summaryrefslogtreecommitdiffstats
path: root/third_party/libwebrtc/pc/data_channel_integrationtest.cc
blob: faec76d03e1c87b46322594d9bf4ce163cbe1340 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
/*
 *  Copyright 2012 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 <stdint.h>

#include <cstdlib>
#include <iterator>
#include <string>
#include <tuple>
#include <vector>

#include "absl/algorithm/container.h"
#include "absl/types/optional.h"
#include "api/data_channel_interface.h"
#include "api/dtls_transport_interface.h"
#include "api/peer_connection_interface.h"
#include "api/scoped_refptr.h"
#include "api/sctp_transport_interface.h"
#include "api/stats/rtc_stats_report.h"
#include "api/stats/rtcstats_objects.h"
#include "api/units/time_delta.h"
#include "p2p/base/transport_description.h"
#include "p2p/base/transport_info.h"
#include "pc/media_session.h"
#include "pc/session_description.h"
#include "pc/test/integration_test_helpers.h"
#include "pc/test/mock_peer_connection_observers.h"
#include "rtc_base/copy_on_write_buffer.h"
#include "rtc_base/fake_clock.h"
#include "rtc_base/gunit.h"
#include "rtc_base/helpers.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"
#include "rtc_base/virtual_socket_server.h"
#include "test/gmock.h"
#include "test/gtest.h"

namespace webrtc {

namespace {

// All tests in this file require SCTP support.
#ifdef WEBRTC_HAVE_SCTP

#if defined(WEBRTC_ANDROID)
// Disable heavy tests running on low-end Android devices.
#define DISABLED_ON_ANDROID(t) DISABLED_##t
#else
#define DISABLED_ON_ANDROID(t) t
#endif

class DataChannelIntegrationTest
    : public PeerConnectionIntegrationBaseTest,
      public ::testing::WithParamInterface<std::tuple<SdpSemantics, bool>> {
 protected:
  DataChannelIntegrationTest()
      : PeerConnectionIntegrationBaseTest(std::get<0>(GetParam())),
        allow_media_(std::get<1>(GetParam())) {}
  bool allow_media() { return allow_media_; }

  bool CreatePeerConnectionWrappers() {
    if (allow_media_) {
      return PeerConnectionIntegrationBaseTest::CreatePeerConnectionWrappers();
    }
    return PeerConnectionIntegrationBaseTest::
        CreatePeerConnectionWrappersWithoutMediaEngine();
  }

 private:
  // True if media is allowed to be added
  const bool allow_media_;
};

// Fake clock must be set before threads are started to prevent race on
// Set/GetClockForTesting().
// To achieve that, multiple inheritance is used as a mixin pattern
// where order of construction is finely controlled.
// This also ensures peerconnection is closed before switching back to non-fake
// clock, avoiding other races and DCHECK failures such as in rtp_sender.cc.
class FakeClockForTest : public rtc::ScopedFakeClock {
 protected:
  FakeClockForTest() {
    // Some things use a time of "0" as a special value, so we need to start out
    // the fake clock at a nonzero time.
    // TODO(deadbeef): Fix this.
    AdvanceTime(webrtc::TimeDelta::Seconds(1));
  }

  // Explicit handle.
  ScopedFakeClock& FakeClock() { return *this; }
};

class DataChannelIntegrationTestPlanB
    : public PeerConnectionIntegrationBaseTest {
 protected:
  DataChannelIntegrationTestPlanB()
      : PeerConnectionIntegrationBaseTest(SdpSemantics::kPlanB_DEPRECATED) {}
};

class DataChannelIntegrationTestUnifiedPlan
    : public PeerConnectionIntegrationBaseTest {
 protected:
  DataChannelIntegrationTestUnifiedPlan()
      : PeerConnectionIntegrationBaseTest(SdpSemantics::kUnifiedPlan) {}
};

void MakeActiveSctpOffer(cricket::SessionDescription* desc) {
  auto& transport_infos = desc->transport_infos();
  for (auto& transport_info : transport_infos) {
    transport_info.description.connection_role = cricket::CONNECTIONROLE_ACTIVE;
  }
}

// This test causes a PeerConnection to enter Disconnected state, and
// sends data on a DataChannel while disconnected.
// The data should be surfaced when the connection reestablishes.
TEST_P(DataChannelIntegrationTest, DataChannelWhileDisconnected) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer(), kDefaultTimeout);
  std::string data1 = "hello first";
  caller()->data_channel()->Send(DataBuffer(data1));
  EXPECT_EQ_WAIT(data1, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  // Cause a network outage
  virtual_socket_server()->set_drop_probability(1.0);
  EXPECT_EQ_WAIT(PeerConnectionInterface::kIceConnectionDisconnected,
                 caller()->standardized_ice_connection_state(),
                 kDefaultTimeout);
  std::string data2 = "hello second";
  caller()->data_channel()->Send(DataBuffer(data2));
  // Remove the network outage. The connection should reestablish.
  virtual_socket_server()->set_drop_probability(0.0);
  EXPECT_EQ_WAIT(data2, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
}

