Fix the logic for computing the number of truncated QUIC ACK frames sent.

net/quic/quic_connection_logger_unittest.cc

+// Copyright 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_connection_logger.h"
+
+#include "net/quic/quic_protocol.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace test {
+
+class QuicConnectionLoggerPeer {
+ public:
+  static size_t num_truncated_acks_sent(const QuicConnectionLogger& logger) {
+    return logger.num_truncated_acks_sent_;
+  }
+};
+
+class QuicConnectionLoggerTest : public ::testing::Test {
+ protected:
+  QuicConnectionLoggerTest() : logger_(net_log_) {}
+
+  BoundNetLog net_log_;
+  QuicConnectionLogger logger_;
+};
+
+TEST_F(QuicConnectionLoggerTest, TruncatedAcksSentNotChanged) {
+  QuicAckFrame frame;
+  logger_.OnFrameAddedToPacket(QuicFrame(&frame));
+  EXPECT_EQ(0u, QuicConnectionLoggerPeer::num_truncated_acks_sent(logger_));
+
+  for (QuicPacketSequenceNumber i = 0; i < 256; ++i) {
+    frame.missing_packets.insert(i);
+  }
+  logger_.OnFrameAddedToPacket(QuicFrame(&frame));
+  EXPECT_EQ(0u, QuicConnectionLoggerPeer::num_truncated_acks_sent(logger_));
+}
+
+TEST_F(QuicConnectionLoggerTest, TruncatedAcksSent) {
+  QuicAckFrame frame;
+  for (QuicPacketSequenceNumber i = 0; i < 512; i += 2) {
+    frame.missing_packets.insert(i);
+  }
+  logger_.OnFrameAddedToPacket(QuicFrame(&frame));
+  EXPECT_EQ(1u, QuicConnectionLoggerPeer::num_truncated_acks_sent(logger_));
+}
+
+}  // namespace test
+}  // namespace net