Reland of: Separating SCTP code from BaseChannel/MediaChannel.

webrtc/media/sctp/sctptransport_unittest.cc

Index: webrtc/media/sctp/sctptransport_unittest.cc
diff --git a/webrtc/media/sctp/sctptransport_unittest.cc b/webrtc/media/sctp/sctptransport_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..42e4dc646f37f1a646bcb101b727bf901df01682
--- /dev/null
+++ b/webrtc/media/sctp/sctptransport_unittest.cc
@@ -0,0 +1,563 @@
+/*
+ *  Copyright (c) 2013 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 <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "webrtc/base/bind.h"
+#include "webrtc/base/copyonwritebuffer.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/base/gunit.h"
+#include "webrtc/base/helpers.h"
+#include "webrtc/base/ssladapter.h"
+#include "webrtc/base/thread.h"
+#include "webrtc/media/sctp/sctptransport.h"
+#include "webrtc/p2p/base/faketransportcontroller.h"
+
+namespace {
+static const int kDefaultTimeout = 10000;  // 10 seconds.
+// Use ports other than the default 5000 for testing.
+static const int kTransport1Port = 5001;
+static const int kTransport2Port = 5002;
+}
+
+namespace cricket {
+
+// This is essentially a buffer to hold recieved data. It stores only the last
+// received data. Calling OnDataReceived twice overwrites old data with the
+// newer one.
+// TODO(ldixon): Implement constraints, and allow new data to be added to old
+// instead of replacing it.
+class SctpFakeDataReceiver : public sigslot::has_slots<> {
+ public:
+  SctpFakeDataReceiver() : received_(false) {}
+
+  void Clear() {
+    received_ = false;
+    last_data_ = "";
+    last_params_ = ReceiveDataParams();
+  }
+
+  virtual void OnDataReceived(const ReceiveDataParams& params,
+                              const rtc::CopyOnWriteBuffer& data) {
+    received_ = true;
+    last_data_ = std::string(data.data<char>(), data.size());
+    last_params_ = params;
+  }
+
+  bool received() const { return received_; }
+  std::string last_data() const { return last_data_; }
+  ReceiveDataParams last_params() const { return last_params_; }
+
+ private:
+  bool received_;
+  std::string last_data_;
+  ReceiveDataParams last_params_;
+};
+
+class SignalReadyToSendObserver : public sigslot::has_slots<> {
+ public:
+  SignalReadyToSendObserver() : signaled_(false) {}
+
+  void OnSignaled() { signaled_ = true; }
+
+  bool IsSignaled() { return signaled_; }
+
+ private:
+  bool signaled_;
+};
+
+class SignalTransportClosedObserver : public sigslot::has_slots<> {
+ public:
+  SignalTransportClosedObserver() {}
+  void BindSelf(SctpTransport* transport) {
+    transport->SignalStreamClosedRemotely.connect(
+        this, &SignalTransportClosedObserver::OnStreamClosed);
+  }
+  void OnStreamClosed(int stream) { streams_.push_back(stream); }
+
+  int StreamCloseCount(int stream) {
+    return std::count(streams_.begin(), streams_.end(), stream);
+  }
+
+  bool WasStreamClosed(int stream) {
+    return std::find(streams_.begin(), streams_.end(), stream) !=
+           streams_.end();
+  }
+
+ private:
+  std::vector<int> streams_;
+};
+
+class SignalTransportClosedReopener : public sigslot::has_slots<> {
+ public:
+  SignalTransportClosedReopener(SctpTransport* transport, SctpTransport* peer)
+      : transport_(transport), peer_(peer) {}
+
+  void OnStreamClosed(int stream) {
+    transport_->OpenStream(stream);
+    peer_->OpenStream(stream);
+    streams_.push_back(stream);
+  }
+
+  int StreamCloseCount(int stream) {
+    return std::count(streams_.begin(), streams_.end(), stream);
+  }
+
+ private:
+  SctpTransport* transport_;
+  SctpTransport* peer_;
+  std::vector<int> streams_;
+};
+
+// SCTP Data Engine testing framework.
