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// Copyright 2020 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/fuchsia_legacymetrics/legacymetrics_histogram_flattener.h"
#include <string_view>
#include "base/metrics/histogram_macros.h"
#include "testing/gtest/include/gtest/gtest.h"
using fuchsia::legacymetrics::Histogram;
using fuchsia::legacymetrics::HistogramBucket;
namespace fuchsia_legacymetrics {
namespace {
constexpr char kHistogramCount1M[] = "Foo.Bar";
int64_t GetCount(int64_t value, const std::vector<HistogramBucket>& buckets) {
for (const HistogramBucket& bucket : buckets) {
if (value >= bucket.min && value < bucket.max)
return bucket.count;
}
return 0;
}
const fuchsia::legacymetrics::Histogram* LookupHistogram(
std::string_view name,
const std::vector<Histogram>& histograms) {
for (const auto& histogram : histograms) {
if (histogram.name() == name)
return &histogram;
}
return nullptr;
}
class LegacyMetricsHistogramFlattenerTest : public testing::Test {
public:
LegacyMetricsHistogramFlattenerTest() = default;
~LegacyMetricsHistogramFlattenerTest() override = default;
void SetUp() override {
// Flush all histogram deltas from prior tests executed in this process.
GetLegacyMetricsDeltas();
}
};
TEST_F(LegacyMetricsHistogramFlattenerTest, NoHistogramData) {
EXPECT_TRUE(GetLegacyMetricsDeltas().empty());
}
TEST_F(LegacyMetricsHistogramFlattenerTest, Boolean) {
constexpr char kBooleanHistogram[] = "Foo.Bar.Boolean";
UMA_HISTOGRAM_BOOLEAN(kBooleanHistogram, true);
UMA_HISTOGRAM_BOOLEAN(kBooleanHistogram, true);
UMA_HISTOGRAM_BOOLEAN(kBooleanHistogram, false);
auto deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(1,
GetCount(0, LookupHistogram(kBooleanHistogram, deltas)->buckets()));
EXPECT_EQ(2,
GetCount(1, LookupHistogram(kBooleanHistogram, deltas)->buckets()));
}
TEST_F(LegacyMetricsHistogramFlattenerTest, Linear) {
constexpr char kLinearHistogram[] = "Foo.Bar.Linear";
for (int i = 0; i < 200; ++i) {
UMA_HISTOGRAM_EXACT_LINEAR(kLinearHistogram, i, 200);
}
auto deltas = GetLegacyMetricsDeltas();
for (int i = 0; i < 200; ++i) {
EXPECT_EQ(
1, GetCount(i, LookupHistogram(kLinearHistogram, deltas)->buckets()));
}
}
TEST_F(LegacyMetricsHistogramFlattenerTest, Percentage) {
constexpr char kPercentageHistogram[] = "Foo.Bar.Percentage";
for (int i = 0; i <= 100; ++i) {
for (int j = 0; j < i; ++j)
UMA_HISTOGRAM_PERCENTAGE(kPercentageHistogram, i);
}
auto deltas = GetLegacyMetricsDeltas();
for (int i = 0; i <= 100; ++i) {
EXPECT_EQ(
i,
GetCount(i, LookupHistogram(kPercentageHistogram, deltas)->buckets()));
}
}
enum Fruit {
APPLE,
BANANA,
PEAR,
FRUIT_MAX = PEAR,
};
TEST_F(LegacyMetricsHistogramFlattenerTest, Enumeration) {
constexpr char kEnumHistogram[] = "Foo.Bar.Enumeration";
UMA_HISTOGRAM_ENUMERATION(kEnumHistogram, APPLE, FRUIT_MAX);
UMA_HISTOGRAM_ENUMERATION(kEnumHistogram, BANANA, FRUIT_MAX);
UMA_HISTOGRAM_ENUMERATION(kEnumHistogram, BANANA, FRUIT_MAX);
UMA_HISTOGRAM_ENUMERATION(kEnumHistogram, BANANA, FRUIT_MAX);
UMA_HISTOGRAM_ENUMERATION(kEnumHistogram, PEAR, FRUIT_MAX);
auto deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(
1, GetCount(APPLE, LookupHistogram(kEnumHistogram, deltas)->buckets()));
EXPECT_EQ(
3, GetCount(BANANA, LookupHistogram(kEnumHistogram, deltas)->buckets()));
EXPECT_EQ(1,
GetCount(PEAR, LookupHistogram(kEnumHistogram, deltas)->buckets()));
}
TEST_F(LegacyMetricsHistogramFlattenerTest, NoNewData) {
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 20);
auto deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(
1, GetCount(20, LookupHistogram(kHistogramCount1M, deltas)->buckets()));
// No changes to a histogram means we should not be seeing it in the deltas.
deltas = GetLegacyMetricsDeltas();
EXPECT_TRUE(deltas.empty());
}
TEST_F(LegacyMetricsHistogramFlattenerTest, MultipleHistograms) {
constexpr char kAnotherHistogram[] = "Foo.Bar2";
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 20);
UMA_HISTOGRAM_COUNTS_1M(kAnotherHistogram, 1000);
UMA_HISTOGRAM_COUNTS_1M(kAnotherHistogram, 1000);
auto deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(
1, GetCount(20, LookupHistogram(kHistogramCount1M, deltas)->buckets()));
EXPECT_EQ(
2, GetCount(1000, LookupHistogram(kAnotherHistogram, deltas)->buckets()));
}
TEST_F(LegacyMetricsHistogramFlattenerTest, MultipleBuckets) {
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 20);
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 1000);
auto deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(
1, GetCount(20, LookupHistogram(kHistogramCount1M, deltas)->buckets()));
EXPECT_EQ(
1, GetCount(1000, LookupHistogram(kHistogramCount1M, deltas)->buckets()));
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 1000);
UMA_HISTOGRAM_COUNTS_1M(kHistogramCount1M, 1000);
deltas = GetLegacyMetricsDeltas();
EXPECT_EQ(
2, GetCount(1000, LookupHistogram(kHistogramCount1M, deltas)->buckets()));
}
} // namespace
} // namespace fuchsia_legacymetrics
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