// This test causes a PeerConnection to enter Disconnected state,
// sends data on a DataChannel while disconnected, and then triggers
// an ICE restart.
// The data should be surfaced when the connection reestablishes.
TEST_P(DataChannelIntegrationTest, DataChannelWhileDisconnectedIceRestart) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer(), kDefaultTimeout);
  std::string data1 = "hello first";
  caller()->data_channel()->Send(DataBuffer(data1));
  EXPECT_EQ_WAIT(data1, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  // Cause a network outage
  virtual_socket_server()->set_drop_probability(1.0);
  ASSERT_EQ_WAIT(PeerConnectionInterface::kIceConnectionDisconnected,
                 caller()->standardized_ice_connection_state(),
                 kDefaultTimeout);
  std::string data2 = "hello second";
  caller()->data_channel()->Send(DataBuffer(data2));

  // Trigger an ICE restart. The signaling channel is not affected by
  // the network outage.
  caller()->SetOfferAnswerOptions(IceRestartOfferAnswerOptions());
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Remove the network outage. The connection should reestablish.
  virtual_socket_server()->set_drop_probability(0.0);
  EXPECT_EQ_WAIT(data2, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
}

// This test sets up a call between two parties with audio, video and an SCTP
// data channel.
TEST_P(DataChannelIntegrationTest, EndToEndCallWithSctpDataChannel) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Expect that data channel created on caller side will show up for callee as
  // well.
  caller()->CreateDataChannel();
  if (allow_media()) {
    caller()->AddAudioVideoTracks();
    callee()->AddAudioVideoTracks();
  }
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  if (allow_media()) {
    // Ensure the existence of the SCTP data channel didn't impede audio/video.
    MediaExpectations media_expectations;
    media_expectations.ExpectBidirectionalAudioAndVideo();
    ASSERT_TRUE(ExpectNewFrames(media_expectations));
  }
  // Caller data channel should already exist (it created one). Callee data
  // channel may not exist yet, since negotiation happens in-band, not in SDP.
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  // Ensure data can be sent in both directions.
  std::string data = "hello world";
  caller()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  callee()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                 kDefaultTimeout);
}

// This test sets up a call between two parties with an SCTP
// data channel only, and sends messages of various sizes.
TEST_P(DataChannelIntegrationTest,
       EndToEndCallWithSctpDataChannelVariousSizes) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Expect that data channel created on caller side will show up for callee as
  // well.
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Caller data channel should already exist (it created one). Callee data
  // channel may not exist yet, since negotiation happens in-band, not in SDP.
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  for (int message_size = 1; message_size < 100000; message_size *= 2) {
    std::string data(message_size, 'a');
    caller()->data_channel()->Send(DataBuffer(data));
    EXPECT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                   kDefaultTimeout);
    callee()->data_channel()->Send(DataBuffer(data));
    EXPECT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                   kDefaultTimeout);
  }
  // Specifically probe the area around the MTU size.
  for (int message_size = 1100; message_size < 1300; message_size += 1) {
    std::string data(message_size, 'a');
    caller()->data_channel()->Send(DataBuffer(data));
    EXPECT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                   kDefaultTimeout);
    callee()->data_channel()->Send(DataBuffer(data));
    EXPECT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                   kDefaultTimeout);
  }
}

// This test sets up a call between two parties with an SCTP
// data channel only, and sends empty messages
TEST_P(DataChannelIntegrationTest,
       EndToEndCallWithSctpDataChannelEmptyMessages) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Expect that data channel created on caller side will show up for callee as
  // well.
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Caller data channel should already exist (it created one). Callee data
  // channel may not exist yet, since negotiation happens in-band, not in SDP.
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  // Ensure data can be sent in both directions.
  // Sending empty string data
  std::string data = "";
  caller()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  EXPECT_TRUE(callee()->data_observer()->last_message().empty());
  EXPECT_FALSE(callee()->data_observer()->messages().back().binary);
  callee()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(1u, caller()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  EXPECT_TRUE(caller()->data_observer()->last_message().empty());
  EXPECT_FALSE(caller()->data_observer()->messages().back().binary);

  // Sending empty binary data
  rtc::CopyOnWriteBuffer empty_buffer;
  caller()->data_channel()->Send(DataBuffer(empty_buffer, true));
  EXPECT_EQ_WAIT(2u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  EXPECT_TRUE(callee()->data_observer()->last_message().empty());
  EXPECT_TRUE(callee()->data_observer()->messages().back().binary);
  callee()->data_channel()->Send(DataBuffer(empty_buffer, true));
  EXPECT_EQ_WAIT(2u, caller()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  EXPECT_TRUE(caller()->data_observer()->last_message().empty());
  EXPECT_TRUE(caller()->data_observer()->messages().back().binary);
}