+class SctpTransportTest : public testing::Test, public sigslot::has_slots<> {
+ protected:
+  // usrsctp uses the NSS random number generator on non-Android platforms,
+  // so we need to initialize SSL.
+  static void SetUpTestCase() {}
+
+  void SetupConnectedTransportsWithTwoStreams() {
+    fake_dtls1_.reset(new FakeTransportChannel("fake dtls 1", 0));
+    fake_dtls2_.reset(new FakeTransportChannel("fake dtls 2", 0));
+    recv1_.reset(new SctpFakeDataReceiver());
+    recv2_.reset(new SctpFakeDataReceiver());
+    transport1_.reset(CreateTransport(fake_dtls1_.get(), recv1_.get()));
+    transport1_->set_debug_name_for_testing("transport1");
+    transport1_->SignalReadyToSendData.connect(
+        this, &SctpTransportTest::OnChan1ReadyToSend);
+    transport2_.reset(CreateTransport(fake_dtls2_.get(), recv2_.get()));
+    transport2_->set_debug_name_for_testing("transport2");
+    transport2_->SignalReadyToSendData.connect(
+        this, &SctpTransportTest::OnChan2ReadyToSend);
+    // Setup two connected transports ready to send and receive.
+    bool asymmetric = false;
+    fake_dtls1_->SetDestination(fake_dtls2_.get(), asymmetric);
+
+    LOG(LS_VERBOSE) << "Transport setup ----------------------------- ";
+    AddStream(1);
+    AddStream(2);
+
+    LOG(LS_VERBOSE) << "Connect the transports -----------------------------";
+    // Both transports need to have started (with matching ports) for an
+    // association to be formed.
+    transport1_->Start(kTransport1Port, kTransport2Port);
+    transport2_->Start(kTransport2Port, kTransport1Port);
+  }
+
+  bool AddStream(int sid) {
+    bool ret = true;
+    ret = ret && transport1_->OpenStream(sid);
+    ret = ret && transport2_->OpenStream(sid);
+    return ret;
+  }
+
+  SctpTransport* CreateTransport(FakeTransportChannel* fake_dtls,
+                                 SctpFakeDataReceiver* recv) {
+    SctpTransport* transport =
+        new SctpTransport(rtc::Thread::Current(), fake_dtls);
+    // When data is received, pass it to the SctpFakeDataReceiver.
+    transport->SignalDataReceived.connect(
+        recv, &SctpFakeDataReceiver::OnDataReceived);
+    return transport;
+  }
+
+  bool SendData(SctpTransport* chan,
+                int sid,
+                const std::string& msg,
+                SendDataResult* result) {
+    SendDataParams params;
+    params.sid = sid;
+
+    return chan->SendData(params, rtc::CopyOnWriteBuffer(&msg[0], msg.length()),
+                          result);
+  }
+
+  bool ReceivedData(const SctpFakeDataReceiver* recv,
+                    int sid,
+                    const std::string& msg) {
+    return (recv->received() && recv->last_params().sid == sid &&
+            recv->last_data() == msg);
+  }
+
+  bool ProcessMessagesUntilIdle() {
+    rtc::Thread* thread = rtc::Thread::Current();
+    while (!thread->empty()) {
+      rtc::Message msg;
+      if (thread->Get(&msg, rtc::Thread::kForever)) {
+        thread->Dispatch(&msg);
+      }
+    }
+    return !thread->IsQuitting();
+  }
+
+  SctpTransport* transport1() { return transport1_.get(); }
+  SctpTransport* transport2() { return transport2_.get(); }
+  SctpFakeDataReceiver* receiver1() { return recv1_.get(); }
+  SctpFakeDataReceiver* receiver2() { return recv2_.get(); }
+  FakeTransportChannel* fake_dtls1() { return fake_dtls1_.get(); }
+  FakeTransportChannel* fake_dtls2() { return fake_dtls2_.get(); }
+
+  int transport1_ready_to_send_count() {
+    return transport1_ready_to_send_count_;
+  }
+  int transport2_ready_to_send_count() {
+    return transport2_ready_to_send_count_;
+  }
+
+ private:
+  std::unique_ptr<FakeTransportChannel> fake_dtls1_;
+  std::unique_ptr<FakeTransportChannel> fake_dtls2_;
+  std::unique_ptr<SctpFakeDataReceiver> recv1_;
+  std::unique_ptr<SctpFakeDataReceiver> recv2_;
+  std::unique_ptr<SctpTransport> transport1_;
+  std::unique_ptr<SctpTransport> transport2_;
+
+  int transport1_ready_to_send_count_ = 0;
+  int transport2_ready_to_send_count_ = 0;
+
+  void OnChan1ReadyToSend() { ++transport1_ready_to_send_count_; }
+  void OnChan2ReadyToSend() { ++transport2_ready_to_send_count_; }
+};
+
+// Test that data can be sent end-to-end when an SCTP transport starts with one
+// transport channel (which is unwritable), and then switches to another
+// channel. A common scenario due to how BUNDLE works.
