Remove rtcp_utility as mostly unused.

webrtc/modules/rtp_rtcp/source/rtcp_nack_stats_unittest.cc

+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#include "webrtc/modules/rtp_rtcp/source/rtcp_nack_stats.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+TEST(RtcpNackStatsTest, Requests) {
+  RtcpNackStats stats;
+  EXPECT_EQ(0U, stats.unique_requests());
+  EXPECT_EQ(0U, stats.requests());
+  stats.ReportRequest(10);
+  EXPECT_EQ(1U, stats.unique_requests());
+  EXPECT_EQ(1U, stats.requests());
+
+  stats.ReportRequest(10);
+  EXPECT_EQ(1U, stats.unique_requests());
+  stats.ReportRequest(11);
+  EXPECT_EQ(2U, stats.unique_requests());
+
+  stats.ReportRequest(11);
+  EXPECT_EQ(2U, stats.unique_requests());
+  stats.ReportRequest(13);
+  EXPECT_EQ(3U, stats.unique_requests());
+
+  stats.ReportRequest(11);
+  EXPECT_EQ(3U, stats.unique_requests());
+  EXPECT_EQ(6U, stats.requests());
+}
+
+TEST(RtcpNackStatsTest, RequestsWithWrap) {
+  RtcpNackStats stats;
+  stats.ReportRequest(65534);
+  EXPECT_EQ(1U, stats.unique_requests());
+
+  stats.ReportRequest(65534);
+  EXPECT_EQ(1U, stats.unique_requests());
+  stats.ReportRequest(65535);
+  EXPECT_EQ(2U, stats.unique_requests());
+
+  stats.ReportRequest(65535);
+  EXPECT_EQ(2U, stats.unique_requests());
+  stats.ReportRequest(0);
+  EXPECT_EQ(3U, stats.unique_requests());
+
+  stats.ReportRequest(65535);
+  EXPECT_EQ(3U, stats.unique_requests());
+  stats.ReportRequest(0);
+  EXPECT_EQ(3U, stats.unique_requests());
+  stats.ReportRequest(1);
+  EXPECT_EQ(4U, stats.unique_requests());
+  EXPECT_EQ(8U, stats.requests());
+}
+
+}  // namespace webrtc
+