Add flakiness check if there is no received packets in a certain period.

webrtc/p2p/base/p2ptransportchannel_unittest.cc

 /*
  *  Copyright 2009 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.
  */
 
@@ skipping 1843 matching lines @@
   ASSERT_TRUE(conn1 != nullptr);
   EXPECT_EQ(conn1->remote_candidate().priority(), remote_priority);
 
   // conn3, a real prflx connection, should have prflx priority.
   port->SignalUnknownAddress(port, rtc::SocketAddress("3.3.3.3", 1),
                              cricket::PROTO_UDP, &request, kIceUfrag[1], false);
   cricket::Connection* conn3 = WaitForConnectionTo(&ch, "3.3.3.3", 1);
   ASSERT_TRUE(conn3 != nullptr);
   EXPECT_EQ(conn3->remote_candidate().priority(), prflx_priority);
 }
+
+TEST_F(P2PTransportChannelPingTest, TestReceivingStateChange) {
+  cricket::FakePortAllocator pa(rtc::Thread::Current(), nullptr);
+  cricket::P2PTransportChannel ch("receiving state change", 1, nullptr, &pa);
+  PrepareChannel(&ch);
+  // Default receiving timeout and checking receiving delay should not be too
+  // small.
+  EXPECT_LE(1000, ch.receiving_timeout());
+  EXPECT_LE(200, ch.check_receiving_delay());
+  ch.set_receiving_timeout(500);
+  EXPECT_EQ(500, ch.receiving_timeout());
+  EXPECT_EQ(50, ch.check_receiving_delay());
+  ch.Connect();
+  ch.OnCandidate(CreateCandidate("1.1.1.1", 1, 1));
+  cricket::Connection* conn1 = WaitForConnectionTo(&ch, "1.1.1.1", 1);
+  ASSERT_TRUE(conn1 != nullptr);
+
+  conn1->ReceivedPing();
+  conn1->OnReadPacket("ABC", 3, rtc::CreatePacketTime(0));
+  EXPECT_TRUE_WAIT(ch.best_connection() != nullptr, 1000)
+  EXPECT_TRUE_WAIT(ch.receiving(), 1000);
+  EXPECT_TRUE_WAIT(!ch.receiving(), 1000);
+}