+TEST_F(SctpTransportTest, SwitchTransportChannel) {
+  FakeTransportChannel black_hole("black hole", 0);
+  FakeTransportChannel fake_dtls1("fake dtls 1", 0);
+  FakeTransportChannel fake_dtls2("fake dtls 2", 0);
+  SctpFakeDataReceiver recv1;
+  SctpFakeDataReceiver recv2;
+
+  // Construct transport1 with the "black hole" channel.
+  std::unique_ptr<SctpTransport> transport1(
+      CreateTransport(&black_hole, &recv1));
+  std::unique_ptr<SctpTransport> transport2(
+      CreateTransport(&fake_dtls2, &recv2));
+
+  // Add a stream.
+  transport1->OpenStream(1);
+  transport2->OpenStream(1);
+
+  // Tell them both to start (though transport1_ is connected to black_hole).
+  transport1->Start(kTransport1Port, kTransport2Port);
+  transport2->Start(kTransport2Port, kTransport1Port);
+
+  // Switch transport1_ to the normal fake_dtls1_ channel.
+  transport1->SetTransportChannel(&fake_dtls1);
+
+  // Connect the two fake DTLS channels.
+  bool asymmetric = false;
+  fake_dtls1.SetDestination(&fake_dtls2, asymmetric);
+
+  // Make sure we end up able to send data.
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1.get(), 1, "foo", &result));
+  ASSERT_TRUE(SendData(transport2.get(), 1, "bar", &result));
+  EXPECT_TRUE_WAIT(ReceivedData(&recv2, 1, "foo"), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(ReceivedData(&recv1, 1, "bar"), kDefaultTimeout);
+}
+
+// Calling Start twice shouldn't do anything bad, if with the same parameters.
+TEST_F(SctpTransportTest, DuplicateStartCallsIgnored) {
+  SetupConnectedTransportsWithTwoStreams();
+  EXPECT_TRUE(transport1()->Start(kTransport1Port, kTransport2Port));
+
+  // Make sure we can still send/recv data.
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1(), 1, "foo", &result));
+  ASSERT_TRUE(SendData(transport2(), 1, "bar", &result));
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "foo"), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver1(), 1, "bar"), kDefaultTimeout);
+}
+
+// Calling Start a second time with a different port should fail.
+TEST_F(SctpTransportTest, CallingStartWithDifferentPortFails) {
+  SetupConnectedTransportsWithTwoStreams();
+  EXPECT_FALSE(transport1()->Start(kTransport1Port, 1234));
+  EXPECT_FALSE(transport1()->Start(1234, kTransport2Port));
+}
+
+// A value of -1 for the local/remote port should be treated as the default
+// (5000).
