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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 <vector>
#include "base/memory/scoped_ptr.h"
#include "base/metrics/bucket_ranges.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sample_vector.h"
#include "testing/gtest/include/gtest/gtest.h"
using std::vector;
namespace base {
namespace {
TEST(SampleVectorTest, AccumulateTest) {
// Custom buckets: [1, 5) [5, 10)
BucketRanges ranges(3);
ranges.set_range(0, 1);
ranges.set_range(1, 5);
ranges.set_range(2, 10);
SampleVector samples(&ranges);
samples.Accumulate(1, 200);
samples.Accumulate(2, -300);
EXPECT_EQ(-100, samples.GetCountAtIndex(0));
samples.Accumulate(5, 200);
EXPECT_EQ(200, samples.GetCountAtIndex(1));
EXPECT_EQ(600, samples.sum());
EXPECT_EQ(100, samples.redundant_count());
EXPECT_EQ(samples.TotalCount(), samples.redundant_count());
samples.Accumulate(5, -100);
EXPECT_EQ(100, samples.GetCountAtIndex(1));
EXPECT_EQ(100, samples.sum());
EXPECT_EQ(0, samples.redundant_count());
EXPECT_EQ(samples.TotalCount(), samples.redundant_count());
}
TEST(SampleVectorTest, AddSubtractTest) {
// Custom buckets: [0, 1) [1, 2) [2, 3) [3, INT_MAX)
BucketRanges ranges(5);
ranges.set_range(0, 0);
ranges.set_range(1, 1);
ranges.set_range(2, 2);
ranges.set_range(3, 3);
ranges.set_range(4, INT_MAX);
SampleVector samples1(&ranges);
samples1.Accumulate(0, 100);
samples1.Accumulate(2, 100);
samples1.Accumulate(4, 100);
EXPECT_EQ(600, samples1.sum());
EXPECT_EQ(300, samples1.TotalCount());
EXPECT_EQ(samples1.redundant_count(), samples1.TotalCount());
SampleVector samples2(&ranges);
samples2.Accumulate(1, 200);
samples2.Accumulate(2, 200);
samples2.Accumulate(4, 200);
EXPECT_EQ(1400, samples2.sum());
EXPECT_EQ(600, samples2.TotalCount());
EXPECT_EQ(samples2.redundant_count(), samples2.TotalCount());
samples1.Add(samples2);
EXPECT_EQ(100, samples1.GetCountAtIndex(0));
EXPECT_EQ(200, samples1.GetCountAtIndex(1));
EXPECT_EQ(300, samples1.GetCountAtIndex(2));
EXPECT_EQ(300, samples1.GetCountAtIndex(3));
EXPECT_EQ(2000, samples1.sum());
EXPECT_EQ(900, samples1.TotalCount());
EXPECT_EQ(samples1.redundant_count(), samples1.TotalCount());
samples1.Subtract(samples2);
EXPECT_EQ(100, samples1.GetCountAtIndex(0));
EXPECT_EQ(0, samples1.GetCountAtIndex(1));
EXPECT_EQ(100, samples1.GetCountAtIndex(2));
EXPECT_EQ(100, samples1.GetCountAtIndex(3));
EXPECT_EQ(600, samples1.sum());
EXPECT_EQ(300, samples1.TotalCount());
EXPECT_EQ(samples1.redundant_count(), samples1.TotalCount());
}
#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
TEST(SampleVectorDeathTest, BucketIndexTest) {
// 8 buckets with exponential layout:
// [0, 1) [1, 2) [2, 4) [4, 8) [8, 16) [16, 32) [32, 64) [64, INT_MAX)
BucketRanges ranges(9);
Histogram::InitializeBucketRanges(1, 64, 8, &ranges);
SampleVector samples(&ranges);
// Normal case
samples.Accumulate(0, 1);
samples.Accumulate(3, 2);
samples.Accumulate(64, 3);
EXPECT_EQ(1, samples.GetCount(0));
EXPECT_EQ(2, samples.GetCount(2));
EXPECT_EQ(3, samples.GetCount(65));
// Extreme case.
EXPECT_DEATH(samples.Accumulate(INT_MIN, 100), "");
EXPECT_DEATH(samples.Accumulate(-1, 100), "");
EXPECT_DEATH(samples.Accumulate(INT_MAX, 100), "");
// Custom buckets: [1, 5) [5, 10)
// Note, this is not a valid BucketRanges for Histogram because it does not
// have overflow buckets.
BucketRanges ranges2(3);
ranges2.set_range(0, 1);
ranges2.set_range(1, 5);
ranges2.set_range(2, 10);
SampleVector samples2(&ranges2);
// Normal case.
samples2.Accumulate(1, 1);
samples2.Accumulate(4, 1);
samples2.Accumulate(5, 2);
samples2.Accumulate(9, 2);
EXPECT_EQ(2, samples2.GetCount(1));
EXPECT_EQ(4, samples2.GetCount(5));
// Extreme case.
