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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/download/public/common/rate_estimator.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace download {
TEST(RateEstimatorTest, RateEstimator) {
base::TimeTicks now;
RateEstimator estimator(base::Seconds(1), 10u, now);
EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
estimator.Increment(50u, now);
EXPECT_EQ(50u, estimator.GetCountPerSecond(now));
now += base::Milliseconds(800);
estimator.Increment(50, now);
EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
// Advance time.
now += base::Seconds(3);
EXPECT_EQ(25u, estimator.GetCountPerSecond(now));
estimator.Increment(60, now);
EXPECT_EQ(40u, estimator.GetCountPerSecond(now));
// Advance time again.
now += base::Seconds(4);
EXPECT_EQ(20u, estimator.GetCountPerSecond(now));
// Advance time to the end.
now += base::Seconds(2);
EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
estimator.Increment(100, now);
EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
// Now wrap around to the start.
now += base::Seconds(1);
EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
estimator.Increment(100, now);
EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
// Advance far into the future.
now += base::Seconds(40);
EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
estimator.Increment(100, now);
EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
// Pretend that there is timeticks wrap around.
now = base::TimeTicks();
EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
}
} // namespace download
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