultMaxPacketSize, consumed.bytes_consumed);
 625   // Verify that one FEC packet was sent.
 626   CheckPacketIsFec(packet5_, /*fec_group=*/1u);
 627   EXPECT_FALSE(creator_->IsFecGroupOpen());
 628   EXPECT_FALSE(creator_->IsFecProtected());
 629 }
 630
 631 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOff) {
 632   delegate_.SetCanWriteAnything();
 633   creator_->set_max_packets_per_fec_group(2);
 634   EXPECT_FALSE(creator_->IsFecProtected());
 635
 636   // Send one unprotected data packet.
 637   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 638         DoAll(SaveArg<0>(&packet_), Return(true)));
 639   QuicConsumedData consumed =
 640       generator_.ConsumeData(5, CreateData(1u), 0, true, MAY_FEC_PROTECT,
 641                              NULL);
 642   EXPECT_EQ(1u, consumed.bytes_consumed);
 643   EXPECT_FALSE(generator_.HasQueuedFrames());
 644   EXPECT_FALSE(creator_->IsFecProtected());
 645   // Verify that one data packet was sent.
 646   PacketContents contents;
 647   contents.num_stream_frames = 1;
 648   CheckPacketContains(contents, packet_);
 649
 650   {
 651     InSequence dummy;
 652     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 653         DoAll(SaveArg<0>(&packet2_), Return(true)));
 654     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 655         DoAll(SaveArg<0>(&packet3_), Return(true)));
 656     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 657         DoAll(SaveArg<0>(&packet4_), Return(true)));
 658     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 659         DoAll(SaveArg<0>(&packet5_), Return(true)));
 660     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 661         DoAll(SaveArg<0>(&packet6_), Return(true)));
 662   }
 663   // Send enough data to create 3 packets with MUST_FEC_PROTECT flag.
 664   size_t data_len = 2 * kDefaultMaxPacketSize + 100;
 665   consumed = generator_.ConsumeData(7, CreateData(data_len), 0, true,
 666                                     MUST_FEC_PROTECT, NULL);
 667   EXPECT_EQ(data_len, consumed.bytes_consumed);
 668   EXPECT_FALSE(generator_.HasQueuedFrames());
 669
 670   // Verify that two FEC packets were sent.
 671   CheckPacketHasSingleStreamFrame(packet2_);
 672   CheckPacketHasSingleStreamFrame(packet3_);
 673   CheckPacketIsFec(packet4_, /*fec_group=*/2u);
 674   CheckPacketHasSingleStreamFrame(packet5_);
 675   CheckPacketIsFec(packet6_, /*fec_group=*/5u);  // Sent at the end of stream.
 676
 677   // Send one unprotected data packet.
 678   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 679         DoAll(SaveArg<0>(&packet7_), Return(true)));
 680   consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
 681                                     MAY_FEC_PROTECT, NULL);
 682   EXPECT_EQ(1u, consumed.bytes_consumed);
 683   EXPECT_FALSE(generator_.HasQueuedFrames());
 684   EXPECT_FALSE(creator_->IsFecProtected());
 685   // Verify that one unprotected data packet was sent.
 686   CheckPacketContains(contents, packet7_);
 687 }
 688
 689 TEST_F(QuicPacketGeneratorTest, SwitchFecOnWithPendingFrameInCreator) {
 690   delegate_.SetCanWriteAnything();
 691   // Enable FEC.
 692   creator_->set_max_packets_per_fec_group(2);
 693
 694   generator_.StartBatchOperations();
 695   // Queue enough data to prevent a stream frame with a non-zero offset from
 696   // fitting.
 697   QuicConsumedData consumed = generator_.ConsumeData(
 698       7, CreateData(1u), 0, true, MAY_FEC_PROTECT, NULL);
 699   EXPECT_EQ(1u, consumed.bytes_consumed);
 700   EXPECT_TRUE(creator_->HasPendingFrames());
 701
 702   // Queue protected data for sending. Should cause queued frames to be flushed.
