Close connection when packet generator is trying to add a frame which

net/quic/core/quic_packet_generator_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_packet_generator.h"
 
 #include <cstdint>
 #include <memory>
 #include <string>
 
@@ skipping 859 matching lines @@
 
   // Try to switch path after current open packet gets serialized.
   EXPECT_CALL(delegate_, OnSerializedPacket(_))
       .WillOnce(Invoke(this, &QuicPacketGeneratorTest::SavePacket));
   generator_.FlushAllQueuedFrames();
   EXPECT_FALSE(generator_.HasQueuedFrames());
   generator_.SetCurrentPath(kTestPathId1, 1, 0);
   EXPECT_EQ(kTestPathId1, QuicPacketCreatorPeer::GetCurrentPath(creator_));
 }
 
+// Regression test for b/31486443.
+TEST_F(QuicPacketGeneratorTest, ConnectionCloseFrameLargerThanPacketSize) {
+  FLAGS_quic_close_connection_on_huge_frames = true;
+  delegate_.SetCanWriteAnything();
+  QuicConnectionCloseFrame* frame = new QuicConnectionCloseFrame();
+  frame->error_code = QUIC_PACKET_WRITE_ERROR;
+  char buf[2000];
+  StringPiece error_details(buf, 2000);
+  frame->error_details = error_details.as_string();
+  EXPECT_CALL(delegate_,
+              OnUnrecoverableError(QUIC_FAILED_TO_SERIALIZE_PACKET,
+                                   "Single frame cannot fit into a packet", _));
+  EXPECT_QUIC_BUG(generator_.AddControlFrame(QuicFrame(frame)), "");
+  EXPECT_TRUE(generator_.HasQueuedFrames());
+}
+
 }  // namespace test
 }  // namespace net