TEST_P(DataChannelIntegrationTest,
       EndToEndCallWithSctpDataChannelLowestSafeMtu) {
  // The lowest payload size limit that's tested and found safe for this
  // application. Note that this is not the safe limit under all conditions;
  // in particular, the default is not the largest DTLS signature, and
  // this test does not use TURN.
  const size_t kLowestSafePayloadSizeLimit = 1225;

  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Expect that data channel created on caller side will show up for callee as
  // well.
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Caller data channel should already exist (it created one). Callee data
  // channel may not exist yet, since negotiation happens in-band, not in SDP.
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  virtual_socket_server()->set_max_udp_payload(kLowestSafePayloadSizeLimit);
  for (int message_size = 1140; message_size < 1240; message_size += 1) {
    std::string data(message_size, 'a');
    caller()->data_channel()->Send(DataBuffer(data));
    ASSERT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                   kDefaultTimeout);
    callee()->data_channel()->Send(DataBuffer(data));
    ASSERT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                   kDefaultTimeout);
  }
}

// This test verifies that lowering the MTU of the connection will cause
// the datachannel to not transmit reliably.
// The purpose of this test is to ensure that we know how a too-small MTU
// error manifests itself.
TEST_P(DataChannelIntegrationTest, EndToEndCallWithSctpDataChannelHarmfulMtu) {
  // The lowest payload size limit that's tested and found safe for this
  // application in this configuration (see test above).
  const size_t kLowestSafePayloadSizeLimit = 1225;
  // The size of the smallest message that fails to be delivered.
  const size_t kMessageSizeThatIsNotDelivered = 1157;

  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  virtual_socket_server()->set_max_udp_payload(kLowestSafePayloadSizeLimit - 1);
  // Probe for an undelivered or slowly delivered message. The exact
  // size limit seems to be dependent on the message history, so make the
  // code easily able to find the current value.
  bool failure_seen = false;
  for (size_t message_size = 1110; message_size < 1400; message_size++) {
    const size_t message_count =
        callee()->data_observer()->received_message_count();
    const std::string data(message_size, 'a');
    caller()->data_channel()->Send(DataBuffer(data));
    // Wait a very short time for the message to be delivered.
    // Note: Waiting only 10 ms is too short for Windows bots; they will
    // flakily fail at a random frame.
    WAIT(callee()->data_observer()->received_message_count() > message_count,
         100);
    if (callee()->data_observer()->received_message_count() == message_count) {
      ASSERT_EQ(kMessageSizeThatIsNotDelivered, message_size);
      failure_seen = true;
      break;
    }
  }
  ASSERT_TRUE(failure_seen);
}

// Ensure that when the callee closes an SCTP data channel, the closing
// procedure results in the data channel being closed for the caller as well.
TEST_P(DataChannelIntegrationTest, CalleeClosesSctpDataChannel) {
  // Same procedure as above test.
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  if (allow_media()) {
    caller()->AddAudioVideoTracks();
    callee()->AddAudioVideoTracks();
  }
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  // Close the data channel on the callee side, and wait for it to reach the
  // "closed" state on both sides.
  callee()->data_channel()->Close();

  DataChannelInterface::DataState expected_states[] = {
      DataChannelInterface::DataState::kConnecting,
      DataChannelInterface::DataState::kOpen,
      DataChannelInterface::DataState::kClosing,
      DataChannelInterface::DataState::kClosed};

  EXPECT_EQ_WAIT(DataChannelInterface::DataState::kClosed,
                 caller()->data_observer()->state(), kDefaultTimeout);
  EXPECT_THAT(caller()->data_observer()->states(),
              ::testing::ElementsAreArray(expected_states));

  EXPECT_EQ_WAIT(DataChannelInterface::DataState::kClosed,
                 callee()->data_observer()->state(), kDefaultTimeout);
  EXPECT_THAT(callee()->data_observer()->states(),
              ::testing::ElementsAreArray(expected_states));
}

TEST_P(DataChannelIntegrationTest, SctpDataChannelConfigSentToOtherSide) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  webrtc::DataChannelInit init;
  init.id = 53;
  init.maxRetransmits = 52;
  caller()->CreateDataChannel("data-channel", &init);
  if (allow_media()) {
    caller()->AddAudioVideoTracks();
    callee()->AddAudioVideoTracks();
  }
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  // Since "negotiated" is false, the "id" parameter should be ignored.
  EXPECT_NE(init.id, callee()->data_channel()->id());
  EXPECT_EQ("data-channel", callee()->data_channel()->label());
  EXPECT_EQ(init.maxRetransmits, callee()->data_channel()->maxRetransmits());
  EXPECT_FALSE(callee()->data_channel()->negotiated());
}