 703   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 704       DoAll(SaveArg<0>(&packet_), Return(true)));
 705   EXPECT_FALSE(creator_->IsFecProtected());
 706   consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
 707                                     MUST_FEC_PROTECT, NULL);
 708   EXPECT_EQ(1u, consumed.bytes_consumed);
 709   PacketContents contents;
 710   contents.num_stream_frames = 1;
 711   // Transmitted packet was not FEC protected.
 712   CheckPacketContains(contents, packet_);
 713   EXPECT_TRUE(creator_->IsFecProtected());
 714   EXPECT_TRUE(creator_->HasPendingFrames());
 715 }
 716
 717 TEST_F(QuicPacketGeneratorTest, SwitchFecOnWithPendingFramesInGenerator) {
 718   // Enable FEC.
 719   creator_->set_max_packets_per_fec_group(2);
 720
 721   // Queue control frames in generator.
 722   delegate_.SetCanNotWrite();
 723   generator_.SetShouldSendAck(true, true);
 724   delegate_.SetCanWriteAnything();
 725   generator_.StartBatchOperations();
 726
 727   // Set up frames to write into the creator when control frames are written.
 728   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 729   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
 730       Return(CreateFeedbackFrame()));
 731   EXPECT_CALL(delegate_, CreateStopWaitingFrame()).WillOnce(
 732       Return(CreateStopWaitingFrame()));
 733
 734   // Generator should have queued control frames, and creator should be empty.
 735   EXPECT_TRUE(generator_.HasQueuedFrames());
 736   EXPECT_FALSE(creator_->HasPendingFrames());
 737   EXPECT_FALSE(creator_->IsFecProtected());
 738
 739   // Queue protected data for sending. Should cause queued frames to be flushed.
 740   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 741       DoAll(SaveArg<0>(&packet_), Return(true)));
 742   QuicConsumedData consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
 743                                                      MUST_FEC_PROTECT, NULL);
 744   EXPECT_EQ(1u, consumed.bytes_consumed);
 745   PacketContents contents;
 746   contents.num_ack_frames = 1;
 747   contents.num_feedback_frames = 1;
 748   contents.num_stop_waiting_frames = 1;
 749   CheckPacketContains(contents, packet_);
 750
 751   // FEC protection should be on in creator.
 752   EXPECT_TRUE(creator_->IsFecProtected());
 753 }
 754
 755 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffWithSubsequentFramesProtected) {
 756   delegate_.SetCanWriteAnything();
 757
 758   // Enable FEC.
 759   creator_->set_max_packets_per_fec_group(2);
 760   EXPECT_FALSE(creator_->IsFecProtected());
 761
 762   // Queue stream frame to be protected in creator.
 763   generator_.StartBatchOperations();
 764   QuicConsumedData consumed = generator_.ConsumeData(5, CreateData(1u), 0, true,
 765                                                      MUST_FEC_PROTECT, NULL);
 766   EXPECT_EQ(1u, consumed.bytes_consumed);
 767   // Creator has a pending protected frame.
 768   EXPECT_TRUE(creator_->HasPendingFrames());
 769   EXPECT_TRUE(creator_->IsFecProtected());
 770
 771   // Add enough unprotected data to exceed size of current packet, so that
 772   // current packet is sent. Both frames will be sent out in a single packet.
 773   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 774       DoAll(SaveArg<0>(&packet_), Return(true)));
 775   size_t data_len = kDefaultMaxPacketSize;
 776   consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
 777                                     MAY_FEC_PROTECT, NULL);
 778   EXPECT_EQ(data_len, consumed.bytes_consumed);
 779   PacketContents contents;
 780   contents.num_stream_frames = 2u;
 781   contents.fec_group = 1u;
 782   CheckPacketContains(contents, packet_);
 783   // FEC protection should still be on in creator.