+TEST_F(SctpTransportTest, NegativeOnePortTreatedAsDefault) {
+  FakeTransportChannel fake_dtls1("fake dtls 1", 0);
+  FakeTransportChannel fake_dtls2("fake dtls 2", 0);
+  SctpFakeDataReceiver recv1;
+  SctpFakeDataReceiver recv2;
+  std::unique_ptr<SctpTransport> transport1(
+      CreateTransport(&fake_dtls1, &recv1));
+  std::unique_ptr<SctpTransport> transport2(
+      CreateTransport(&fake_dtls2, &recv2));
+
+  // Add a stream.
+  transport1->OpenStream(1);
+  transport2->OpenStream(1);
+
+  // Tell them both to start, giving one transport the default port and the
+  // other transport -1.
+  transport1->Start(kSctpDefaultPort, kSctpDefaultPort);
+  transport2->Start(-1, -1);
+
+  // Connect the two fake DTLS channels.
+  bool asymmetric = false;
+  fake_dtls1.SetDestination(&fake_dtls2, asymmetric);
+
+  // Make sure we end up able to send data.
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1.get(), 1, "foo", &result));
+  ASSERT_TRUE(SendData(transport2.get(), 1, "bar", &result));
+  EXPECT_TRUE_WAIT(ReceivedData(&recv2, 1, "foo"), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(ReceivedData(&recv1, 1, "bar"), kDefaultTimeout);
+}
+
+TEST_F(SctpTransportTest, OpenStreamWithAlreadyOpenedStreamFails) {
+  FakeTransportChannel fake_dtls("fake dtls", 0);
+  SctpFakeDataReceiver recv;
+  std::unique_ptr<SctpTransport> transport(CreateTransport(&fake_dtls, &recv));
+  EXPECT_TRUE(transport->OpenStream(1));
+  EXPECT_FALSE(transport->OpenStream(1));
+}
+
+TEST_F(SctpTransportTest, ResetStreamWithAlreadyResetStreamFails) {
+  FakeTransportChannel fake_dtls("fake dtls", 0);
+  SctpFakeDataReceiver recv;
+  std::unique_ptr<SctpTransport> transport(CreateTransport(&fake_dtls, &recv));
+  EXPECT_TRUE(transport->OpenStream(1));
+  EXPECT_TRUE(transport->ResetStream(1));
+  EXPECT_FALSE(transport->ResetStream(1));
+}
+
+// Test that SignalReadyToSendData is fired after Start has been called and the
+// DTLS channel is writable.
+TEST_F(SctpTransportTest, SignalReadyToSendDataAfterDtlsWritable) {
+  FakeTransportChannel fake_dtls("fake dtls", 0);
+  SctpFakeDataReceiver recv;
+  std::unique_ptr<SctpTransport> transport(CreateTransport(&fake_dtls, &recv));
+
+  SignalReadyToSendObserver signal_observer;
+  transport->SignalReadyToSendData.connect(
+      &signal_observer, &SignalReadyToSendObserver::OnSignaled);
+
+  transport->Start(kSctpDefaultPort, kSctpDefaultPort);
+  fake_dtls.SetWritable(true);
+  EXPECT_TRUE_WAIT(signal_observer.IsSignaled(), kDefaultTimeout);
+}
+
+// Test that after an SCTP socket's buffer is filled, SignalReadyToSendData
+// is fired after it begins to be drained.
+TEST_F(SctpTransportTest, SignalReadyToSendDataAfterBlocked) {
+  SetupConnectedTransportsWithTwoStreams();
+  // Wait for initial SCTP association to be formed.
+  EXPECT_EQ_WAIT(1, transport1_ready_to_send_count(), kDefaultTimeout);
+  // Make the fake transport unwritable so that messages pile up for the SCTP
+  // socket.
+  fake_dtls1()->SetWritable(false);
+  // Send messages until we get EWOULDBLOCK.
+  static const int kMaxMessages = 1024;
+  SendDataParams params;
+  params.sid = 1;
+  rtc::CopyOnWriteBuffer buf(1024);
+  memset(buf.data<uint8_t>(), 0, 1024);
+  SendDataResult result;
+  int message_count;
+  for (message_count = 0; message_count < kMaxMessages; ++message_count) {
+    if (!transport1()->SendData(params, buf, &result) && result == SDR_BLOCK) {
+      break;
+    }
+  }
+  ASSERT_NE(kMaxMessages, message_count)
+      << "Sent max number of messages without getting SDR_BLOCK?";
+  // Make sure the ready-to-send count hasn't changed.