// Test sctp's ability to process unordered data stream, where data actually
// arrives out of order using simulated delays. Previously there have been some
// bugs in this area.
TEST_P(DataChannelIntegrationTest, StressTestUnorderedSctpDataChannel) {
  // Introduce random network delays.
  // Otherwise it's not a true "unordered" test.
  virtual_socket_server()->set_delay_mean(20);
  virtual_socket_server()->set_delay_stddev(5);
  virtual_socket_server()->UpdateDelayDistribution();
  // Normal procedure, but with unordered data channel config.
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  webrtc::DataChannelInit init;
  init.ordered = false;
  caller()->CreateDataChannel(&init);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  static constexpr int kNumMessages = 100;
  // Deliberately chosen to be larger than the MTU so messages get fragmented.
  static constexpr size_t kMaxMessageSize = 4096;
  // Create and send random messages.
  std::vector<std::string> sent_messages;
  for (int i = 0; i < kNumMessages; ++i) {
    size_t length =
        (rand() % kMaxMessageSize) + 1;  // NOLINT (rand_r instead of rand)
    std::string message;
    ASSERT_TRUE(rtc::CreateRandomString(length, &message));
    caller()->data_channel()->Send(DataBuffer(message));
    callee()->data_channel()->Send(DataBuffer(message));
    sent_messages.push_back(message);
  }

  // Wait for all messages to be received.
  EXPECT_EQ_WAIT(rtc::checked_cast<size_t>(kNumMessages),
                 caller()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  EXPECT_EQ_WAIT(rtc::checked_cast<size_t>(kNumMessages),
                 callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);

  // Sort and compare to make sure none of the messages were corrupted.
  std::vector<std::string> caller_received_messages;
  absl::c_transform(caller()->data_observer()->messages(),
                    std::back_inserter(caller_received_messages),
                    [](const auto& a) { return a.data; });

  std::vector<std::string> callee_received_messages;
  absl::c_transform(callee()->data_observer()->messages(),
                    std::back_inserter(callee_received_messages),
                    [](const auto& a) { return a.data; });

  absl::c_sort(sent_messages);
  absl::c_sort(caller_received_messages);
  absl::c_sort(callee_received_messages);
  EXPECT_EQ(sent_messages, caller_received_messages);
  EXPECT_EQ(sent_messages, callee_received_messages);
}

// Repeatedly open and close data channels on a peer connection to check that
// the channels are properly negotiated and SCTP stream IDs properly recycled.
TEST_P(DataChannelIntegrationTest, StressTestOpenCloseChannelNoDelay) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();

  int channel_id = 0;
  const size_t kChannelCount = 8;
  const size_t kIterations = 10;
  bool has_negotiated = false;

  webrtc::DataChannelInit init;
  for (size_t repeats = 0; repeats < kIterations; ++repeats) {
    RTC_LOG(LS_INFO) << "Iteration " << (repeats + 1) << "/" << kIterations;

    for (size_t i = 0; i < kChannelCount; ++i) {
      rtc::StringBuilder sb;
      sb << "channel-" << channel_id++;
      caller()->CreateDataChannel(sb.Release(), &init);
    }
    ASSERT_EQ(caller()->data_channels().size(), kChannelCount);

    if (!has_negotiated) {
      caller()->CreateAndSetAndSignalOffer();
      ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
      has_negotiated = true;
    }

    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(caller()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kOpen, kDefaultTimeout);
      RTC_LOG(LS_INFO) << "Caller Channel "
                       << caller()->data_channels()[i]->label() << " with id "
                       << caller()->data_channels()[i]->id() << " is open.";
    }
    ASSERT_EQ_WAIT(callee()->data_channels().size(), kChannelCount,
                   kDefaultTimeout);
    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(callee()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kOpen, kDefaultTimeout);
      RTC_LOG(LS_INFO) << "Callee Channel "
                       << callee()->data_channels()[i]->label() << " with id "
                       << callee()->data_channels()[i]->id() << " is open.";
    }

    // Closing from both sides to attempt creating races.
    // A real application would likely only close from one side.
    for (size_t i = 0; i < kChannelCount; ++i) {
      if (i % 3 == 0) {
        callee()->data_channels()[i]->Close();
        caller()->data_channels()[i]->Close();
      } else {
        caller()->data_channels()[i]->Close();
        callee()->data_channels()[i]->Close();
      }
    }

    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(caller()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kClosed, kDefaultTimeout);
      ASSERT_EQ_WAIT(callee()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kClosed, kDefaultTimeout);
    }

    caller()->data_channels().clear();
    caller()->data_observers().clear();
    callee()->data_channels().clear();
    callee()->data_observers().clear();
  }
}