 784   EXPECT_TRUE(creator_->IsFecProtected());
 785 }
 786
 787 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffWithSubsequentPacketsProtected) {
 788   delegate_.SetCanWriteAnything();
 789
 790   // Enable FEC.
 791   creator_->set_max_packets_per_fec_group(2);
 792   EXPECT_FALSE(creator_->IsFecProtected());
 793
 794   generator_.StartBatchOperations();
 795   // Send first packet, FEC protected.
 796   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 797       DoAll(SaveArg<0>(&packet_), Return(true)));
 798   // Write enough data to cause a packet to be emitted.
 799   size_t data_len = kDefaultMaxPacketSize;
 800   QuicConsumedData consumed = generator_.ConsumeData(
 801       5, CreateData(data_len), 0, true, MUST_FEC_PROTECT, NULL);
 802   EXPECT_EQ(data_len, consumed.bytes_consumed);
 803   PacketContents contents;
 804   contents.num_stream_frames = 1u;
 805   contents.fec_group = 1u;
 806   CheckPacketContains(contents, packet_);
 807
 808   // FEC should still be on in creator.
 809   EXPECT_TRUE(creator_->IsFecProtected());
 810
 811   // Send enough unprotected data to cause second packet to be sent, which gets
 812   // protected because it happens to fall within an open FEC group. Data packet
 813   // will be followed by FEC packet.
 814   {
 815     InSequence dummy;
 816     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 817         DoAll(SaveArg<0>(&packet2_), Return(true)));
 818     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 819         DoAll(SaveArg<0>(&packet3_), Return(true)));
 820   }
 821   consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
 822                                     MAY_FEC_PROTECT, NULL);
 823   EXPECT_EQ(data_len, consumed.bytes_consumed);
 824   contents.num_stream_frames = 2u;
 825   CheckPacketContains(contents, packet2_);
 826   CheckPacketIsFec(packet3_, /*fec_group=*/1u);
 827
 828   // FEC protection should be off in creator.
 829   EXPECT_FALSE(creator_->IsFecProtected());
 830 }
 831
 832 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffThenOnWithCreatorProtectionOn) {
 833   delegate_.SetCanWriteAnything();
 834   generator_.StartBatchOperations();
 835
 836   // Enable FEC.
 837   creator_->set_max_packets_per_fec_group(2);
 838   EXPECT_FALSE(creator_->IsFecProtected());
 839
 840   // Queue one byte of FEC protected data.
 841   QuicConsumedData consumed = generator_.ConsumeData(5, CreateData(1u), 0, true,
 842                                                      MUST_FEC_PROTECT, NULL);
 843   EXPECT_TRUE(creator_->HasPendingFrames());
 844
 845   // Add more unprotected data causing first packet to be sent, FEC protected.
 846   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 847       DoAll(SaveArg<0>(&packet_), Return(true)));
 848   size_t data_len = kDefaultMaxPacketSize;
 849   consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
 850                                     MAY_FEC_PROTECT, NULL);
 851   EXPECT_EQ(data_len, consumed.bytes_consumed);
 852   PacketContents contents;
 853   contents.num_stream_frames = 2u;
 854   contents.fec_group = 1u;
 855   CheckPacketContains(contents, packet_);
 856
 857   // FEC group is still open in creator.
 858   EXPECT_TRUE(creator_->IsFecProtected());
 859
 860   // Add data that should be protected, large enough to cause second packet to
 861   // be sent. Data packet should be followed by FEC packet.
 862   {
 863     InSequence dummy;
 864     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 865         DoAll(SaveArg<0>(&packet2_), Return(true)));
 866     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 867         DoAll(SaveArg<0>(&packet3_), Return(true)));
 868   }
 869   consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
 870                                     MUST_FEC_PROTECT, NULL);
 871   EXPECT_EQ(data_len, consumed.bytes_consumed);
 872   CheckPacketContains(contents, packet2_);
 873   CheckPacketIsFec(packet3_, /*fec_group=*/1u);
 874
 875   // FEC protection should remain on in creator.
