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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/congestion_control/leaky_bucket.h"
#include "net/quic/test_tools/mock_clock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace test {
class LeakyBucketTest : public ::testing::Test {
protected:
virtual void SetUp() {
leaky_bucket_.reset(new LeakyBucket(&clock_, QuicBandwidth::Zero()));
}
MockClock clock_;
scoped_ptr<LeakyBucket> leaky_bucket_;
};
TEST_F(LeakyBucketTest, Basic) {
QuicBandwidth draining_rate = QuicBandwidth::FromBytesPerSecond(200000);
leaky_bucket_->SetDrainingRate(draining_rate);
leaky_bucket_->Add(2000);
EXPECT_EQ(2000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
leaky_bucket_->TimeRemaining());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
EXPECT_EQ(1000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(5),
leaky_bucket_->TimeRemaining());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
EXPECT_EQ(0u, leaky_bucket_->BytesPending());
EXPECT_TRUE(leaky_bucket_->TimeRemaining().IsZero());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
EXPECT_EQ(0u, leaky_bucket_->BytesPending());
EXPECT_TRUE(leaky_bucket_->TimeRemaining().IsZero());
leaky_bucket_->Add(2000);
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(11));
EXPECT_EQ(0u, leaky_bucket_->BytesPending());
EXPECT_TRUE(leaky_bucket_->TimeRemaining().IsZero());
leaky_bucket_->Add(2000);
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
leaky_bucket_->Add(2000);
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
EXPECT_EQ(2000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
leaky_bucket_->TimeRemaining());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(10));
EXPECT_EQ(0u, leaky_bucket_->BytesPending());
EXPECT_TRUE(leaky_bucket_->TimeRemaining().IsZero());
}
TEST_F(LeakyBucketTest, ChangeDrainRate) {
QuicBandwidth draining_rate = QuicBandwidth::FromBytesPerSecond(200000);
leaky_bucket_->SetDrainingRate(draining_rate);
leaky_bucket_->Add(2000);
EXPECT_EQ(2000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
leaky_bucket_->TimeRemaining());
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5));
EXPECT_EQ(1000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(5),
leaky_bucket_->TimeRemaining());
draining_rate = draining_rate.Scale(0.5f); // Cut drain rate in half.
leaky_bucket_->SetDrainingRate(draining_rate);
EXPECT_EQ(1000u, leaky_bucket_->BytesPending());
EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10),
leaky_bucket_->TimeRemaining());
}
} // namespace test
} // namespace net
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