// Repeatedly open and close data channels on a peer connection to check that
// the channels are properly negotiated and SCTP stream IDs properly recycled.
// Some delay is added for better coverage.
TEST_P(DataChannelIntegrationTest, StressTestOpenCloseChannelWithDelay) {
  // Simulate some network delay
  virtual_socket_server()->set_delay_mean(20);
  virtual_socket_server()->set_delay_stddev(5);
  virtual_socket_server()->UpdateDelayDistribution();

  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();

  int channel_id = 0;
  const size_t kChannelCount = 8;
  const size_t kIterations = 10;
  bool has_negotiated = false;

  webrtc::DataChannelInit init;
  for (size_t repeats = 0; repeats < kIterations; ++repeats) {
    RTC_LOG(LS_INFO) << "Iteration " << (repeats + 1) << "/" << kIterations;

    for (size_t i = 0; i < kChannelCount; ++i) {
      rtc::StringBuilder sb;
      sb << "channel-" << channel_id++;
      caller()->CreateDataChannel(sb.Release(), &init);
    }
    ASSERT_EQ(caller()->data_channels().size(), kChannelCount);

    if (!has_negotiated) {
      caller()->CreateAndSetAndSignalOffer();
      ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
      has_negotiated = true;
    }

    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(caller()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kOpen, kDefaultTimeout);
      RTC_LOG(LS_INFO) << "Caller Channel "
                       << caller()->data_channels()[i]->label() << " with id "
                       << caller()->data_channels()[i]->id() << " is open.";
    }
    ASSERT_EQ_WAIT(callee()->data_channels().size(), kChannelCount,
                   kDefaultTimeout);
    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(callee()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kOpen, kDefaultTimeout);
      RTC_LOG(LS_INFO) << "Callee Channel "
                       << callee()->data_channels()[i]->label() << " with id "
                       << callee()->data_channels()[i]->id() << " is open.";
    }

    // Closing from both sides to attempt creating races.
    // A real application would likely only close from one side.
    for (size_t i = 0; i < kChannelCount; ++i) {
      if (i % 3 == 0) {
        callee()->data_channels()[i]->Close();
        caller()->data_channels()[i]->Close();
      } else {
        caller()->data_channels()[i]->Close();
        callee()->data_channels()[i]->Close();
      }
    }

    for (size_t i = 0; i < kChannelCount; ++i) {
      ASSERT_EQ_WAIT(caller()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kClosed, kDefaultTimeout);
      ASSERT_EQ_WAIT(callee()->data_channels()[i]->state(),
                     DataChannelInterface::DataState::kClosed, kDefaultTimeout);
    }

    caller()->data_channels().clear();
    caller()->data_observers().clear();
    callee()->data_channels().clear();
    callee()->data_observers().clear();
  }
}

// This test sets up a call between two parties with audio, and video. When
// audio and video are setup and flowing, an SCTP data channel is negotiated.
TEST_P(DataChannelIntegrationTest, AddSctpDataChannelInSubsequentOffer) {
  // This test can't be performed without media.
  if (!allow_media()) {
    return;
  }
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Do initial offer/answer with audio/video.
  caller()->AddAudioVideoTracks();
  callee()->AddAudioVideoTracks();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Create data channel and do new offer and answer.
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Caller data channel should already exist (it created one). Callee data
  // channel may not exist yet, since negotiation happens in-band, not in SDP.
  ASSERT_NE(nullptr, caller()->data_channel());
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  // Ensure data can be sent in both directions.
  std::string data = "hello world";
  caller()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  callee()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                 kDefaultTimeout);
}

// Set up a connection initially just using SCTP data channels, later
// upgrading to audio/video, ensuring frames are received end-to-end.
// Effectively the inverse of the test above. This was broken in M57; see
// https://crbug.com/711243
TEST_P(DataChannelIntegrationTest, SctpDataChannelToAudioVideoUpgrade) {
  // This test can't be performed without media.
  if (!allow_media()) {
    return;
  }
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  // Do initial offer/answer with just data channel.
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  // Wait until data can be sent over the data channel.
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  // Do subsequent offer/answer with two-way audio and video. Audio and video
  // should end up bundled on the DTLS/ICE transport already used for data.
  caller()->AddAudioVideoTracks();
  callee()->AddAudioVideoTracks();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  MediaExpectations media_expectations;
  media_expectations.ExpectBidirectionalAudioAndVideo();
  ASSERT_TRUE(ExpectNewFrames(media_expectations));
}

static void MakeSpecCompliantSctpOffer(cricket::SessionDescription* desc) {
  cricket::SctpDataContentDescription* dcd_offer =
      GetFirstSctpDataContentDescription(desc);
  // See https://crbug.com/webrtc/11211 - this function is a no-op
  ASSERT_TRUE(dcd_offer);
  dcd_offer->set_use_sctpmap(false);
  dcd_offer->set_protocol("UDP/DTLS/SCTP");
}

