Let a minimum time interval pass (one bucket size) after initialization before reporting rates (to …

webrtc/base/ratetracker_unittest.cc

Index: webrtc/base/ratetracker_unittest.cc
diff --git a/webrtc/base/ratetracker_unittest.cc b/webrtc/base/ratetracker_unittest.cc
index 2187282cd3fd406b6118abe2c9a5bd09bda82cee..75fec55818826fbc45a113ea529bedf6a30d7f82 100644
--- a/webrtc/base/ratetracker_unittest.cc
+++ b/webrtc/base/ratetracker_unittest.cc
@@ -12,10 +12,13 @@
 #include "webrtc/base/ratetracker.h"
 
 namespace rtc {
+namespace {
+  const uint32_t kBucketIntervalMs = 100;
+}  // namespace
 
 class RateTrackerForTest : public RateTracker {
  public:
-  RateTrackerForTest() : RateTracker(100u, 10u), time_(0) {}
+  RateTrackerForTest() : RateTracker(kBucketIntervalMs, 10u), time_(0) {}
   virtual uint32_t Time() const { return time_; }
   void AdvanceTime(uint32_t delta) { time_ += delta; }
 
@@ -55,8 +58,11 @@ TEST(RateTrackerTest, TestRateTrackerBasics) {
 
   // Add a sample.
   tracker.AddSamples(1234);
-  // Advance the clock by 100 ms.
-  tracker.AdvanceTime(100);
+  // Advance the clock by less than one bucket interval (no rate returned).
+  tracker.AdvanceTime(kBucketIntervalMs - 1);
+  EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRate());
+  // Advance the clock by 100 ms (one bucket interval).
+  tracker.AdvanceTime(1);
   EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRateForInterval(1000u));
   EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRate());
   EXPECT_EQ(1234U, tracker.TotalSampleCount());