content/browser/download/rate_estimator_unittest.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/download/rate_estimator.h"
   6
   7 #include "testing/gtest/include/gtest/gtest.h"
   8
   9 using base::TimeDelta;
  10
  11 namespace content {
  12
  13 TEST(RateEstimatorTest, RateEstimator) {
  14   base::TimeTicks now;
  15   RateEstimator estimator(TimeDelta::FromSeconds(1), 10u, now);
  16   EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
  17
  18   estimator.Increment(50u, now);
  19   EXPECT_EQ(50u, estimator.GetCountPerSecond(now));
  20
  21   now += TimeDelta::FromMilliseconds(800);
  22   estimator.Increment(50, now);
  23   EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
  24
  25   // Advance time.
  26   now += TimeDelta::FromSeconds(3);
  27   EXPECT_EQ(25u, estimator.GetCountPerSecond(now));
  28   estimator.Increment(60, now);
  29   EXPECT_EQ(40u, estimator.GetCountPerSecond(now));
  30
  31   // Advance time again.
  32   now += TimeDelta::FromSeconds(4);
  33   EXPECT_EQ(20u, estimator.GetCountPerSecond(now));
  34
  35   // Advance time to the end.
  36   now += TimeDelta::FromSeconds(2);
  37   EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
  38   estimator.Increment(100, now);
  39   EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
  40
  41   // Now wrap around to the start.
  42   now += TimeDelta::FromSeconds(1);
  43   EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
  44   estimator.Increment(100, now);
  45   EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
  46
  47   // Advance far into the future.
  48   now += TimeDelta::FromSeconds(40);
  49   EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
  50   estimator.Increment(100, now);
  51   EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
  52
  53   // Pretend that there is timeticks wrap around.
  54   now = base::TimeTicks();
  55   EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
  56 }
  57
  58 }  // namespace content