// Test that the data channel works when a spec-compliant SCTP m= section is
// offered (using "a=sctp-port" instead of "a=sctpmap", and using
// "UDP/DTLS/SCTP" as the protocol).
TEST_P(DataChannelIntegrationTest,
       DataChannelWorksWhenSpecCompliantSctpOfferReceived) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->SetGeneratedSdpMunger(MakeSpecCompliantSctpOffer);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel() != nullptr, kDefaultTimeout);
  EXPECT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);

  // Ensure data can be sent in both directions.
  std::string data = "hello world";
  caller()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  callee()->data_channel()->Send(DataBuffer(data));
  EXPECT_EQ_WAIT(data, caller()->data_observer()->last_message(),
                 kDefaultTimeout);
}

// Test that after closing PeerConnections, they stop sending any packets
// (ICE, DTLS, RTP...).
TEST_P(DataChannelIntegrationTest, ClosingConnectionStopsPacketFlow) {
  // This test can't be performed without media.
  if (!allow_media()) {
    return;
  }
  // Set up audio/video/data, wait for some frames to be received.
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->AddAudioVideoTracks();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  MediaExpectations media_expectations;
  media_expectations.CalleeExpectsSomeAudioAndVideo();
  ASSERT_TRUE(ExpectNewFrames(media_expectations));
  // Close PeerConnections.
  ClosePeerConnections();
  // Pump messages for a second, and ensure no new packets end up sent.
  uint32_t sent_packets_a = virtual_socket_server()->sent_packets();
  WAIT(false, 1000);
  uint32_t sent_packets_b = virtual_socket_server()->sent_packets();
  EXPECT_EQ(sent_packets_a, sent_packets_b);
}

TEST_P(DataChannelIntegrationTest, DtlsRoleIsSetNormally) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  ASSERT_FALSE(caller()->pc()->GetSctpTransport());
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_TRUE(caller()->pc()->GetSctpTransport());
  ASSERT_TRUE(
      caller()->pc()->GetSctpTransport()->Information().dtls_transport());
  EXPECT_TRUE(caller()
                  ->pc()
                  ->GetSctpTransport()
                  ->Information()
                  .dtls_transport()
                  ->Information()
                  .role());
  EXPECT_EQ(caller()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kServer);
  EXPECT_EQ(callee()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kClient);
  // ID should be assigned according to the odd/even rule based on role;
  // client gets even numbers, server gets odd ones. RFC 8832 section 6.
  // TODO(hta): Test multiple channels.
  EXPECT_EQ(caller()->data_channel()->id(), 1);
}

TEST_P(DataChannelIntegrationTest, DtlsRoleIsSetWhenReversed) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  callee()->SetReceivedSdpMunger(MakeActiveSctpOffer);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  EXPECT_TRUE(caller()
                  ->pc()
                  ->GetSctpTransport()
                  ->Information()
                  .dtls_transport()
                  ->Information()
                  .role());
  EXPECT_EQ(caller()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kClient);
  EXPECT_EQ(callee()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kServer);
  // ID should be assigned according to the odd/even rule based on role;
  // client gets even numbers, server gets odd ones. RFC 8832 section 6.
  // TODO(hta): Test multiple channels.
  EXPECT_EQ(caller()->data_channel()->id(), 0);
}

TEST_P(DataChannelIntegrationTest,
       DtlsRoleIsSetWhenReversedWithChannelCollision) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();

  callee()->SetReceivedSdpMunger([this](cricket::SessionDescription* desc) {
    MakeActiveSctpOffer(desc);
    callee()->CreateDataChannel();
  });
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_EQ_WAIT(callee()->data_channels().size(), 2U, kDefaultTimeout);
  ASSERT_EQ_WAIT(caller()->data_channels().size(), 2U, kDefaultTimeout);
  EXPECT_TRUE(caller()
                  ->pc()
                  ->GetSctpTransport()
                  ->Information()
                  .dtls_transport()
                  ->Information()
                  .role());
  EXPECT_EQ(caller()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kClient);
  EXPECT_EQ(callee()
                ->pc()
                ->GetSctpTransport()
                ->Information()
                .dtls_transport()
                ->Information()
                .role(),
            DtlsTransportTlsRole::kServer);
  // ID should be assigned according to the odd/even rule based on role;
  // client gets even numbers, server gets odd ones. RFC 8832 section 6.
  ASSERT_EQ(caller()->data_channels().size(), 2U);
  ASSERT_EQ(callee()->data_channels().size(), 2U);
  EXPECT_EQ(caller()->data_channels()[0]->id(), 0);
  EXPECT_EQ(caller()->data_channels()[1]->id(), 1);
  EXPECT_EQ(callee()->data_channels()[0]->id(), 1);
  EXPECT_EQ(callee()->data_channels()[1]->id(), 0);
}

