Add unit tests to ReceiveStatisticsProxy class.

webrtc/video/receive_statistics_proxy_unittest.cc

Index: webrtc/video/receive_statistics_proxy_unittest.cc
diff --git a/webrtc/video/receive_statistics_proxy_unittest.cc b/webrtc/video/receive_statistics_proxy_unittest.cc
index b8c4b20f99a304f0a42d612c3288d85ecea76c5a..66856a70ade72fff3c42b9a486f607e075b4c9fb 100644
--- a/webrtc/video/receive_statistics_proxy_unittest.cc
+++ b/webrtc/video/receive_statistics_proxy_unittest.cc
@@ -18,6 +18,9 @@
 namespace webrtc {
 namespace {
 const int64_t kFreqOffsetProcessIntervalInMs = 40000;
+const uint32_t kLocalSsrc = 123;
+const uint32_t kRemoteSsrc = 456;
+const int kMinRequiredSamples = 200;
 }  // namespace
 
 // TODO(sakal): ReceiveStatisticsProxy is lacking unittesting.
@@ -34,6 +37,8 @@ class ReceiveStatisticsProxyTest : public ::testing::Test {
 
   VideoReceiveStream::Config GetTestConfig() {
     VideoReceiveStream::Config config(nullptr);
+    config.rtp.local_ssrc = kLocalSsrc;
+    config.rtp.remote_ssrc = kRemoteSsrc;
     return config;
   }
 
@@ -50,6 +55,75 @@ TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameIncreasesFramesDecoded) {
   }
 }
 
+TEST_F(ReceiveStatisticsProxyTest, GetStatsReportsSsrc) {
+  EXPECT_EQ(kRemoteSsrc, statistics_proxy_->GetStats().ssrc);
+}
+
+TEST_F(ReceiveStatisticsProxyTest, GetStatsReportsIncomingPayloadType) {
+  const int kPayloadType = 111;
+  statistics_proxy_->OnIncomingPayloadType(kPayloadType);
+  EXPECT_EQ(kPayloadType, statistics_proxy_->GetStats().current_payload_type);
+}
+
+TEST_F(ReceiveStatisticsProxyTest, GetStatsReportsIncomingRate) {
+  const int kFramerate = 28;
+  const int kBitrateBps = 311000;
+  statistics_proxy_->OnIncomingRate(kFramerate, kBitrateBps);
+  EXPECT_EQ(kFramerate, statistics_proxy_->GetStats().network_frame_rate);
+  EXPECT_EQ(kBitrateBps, statistics_proxy_->GetStats().total_bitrate_bps);
+}
+
+TEST_F(ReceiveStatisticsProxyTest, GetStatsReportsDecodeTimingStats) {
+  const int kDecodeMs = 1;
+  const int kMaxDecodeMs = 2;
+  const int kCurrentDelayMs = 3;
+  const int kTargetDelayMs = 4;
+  const int kJitterBufferMs = 5;
+  const int kMinPlayoutDelayMs = 6;
+  const int kRenderDelayMs = 7;
+  const int64_t kRttMs = 8;
+  statistics_proxy_->OnDecoderTiming(
+      kDecodeMs, kMaxDecodeMs, kCurrentDelayMs, kTargetDelayMs, kJitterBufferMs,
+      kMinPlayoutDelayMs, kRenderDelayMs, kRttMs);
+  VideoReceiveStream::Stats stats = statistics_proxy_->GetStats();
+  EXPECT_EQ(kDecodeMs, stats.decode_ms);
+  EXPECT_EQ(kMaxDecodeMs, stats.max_decode_ms);
+  EXPECT_EQ(kCurrentDelayMs, stats.current_delay_ms);
+  EXPECT_EQ(kTargetDelayMs, stats.target_delay_ms);
+  EXPECT_EQ(kJitterBufferMs, stats.jitter_buffer_ms);
+  EXPECT_EQ(kMinPlayoutDelayMs, stats.min_playout_delay_ms);
+  EXPECT_EQ(kRenderDelayMs, stats.render_delay_ms);
+}
+
+TEST_F(ReceiveStatisticsProxyTest, GetStatsReportsDiscardedPackets) {
+  const int kDiscardedPackets = 12;
+  statistics_proxy_->OnDiscardedPacketsUpdated(kDiscardedPackets);
+  EXPECT_EQ(kDiscardedPackets, statistics_proxy_->GetStats().discarded_packets);
+}
+
+TEST_F(ReceiveStatisticsProxyTest, LifetimeHistogramIsUpdated) {
+  const int64_t kTimeSec = 3;
+  fake_clock_.AdvanceTimeMilliseconds(kTimeSec * 1000);
+  // Histograms are updated when the statistics_proxy_ is deleted.
+  statistics_proxy_.reset();
+  EXPECT_EQ(1,
+            metrics::NumSamples("WebRTC.Video.ReceiveStreamLifetimeInSeconds"));
+  EXPECT_EQ(1, metrics::NumEvents("WebRTC.Video.ReceiveStreamLifetimeInSeconds",
+                                  kTimeSec));
+}
+
+TEST_F(ReceiveStatisticsProxyTest, AvSyncOffsetHistogramIsUpdated) {
+  const int64_t kSyncOffsetMs = 22;
+  const double kFreqKhz = 90.0;
+  for (int i = 0; i < kMinRequiredSamples; ++i)
+    statistics_proxy_->OnSyncOffsetUpdated(kSyncOffsetMs, kFreqKhz);
+  // Histograms are updated when the statistics_proxy_ is deleted.
+  statistics_proxy_.reset();
+  EXPECT_EQ(1, metrics::NumSamples("WebRTC.Video.AVSyncOffsetInMs"));
+  EXPECT_EQ(1,
+            metrics::NumEvents("WebRTC.Video.AVSyncOffsetInMs", kSyncOffsetMs));
+}
+
 TEST_F(ReceiveStatisticsProxyTest, RtpToNtpFrequencyOffsetHistogramIsUpdated) {
   const int64_t kSyncOffsetMs = 22;
   const double kFreqKhz = 90.0;