+  EXPECT_EQ(1, transport1_ready_to_send_count());
+  // Make the transport writable again and expect a "SignalReadyToSendData" at
+  // some point.
+  fake_dtls1()->SetWritable(true);
+  EXPECT_EQ_WAIT(2, transport1_ready_to_send_count(), kDefaultTimeout);
+}
+
+TEST_F(SctpTransportTest, SendData) {
+  SetupConnectedTransportsWithTwoStreams();
+
+  SendDataResult result;
+  LOG(LS_VERBOSE)
+      << "transport1 sending: 'hello?' -----------------------------";
+  ASSERT_TRUE(SendData(transport1(), 1, "hello?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), kDefaultTimeout);
+  LOG(LS_VERBOSE) << "recv2.received=" << receiver2()->received()
+                  << ", recv2.last_params.sid="
+                  << receiver2()->last_params().sid
+                  << ", recv2.last_params.timestamp="
+                  << receiver2()->last_params().timestamp
+                  << ", recv2.last_params.seq_num="
+                  << receiver2()->last_params().seq_num
+                  << ", recv2.last_data=" << receiver2()->last_data();
+
+  LOG(LS_VERBOSE)
+      << "transport2 sending: 'hi transport1' -----------------------------";
+  ASSERT_TRUE(SendData(transport2(), 2, "hi transport1", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver1(), 2, "hi transport1"),
+                   kDefaultTimeout);
+  LOG(LS_VERBOSE) << "recv1.received=" << receiver1()->received()
+                  << ", recv1.last_params.sid="
+                  << receiver1()->last_params().sid
+                  << ", recv1.last_params.timestamp="
+                  << receiver1()->last_params().timestamp
+                  << ", recv1.last_params.seq_num="
+                  << receiver1()->last_params().seq_num
+                  << ", recv1.last_data=" << receiver1()->last_data();
+}
+
+// Sends a lot of large messages at once and verifies SDR_BLOCK is returned.
+TEST_F(SctpTransportTest, SendDataBlocked) {
+  SetupConnectedTransportsWithTwoStreams();
+
+  SendDataResult result;
+  SendDataParams params;
+  params.sid = 1;
+
+  std::vector<char> buffer(1024 * 64, 0);
+
+  for (size_t i = 0; i < 100; ++i) {
+    transport1()->SendData(
+        params, rtc::CopyOnWriteBuffer(&buffer[0], buffer.size()), &result);
+    if (result == SDR_BLOCK)
+      break;
+  }
+
+  EXPECT_EQ(SDR_BLOCK, result);
+}
+
+// Trying to send data for a nonexistent stream should fail.
+TEST_F(SctpTransportTest, SendDataWithNonexistentStreamFails) {
+  SetupConnectedTransportsWithTwoStreams();
+  SendDataResult result;
+  EXPECT_FALSE(SendData(transport2(), 123, "some data", &result));
+  EXPECT_EQ(SDR_ERROR, result);
+}
+
+TEST_F(SctpTransportTest, ClosesRemoteStream) {
+  SetupConnectedTransportsWithTwoStreams();
+  SignalTransportClosedObserver transport1_sig_receiver,
+      transport2_sig_receiver;
+  transport1_sig_receiver.BindSelf(transport1());
+  transport2_sig_receiver.BindSelf(transport2());
+
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1(), 1, "hello?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), kDefaultTimeout);
+  ASSERT_TRUE(SendData(transport2(), 2, "hi transport1", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver1(), 2, "hi transport1"),
+                   kDefaultTimeout);
+
+  // Close transport 1.  Transport 2 should notify us.
