blob: 1c20fd05a2732c7e14e61713fbe3da6d645f5bd5 [file] [log] [blame]
/*
* Copyright 2010 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/base/gunit.h"
#include "webrtc/base/ratetracker.h"
namespace rtc {
class RateTrackerForTest : public RateTracker {
public:
RateTrackerForTest() : time_(0) {}
virtual uint32 Time() const { return time_; }
void AdvanceTime(uint32 delta) { time_ += delta; }
private:
uint32 time_;
};
TEST(RateTrackerTest, TestBasics) {
RateTrackerForTest tracker;
EXPECT_EQ(0U, tracker.total_units());
EXPECT_EQ(0U, tracker.units_second());
// Add a sample.
tracker.Update(1234);
// Advance the clock by 100 ms.
tracker.AdvanceTime(100);
// total_units should advance, but units_second should stay 0.
EXPECT_EQ(1234U, tracker.total_units());
EXPECT_EQ(0U, tracker.units_second());
// Repeat.
tracker.Update(1234);
tracker.AdvanceTime(100);
EXPECT_EQ(1234U * 2, tracker.total_units());
EXPECT_EQ(0U, tracker.units_second());
// Advance the clock by 800 ms, so we've elapsed a full second.
// units_second should now be filled in properly.
tracker.AdvanceTime(800);
EXPECT_EQ(1234U * 2, tracker.total_units());
EXPECT_EQ(1234U * 2, tracker.units_second());
// Poll the tracker again immediately. The reported rate should stay the same.
EXPECT_EQ(1234U * 2, tracker.total_units());
EXPECT_EQ(1234U * 2, tracker.units_second());
// Do nothing and advance by a second. We should drop down to zero.
tracker.AdvanceTime(1000);
EXPECT_EQ(1234U * 2, tracker.total_units());
EXPECT_EQ(0U, tracker.units_second());
// Send a bunch of data at a constant rate for 5.5 "seconds".
// We should report the rate properly.
for (int i = 0; i < 5500; i += 100) {
tracker.Update(9876U);
tracker.AdvanceTime(100);
}
EXPECT_EQ(9876U * 10, tracker.units_second());
// Advance the clock by 500 ms. Since we sent nothing over this half-second,
// the reported rate should be reduced by half.
tracker.AdvanceTime(500);
EXPECT_EQ(9876U * 5, tracker.units_second());
}
TEST(RateTrackerTest, TestGetUnitSecondsAfterInitialValue) {
RateTrackerForTest tracker;
tracker.Update(1234);
tracker.AdvanceTime(1000);
EXPECT_EQ(1234u, tracker.units_second());
}
} // namespace rtc