SampleSet -> HistogramSamples (will be reused by SparseHistogram)

base/metrics/sample_vector_unittest.cc

+// 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), "");
+}
+
+// (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
+#endif
+
+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());
+}
+
+// (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
+#endif
+
+}  // namespace
+}  // namespace base