+  transport1()->ResetStream(1);
+  EXPECT_TRUE_WAIT(transport2_sig_receiver.WasStreamClosed(1), kDefaultTimeout);
+}
+
+TEST_F(SctpTransportTest, ClosesTwoRemoteStreams) {
+  SetupConnectedTransportsWithTwoStreams();
+  AddStream(3);
+  SignalTransportClosedObserver transport1_sig_receiver,
+      transport2_sig_receiver;
+  transport1_sig_receiver.BindSelf(transport1());
+  transport2_sig_receiver.BindSelf(transport2());
+
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1(), 1, "hello?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), kDefaultTimeout);
+  ASSERT_TRUE(SendData(transport2(), 2, "hi transport1", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver1(), 2, "hi transport1"),
+                   kDefaultTimeout);
+
+  // Close two streams on one side.
+  transport2()->ResetStream(2);
+  transport2()->ResetStream(3);
+  EXPECT_TRUE_WAIT(transport1_sig_receiver.WasStreamClosed(2), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(transport1_sig_receiver.WasStreamClosed(3), kDefaultTimeout);
+}
+
+TEST_F(SctpTransportTest, ClosesStreamsOnBothSides) {
+  SetupConnectedTransportsWithTwoStreams();
+  AddStream(3);
+  AddStream(4);
+  SignalTransportClosedObserver transport1_sig_receiver,
+      transport2_sig_receiver;
+  transport1_sig_receiver.BindSelf(transport1());
+  transport2_sig_receiver.BindSelf(transport2());
+
+  SendDataResult result;
+  ASSERT_TRUE(SendData(transport1(), 1, "hello?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), kDefaultTimeout);
+  ASSERT_TRUE(SendData(transport2(), 2, "hi transport1", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver1(), 2, "hi transport1"),
+                   kDefaultTimeout);
+
+  // Close one stream on transport1(), while closing three streams on
+  // transport2().  They will conflict (only one side can close anything at a
+  // time, apparently).  Test the resolution of the conflict.
+  transport1()->ResetStream(1);
+
+  transport2()->ResetStream(2);
+  transport2()->ResetStream(3);
+  transport2()->ResetStream(4);
+  EXPECT_TRUE_WAIT(transport2_sig_receiver.WasStreamClosed(1), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(transport1_sig_receiver.WasStreamClosed(2), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(transport1_sig_receiver.WasStreamClosed(3), kDefaultTimeout);
+  EXPECT_TRUE_WAIT(transport1_sig_receiver.WasStreamClosed(4), kDefaultTimeout);
+}
+
+TEST_F(SctpTransportTest, RefusesHighNumberedTransports) {
+  SetupConnectedTransportsWithTwoStreams();
+  EXPECT_TRUE(AddStream(kMaxSctpSid));
+  EXPECT_FALSE(AddStream(kMaxSctpSid + 1));
+}
+
+// Flaky, see webrtc:4453.
+TEST_F(SctpTransportTest, DISABLED_ReusesAStream) {
+  // Shut down transport 1, then open it up again for reuse.
+  SetupConnectedTransportsWithTwoStreams();
+  SendDataResult result;
+  SignalTransportClosedObserver transport2_sig_receiver;
+  transport2_sig_receiver.BindSelf(transport2());
+
+  ASSERT_TRUE(SendData(transport1(), 1, "hello?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), kDefaultTimeout);
+
+  transport1()->ResetStream(1);
+  EXPECT_TRUE_WAIT(transport2_sig_receiver.WasStreamClosed(1), kDefaultTimeout);
+  // Transport 1 is gone now.
+
+  // Create a new transport 1.
+  AddStream(1);
+  ASSERT_TRUE(SendData(transport1(), 1, "hi?", &result));
+  EXPECT_EQ(SDR_SUCCESS, result);
+  EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hi?"), kDefaultTimeout);
+  transport1()->ResetStream(1);
+  EXPECT_TRUE_WAIT(transport2_sig_receiver.StreamCloseCount(1) == 2,
+                   kDefaultTimeout);
+}
+
+}  // namespace cricket