// Test that transport stats are generated by the RTCStatsCollector for a
// connection that only involves data channels. This is a regression test for
// crbug.com/826972.
TEST_P(DataChannelIntegrationTest,
       TransportStatsReportedForDataChannelOnlyConnection) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();

  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);

  auto caller_report = caller()->NewGetStats();
  EXPECT_EQ(1u, caller_report->GetStatsOfType<RTCTransportStats>().size());
  auto callee_report = callee()->NewGetStats();
  EXPECT_EQ(1u, callee_report->GetStatsOfType<RTCTransportStats>().size());
}

TEST_P(DataChannelIntegrationTest, QueuedPacketsGetDeliveredInReliableMode) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);

  caller()->data_channel()->Send(DataBuffer("hello first"));
  ASSERT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  // Cause a temporary network outage
  virtual_socket_server()->set_drop_probability(1.0);
  for (int i = 1; i <= 10; i++) {
    caller()->data_channel()->Send(DataBuffer("Sent while blocked"));
  }
  // Nothing should be delivered during outage. Short wait.
  EXPECT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(), 10);
  // Reverse outage
  virtual_socket_server()->set_drop_probability(0.0);
  // All packets should be delivered.
  EXPECT_EQ_WAIT(11u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
}

TEST_P(DataChannelIntegrationTest, QueuedPacketsGetDroppedInUnreliableMode) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  DataChannelInit init;
  init.maxRetransmits = 0;
  init.ordered = false;
  caller()->CreateDataChannel(&init);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);
  caller()->data_channel()->Send(DataBuffer("hello first"));
  ASSERT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  // Cause a temporary network outage
  virtual_socket_server()->set_drop_probability(1.0);
  // Send a few packets. Note that all get dropped only when all packets
  // fit into the receiver receive window/congestion window, so that they
  // actually get sent.
  for (int i = 1; i <= 10; i++) {
    caller()->data_channel()->Send(DataBuffer("Sent while blocked"));
  }
  // Nothing should be delivered during outage.
  // We do a short wait to verify that delivery count is still 1.
  WAIT(false, 10);
  EXPECT_EQ(1u, callee()->data_observer()->received_message_count());
  // Reverse the network outage.
  virtual_socket_server()->set_drop_probability(0.0);
  // Send a new packet, and wait for it to be delivered.
  caller()->data_channel()->Send(DataBuffer("After block"));
  EXPECT_EQ_WAIT("After block", callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  // Some messages should be lost, but first and last message should have
  // been delivered.
  // First, check that the protocol guarantee is preserved.
  EXPECT_GT(11u, callee()->data_observer()->received_message_count());
  EXPECT_LE(2u, callee()->data_observer()->received_message_count());
  // Then, check that observed behavior (lose all messages) has not changed
  EXPECT_EQ(2u, callee()->data_observer()->received_message_count());
}

TEST_P(DataChannelIntegrationTest,
       QueuedPacketsGetDroppedInLifetimeLimitedMode) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  DataChannelInit init;
  init.maxRetransmitTime = 1;
  init.ordered = false;
  caller()->CreateDataChannel(&init);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);
  caller()->data_channel()->Send(DataBuffer("hello first"));
  ASSERT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  // Cause a temporary network outage
  virtual_socket_server()->set_drop_probability(1.0);
  for (int i = 1; i <= 200; i++) {
    caller()->data_channel()->Send(DataBuffer("Sent while blocked"));
  }
  // Nothing should be delivered during outage.
  // We do a short wait to verify that delivery count is still 1,
  // and to make sure max packet lifetime (which is in ms) is exceeded.
  WAIT(false, 10);
  EXPECT_EQ(1u, callee()->data_observer()->received_message_count());
  // Reverse the network outage.
  virtual_socket_server()->set_drop_probability(0.0);
  // Send a new packet, and wait for it to be delivered.
  caller()->data_channel()->Send(DataBuffer("After block"));
  EXPECT_EQ_WAIT("After block", callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  // Some messages should be lost, but first and last message should have
  // been delivered.
  // First, check that the protocol guarantee is preserved.
  EXPECT_GT(202u, callee()->data_observer()->received_message_count());
  EXPECT_LE(2u, callee()->data_observer()->received_message_count());
  // Then, check that observed behavior (lose some messages) has not changed
  // DcSctp loses all messages. This is correct.
  EXPECT_EQ(2u, callee()->data_observer()->received_message_count());
}

