Close the connection after 3RTOs if there are no open streams and the 3RTO

net/quic/core/quic_connection_test.cc

Index: net/quic/core/quic_connection_test.cc
diff --git a/net/quic/core/quic_connection_test.cc b/net/quic/core/quic_connection_test.cc
index f6df716f18223318588c385de54a5cb0bffff2af..3075a0a5b7cba2a267d973f9040efd0fee426ee1 100644
--- a/net/quic/core/quic_connection_test.cc
+++ b/net/quic/core/quic_connection_test.cc
@@ -3617,6 +3617,40 @@ TEST_P(QuicConnectionTest, TimeoutAfter5ClientRTOs) {
   EXPECT_FALSE(connection_.connected());
 }
 
+TEST_P(QuicConnectionTest, TimeoutAfter3ClientRTOs) {
+  FLAGS_quic_reloadable_flag_quic_enable_3rtos = true;
+  connection_.SetMaxTailLossProbes(2);
+  EXPECT_TRUE(connection_.connected());
+  EXPECT_CALL(*send_algorithm_, SetFromConfig(_, _));
+  QuicConfig config;
+  QuicTagVector connection_options;
+  connection_options.push_back(k3RTO);
+  config.SetConnectionOptionsToSend(connection_options);
+  connection_.SetFromConfig(config);
+
+  // Send stream data.
+  SendStreamDataToPeer(kClientDataStreamId1, "foo", 0, FIN, nullptr);
+
+  EXPECT_CALL(visitor_, OnPathDegrading());
+  // Fire the retransmission alarm 4 times, twice for TLP and 2 times for RTO.
+  for (int i = 0; i < 4; ++i) {
+    EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _));
+    connection_.GetRetransmissionAlarm()->Fire();
+    EXPECT_TRUE(connection_.GetTimeoutAlarm()->IsSet());
+    EXPECT_TRUE(connection_.connected());
+  }
+
+  EXPECT_EQ(2u, connection_.sent_packet_manager().GetConsecutiveTlpCount());
+  EXPECT_EQ(2u, connection_.sent_packet_manager().GetConsecutiveRtoCount());
+  // This time, we should time out.
+  EXPECT_CALL(visitor_, OnConnectionClosed(QUIC_TOO_MANY_RTOS, _,
+                                           ConnectionCloseSource::FROM_SELF));
+  EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _));
+  connection_.GetRetransmissionAlarm()->Fire();
+  EXPECT_FALSE(connection_.GetTimeoutAlarm()->IsSet());
+  EXPECT_FALSE(connection_.connected());
+}
+
 TEST_P(QuicConnectionTest, SendScheduler) {
   // Test that if we send a packet without delay, it is not queued.
   QuicPacket* packet = ConstructDataPacket(1, !kHasStopWaiting);