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

webrtc/p2p/base/transport_unittest.cc

 /*
  *  Copyright 2011 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 303 matching lines @@
   cricket::TransportStats stats;
   EXPECT_TRUE(transport_->GetStats(&stats));
   // Note that this tests the behavior of a FakeTransportChannel.
   ASSERT_EQ(1U, stats.channel_stats.size());
   EXPECT_EQ(1, stats.channel_stats[0].component);
   transport_->ConnectChannels();
   EXPECT_TRUE(transport_->GetStats(&stats));
   ASSERT_EQ(1U, stats.channel_stats.size());
   EXPECT_EQ(1, stats.channel_stats[0].component);
 }
+
+TEST_F(TransportTest, TestReceivingStateChange) {
+  ASSERT_TRUE(SetupChannel());
+  channel_->SetConnectionCount(1);
+  transport_->ConnectChannels();
+  EXPECT_FALSE(transport_->any_channel_receiving());
+
+  channel_->SetReceiving(true);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+  FakeTransportChannel* channel2 = CreateChannel(2);
+  channel2->SetReceiving(true);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+
+  channel2->SetReceiving(false);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+
+  // After both channels become not receiving, the transport receiving state
+  // becomes TRANSPORT_STATE_NONE.
+  channel_->SetReceiving(false);
+  EXPECT_TRUE_WAIT(!transport_->any_channel_receiving(), 100);
+}