TEST_P(DataChannelIntegrationTest,
       DISABLED_ON_ANDROID(SomeQueuedPacketsGetDroppedInMaxRetransmitsMode)) {
  CreatePeerConnectionWrappers();
  ConnectFakeSignaling();
  DataChannelInit init;
  init.maxRetransmits = 0;
  init.ordered = false;
  caller()->CreateDataChannel(&init);
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);
  caller()->data_channel()->Send(DataBuffer("hello first"));
  ASSERT_EQ_WAIT(1u, callee()->data_observer()->received_message_count(),
                 kDefaultTimeout);
  // Cause a temporary network outage
  virtual_socket_server()->set_drop_probability(1.0);
  // Fill the buffer until queued data starts to build
  size_t packet_counter = 0;
  while (caller()->data_channel()->buffered_amount() < 1 &&
         packet_counter < 10000) {
    packet_counter++;
    caller()->data_channel()->Send(DataBuffer("Sent while blocked"));
  }
  if (caller()->data_channel()->buffered_amount()) {
    RTC_LOG(LS_INFO) << "Buffered data after " << packet_counter << " packets";
  } else {
    RTC_LOG(LS_INFO) << "No buffered data after " << packet_counter
                     << " packets";
  }
  // Nothing should be delivered during outage.
  // We do a short wait to verify that delivery count is still 1.
  WAIT(false, 10);
  EXPECT_EQ(1u, callee()->data_observer()->received_message_count());
  // Reverse the network outage.
  virtual_socket_server()->set_drop_probability(0.0);
  // Send a new packet, and wait for it to be delivered.
  caller()->data_channel()->Send(DataBuffer("After block"));
  EXPECT_EQ_WAIT("After block", callee()->data_observer()->last_message(),
                 kDefaultTimeout);
  // Some messages should be lost, but first and last message should have
  // been delivered.
  // Due to the fact that retransmissions are only counted when the packet
  // goes on the wire, NOT when they are stalled in queue due to
  // congestion, we expect some of the packets to be delivered, because
  // congestion prevented them from being sent.
  // Citation: https://tools.ietf.org/html/rfc7496#section-3.1

  // First, check that the protocol guarantee is preserved.
  EXPECT_GT(packet_counter,
            callee()->data_observer()->received_message_count());
  EXPECT_LE(2u, callee()->data_observer()->received_message_count());
  // Then, check that observed behavior (lose between 100 and 200 messages)
  // has not changed.
  // Usrsctp behavior is different on Android (177) and other platforms (122).
  // Dcsctp loses 432 packets.
  EXPECT_GT(2 + packet_counter - 100,
            callee()->data_observer()->received_message_count());
  EXPECT_LT(2 + packet_counter - 500,
            callee()->data_observer()->received_message_count());
}

INSTANTIATE_TEST_SUITE_P(DataChannelIntegrationTest,
                         DataChannelIntegrationTest,
                         Combine(Values(SdpSemantics::kPlanB_DEPRECATED,
                                        SdpSemantics::kUnifiedPlan),
                                 testing::Bool()));

TEST_F(DataChannelIntegrationTestUnifiedPlan,
       EndToEndCallWithBundledSctpDataChannel) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->AddAudioVideoTracks();
  callee()->AddAudioVideoTracks();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(caller()->pc()->GetSctpTransport(), kDefaultTimeout);
  ASSERT_EQ_WAIT(SctpTransportState::kConnected,
                 caller()->pc()->GetSctpTransport()->Information().state(),
                 kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
}

TEST_F(DataChannelIntegrationTestUnifiedPlan,
       EndToEndCallWithDataChannelOnlyConnects) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_channel(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  ASSERT_TRUE(caller()->data_observer()->IsOpen());
}

TEST_F(DataChannelIntegrationTestUnifiedPlan, DataChannelClosesWhenClosed) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  caller()->data_channel()->Close();
  ASSERT_TRUE_WAIT(!callee()->data_observer()->IsOpen(), kDefaultTimeout);
}

TEST_F(DataChannelIntegrationTestUnifiedPlan,
       DataChannelClosesWhenClosedReverse) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  callee()->data_channel()->Close();
  ASSERT_TRUE_WAIT(!caller()->data_observer()->IsOpen(), kDefaultTimeout);
}

TEST_F(DataChannelIntegrationTestUnifiedPlan,
       DataChannelClosesWhenPeerConnectionClosed) {
  ASSERT_TRUE(CreatePeerConnectionWrappers());
  ConnectFakeSignaling();
  caller()->CreateDataChannel();
  caller()->CreateAndSetAndSignalOffer();
  ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer(), kDefaultTimeout);
  ASSERT_TRUE_WAIT(callee()->data_observer()->IsOpen(), kDefaultTimeout);
  caller()->pc()->Close();
  ASSERT_TRUE_WAIT(!callee()->data_observer()->IsOpen(), kDefaultTimeout);
}

#endif  // WEBRTC_HAVE_SCTP

}  // namespace

}  // namespace webrtc