 876   EXPECT_TRUE(creator_->IsFecProtected());
 877 }
 878
 879 TEST_F(QuicPacketGeneratorTest, NotWritableThenBatchOperations) {
 880   delegate_.SetCanNotWrite();
 881
 882   generator_.SetShouldSendAck(true, false);
 883   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 884   EXPECT_TRUE(generator_.HasQueuedFrames());
 885
 886   delegate_.SetCanWriteAnything();
 887
 888   generator_.StartBatchOperations();
 889
 890   // When the first write operation is invoked, the ack and feedback
 891   // frames will be returned.
 892   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 893   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
 894       Return(CreateFeedbackFrame()));
 895
 896   // Send some data and a control frame
 897   generator_.ConsumeData(3, MakeIOVector("quux"), 7, false,
 898                          MAY_FEC_PROTECT, NULL);
 899   generator_.AddControlFrame(QuicFrame(CreateGoAwayFrame()));
 900
 901   // All five frames will be flushed out in a single packet.
 902   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 903       DoAll(SaveArg<0>(&packet_), Return(true)));
 904   generator_.FinishBatchOperations();
 905   EXPECT_FALSE(generator_.HasQueuedFrames());
 906
 907   PacketContents contents;
 908   contents.num_ack_frames = 1;
 909   contents.num_goaway_frames = 1;
 910   contents.num_feedback_frames = 1;
 911   contents.num_rst_stream_frames = 1;
 912   contents.num_stream_frames = 1;
 913   CheckPacketContains(contents, packet_);
 914 }
 915
 916 TEST_F(QuicPacketGeneratorTest, NotWritableThenBatchOperations2) {
 917   delegate_.SetCanNotWrite();
 918
 919   generator_.SetShouldSendAck(true, false);
 920   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
 921   EXPECT_TRUE(generator_.HasQueuedFrames());
 922
 923   delegate_.SetCanWriteAnything();
 924
 925   generator_.StartBatchOperations();
 926
 927   // When the first write operation is invoked, the ack and feedback
 928   // frames will be returned.
 929   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
 930   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
 931       Return(CreateFeedbackFrame()));
 932
 933   {
 934     InSequence dummy;
 935   // All five frames will be flushed out in a single packet
 936   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 937       DoAll(SaveArg<0>(&packet_), Return(true)));
 938   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
 939       DoAll(SaveArg<0>(&packet2_), Return(true)));
 940   }
 941
 942   // Send enough data to exceed one packet
 943   size_t data_len = kDefaultMaxPacketSize + 100;
 944   QuicConsumedData consumed =
 945       generator_.ConsumeData(3, CreateData(data_len), 0, true,
 946                              MAY_FEC_PROTECT, NULL);
 947   EXPECT_EQ(data_len, consumed.bytes_consumed);
 948   EXPECT_TRUE(consumed.fin_consumed);
 949   generator_.AddControlFrame(QuicFrame(CreateGoAwayFrame()));
 950
 951   generator_.FinishBatchOperations();
 952   EXPECT_FALSE(generator_.HasQueuedFrames());
 953
 954   // The first packet should have the queued data and part of the stream data.
 955   PacketContents contents;
 956   contents.num_ack_frames = 1;
 957   contents.num_feedback_frames = 1;
 958   contents.num_rst_stream_frames = 1;
 959   contents.num_stream_frames = 1;
 960   CheckPacketContains(contents, packet_);
 961
 962   // The second should have the remainder of the stream data.
 963   PacketContents contents2;
 964   contents2.num_goaway_frames = 1;
 965   contents2.num_stream_frames = 1;
 966   CheckPacketContains(contents2, packet2_);
 967 }
 968
 969 }  // namespace test
 970 }  // namespace net