EXPECT_DEATH(samples2.Accumulate(0, 100), "");
EXPECT_DEATH(samples2.Accumulate(10, 100), "");
}
TEST(SampleVectorDeathTest, AddSubtractBucketNotMatchTest) {
// Custom buckets 1: [1, 3) [3, 5)
BucketRanges ranges1(3);
ranges1.set_range(0, 1);
ranges1.set_range(1, 3);
ranges1.set_range(2, 5);
SampleVector samples1(&ranges1);
// Custom buckets 2: [0, 1) [1, 3) [3, 6) [6, 7)
BucketRanges ranges2(5);
ranges2.set_range(0, 0);
ranges2.set_range(1, 1);
ranges2.set_range(2, 3);
ranges2.set_range(3, 6);
ranges2.set_range(4, 7);
SampleVector samples2(&ranges2);
samples2.Accumulate(1, 100);
samples1.Add(samples2);
EXPECT_EQ(100, samples1.GetCountAtIndex(0));
// Extra bucket in the beginning.
samples2.Accumulate(0, 100);
EXPECT_DEATH(samples1.Add(samples2), "");
EXPECT_DEATH(samples1.Subtract(samples2), "");
// Extra bucket in the end.
samples2.Accumulate(0, -100);
samples2.Accumulate(6, 100);
EXPECT_DEATH(samples1.Add(samples2), "");
EXPECT_DEATH(samples1.Subtract(samples2), "");
// Bucket not match: [3, 5) VS [3, 6)
samples2.Accumulate(6, -100);
samples2.Accumulate(3, 100);
EXPECT_DEATH(samples1.Add(samples2), "");
EXPECT_DEATH(samples1.Subtract(samples2), "");
}
#endif
// (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
TEST(SampleVectorIteratorTest, IterateTest) {
BucketRanges ranges(5);
ranges.set_range(0, 0);
ranges.set_range(1, 1);
ranges.set_range(2, 2);
ranges.set_range(3, 3);
ranges.set_range(4, 4);
vector<HistogramBase::Count> counts(3);
counts[0] = 1;
counts[1] = 0; // Iterator will bypass this empty bucket.
counts[2] = 2;
// BucketRanges can have larger size than counts.
SampleVectorIterator it(&counts, &ranges);
size_t index;
HistogramBase::Sample min;
HistogramBase::Sample max;
HistogramBase::Count count;
it.Get(&min, &max, &count);
EXPECT_EQ(0, min);
EXPECT_EQ(1, max);
EXPECT_EQ(1, count);
EXPECT_TRUE(it.GetBucketIndex(&index));
EXPECT_EQ(0u, index);
it.Next();
it.Get(&min, &max, &count);
EXPECT_EQ(2, min);
EXPECT_EQ(3, max);
EXPECT_EQ(2, count);
EXPECT_TRUE(it.GetBucketIndex(&index));
EXPECT_EQ(2u, index);
it.Next();
EXPECT_TRUE(it.Done());
// Create iterator from SampleVector.
SampleVector samples(&ranges);
samples.Accumulate(0, 0);
samples.Accumulate(1, 1);
samples.Accumulate(2, 2);
samples.Accumulate(3, 3);
scoped_ptr<SampleCountIterator> it2 = samples.Iterator();
int i;
for (i = 1; !it2->Done(); i++, it2->Next()) {
it2->Get(&min, &max, &count);
EXPECT_EQ(i, min);
EXPECT_EQ(i + 1, max);
EXPECT_EQ(i, count);
size_t index;
EXPECT_TRUE(it2->GetBucketIndex(&index));
EXPECT_EQ(static_cast<size_t>(i), index);
}
EXPECT_EQ(4, i);
}
#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
TEST(SampleVectorIteratorDeathTest, IterateDoneTest) {
BucketRanges ranges(5);
ranges.set_range(0, 0);
ranges.set_range(1, 1);
ranges.set_range(2, 2);
ranges.set_range(3, 3);
ranges.set_range(4, INT_MAX);
SampleVector samples(&ranges);
scoped_ptr<SampleCountIterator> it = samples.Iterator();
EXPECT_TRUE(it->Done());
HistogramBase::Sample min;
HistogramBase::Sample max;
HistogramBase::Count count;
EXPECT_DEATH(it->Get(&min, &max, &count), "");
EXPECT_DEATH(it->Next(), "");
samples.Accumulate(2, 100);
it = samples.Iterator();
EXPECT_FALSE(it->Done());
}
#endif
// (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
} // namespace
} // namespace base