Land Recent QUIC Changes.

net/quic/quic_flow_controller_test.cc

+// Copyright (c) 2014 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/quic_flow_controller.h"
+
+#include "base/strings/stringprintf.h"
+#include "net/quic/quic_flags.h"
+#include "net/quic/quic_utils.h"
+#include "net/quic/test_tools/quic_flow_controller_peer.h"
+#include "net/quic/test_tools/quic_test_utils.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+using base::StringPrintf;
+
+namespace net {
+namespace test {
+
+TEST(QuicFlowControllerTest, SendingBytes) {
+  ValueRestore<bool> old_flag(&FLAGS_enable_quic_stream_flow_control, true);
+
+  const QuicStreamId kStreamId = 1234;
+  const uint64 kSendWindow = 100;
+  const uint64 kReceiveWindow = 200;
+  const uint64 kMaxReceiveWindow = 200;
+
+  QuicFlowController fc(kStreamId, false, kSendWindow, kReceiveWindow,
+                        kMaxReceiveWindow);
+
+  EXPECT_TRUE(fc.IsEnabled());
+  EXPECT_FALSE(fc.IsBlocked());
+  EXPECT_FALSE(fc.FlowControlViolation());
+  EXPECT_EQ(kSendWindow, fc.SendWindowSize());
+
+  // Send some bytes, but not enough to block.
+  fc.AddBytesSent(kSendWindow / 2);
+  EXPECT_FALSE(fc.IsBlocked());
+  EXPECT_EQ(kSendWindow / 2, fc.SendWindowSize());
+
+  // Send enough bytes to block.
+  fc.AddBytesSent(kSendWindow / 2);
+  EXPECT_TRUE(fc.IsBlocked());
+  EXPECT_EQ(0u, fc.SendWindowSize());
+
+  // BLOCKED frame should get sent.
+  MockConnection connection(false);
+  EXPECT_CALL(connection, SendBlocked(kStreamId)).Times(1);
+  fc.MaybeSendBlocked(&connection);
+
+  // Update the send window, and verify this has unblocked.
+  EXPECT_TRUE(fc.UpdateSendWindowOffset(2 * kSendWindow));
+  EXPECT_FALSE(fc.IsBlocked());
+  EXPECT_EQ(kSendWindow, fc.SendWindowSize());
+
+  // Updating with a smaller offset doesn't change anything.
+  EXPECT_FALSE(fc.UpdateSendWindowOffset(kSendWindow / 10));
+  EXPECT_EQ(kSendWindow, fc.SendWindowSize());
+
+  // Try to send more bytes, violating flow control.
+  EXPECT_DFATAL(fc.AddBytesSent(kSendWindow * 10),
+                StringPrintf("Trying to send an extra %d bytes",
+                             static_cast<int>(kSendWindow * 10)));
+  EXPECT_TRUE(fc.IsBlocked());
+  EXPECT_EQ(0u, fc.SendWindowSize());
+}
+
+TEST(QuicFlowControllerTest, ReceivingBytes) {
+  ValueRestore<bool> old_flag(&FLAGS_enable_quic_stream_flow_control, true);
+
+  const QuicStreamId kStreamId = 1234;
+  const uint64 kSendWindow = 100;
+  const uint64 kReceiveWindow = 200;
+  const uint64 kMaxReceiveWindow = 200;
+
+  QuicFlowController fc(kStreamId, false, kSendWindow, kReceiveWindow,
+                        kMaxReceiveWindow);
+
+  EXPECT_TRUE(fc.IsEnabled());
+  EXPECT_FALSE(fc.IsBlocked());
+  EXPECT_FALSE(fc.FlowControlViolation());
+
+  // Buffer some bytes, not enough to fill window.
+  fc.AddBytesBuffered(kReceiveWindow / 2);
+  EXPECT_FALSE(fc.FlowControlViolation());
+  EXPECT_EQ(kReceiveWindow / 2, QuicFlowControllerPeer::ReceiveWindowSize(&fc));
+
+  // Consume enough bytes to send a WINDOW_UPDATE frame.
+  fc.RemoveBytesBuffered(kReceiveWindow / 2);
+  fc.AddBytesConsumed(1 + kReceiveWindow / 2);
+  EXPECT_FALSE(fc.FlowControlViolation());
+  EXPECT_EQ((kReceiveWindow / 2) - 1,
+            QuicFlowControllerPeer::ReceiveWindowSize(&fc));
+
+  MockConnection connection(false);
+  EXPECT_CALL(connection, SendWindowUpdate(kStreamId, ::testing::_)).Times(1);
+  fc.MaybeSendWindowUpdate(&connection);
+}
+
+}  // namespace test
+}  // namespace net