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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/time/time.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
enum UmaHistogramTestingEnum {
UMA_HISTOGRAM_TESTING_ENUM_FIRST,
UMA_HISTOGRAM_TESTING_ENUM_SECOND,
UMA_HISTOGRAM_TESTING_ENUM_THIRD
};
TEST(HistogramFunctionsTest, ExactLinear) {
std::string histogram("Testing.UMA.HistogramExactLinear");
HistogramTester tester;
UmaHistogramExactLinear(histogram, 10, 100);
tester.ExpectUniqueSample(histogram, 10, 1);
UmaHistogramExactLinear(histogram, 20, 100);
UmaHistogramExactLinear(histogram, 10, 100);
tester.ExpectBucketCount(histogram, 10, 2);
tester.ExpectBucketCount(histogram, 20, 1);
tester.ExpectTotalCount(histogram, 3);
// Test linear buckets overflow.
UmaHistogramExactLinear(histogram, 200, 100);
tester.ExpectBucketCount(histogram, 101, 1);
tester.ExpectTotalCount(histogram, 4);
// Test linear buckets underflow.
UmaHistogramExactLinear(histogram, 0, 100);
tester.ExpectBucketCount(histogram, 0, 1);
tester.ExpectTotalCount(histogram, 5);
}
TEST(HistogramFunctionsTest, Enumeration) {
std::string histogram("Testing.UMA.HistogramEnumeration");
HistogramTester tester;
UmaHistogramEnumeration(histogram, UMA_HISTOGRAM_TESTING_ENUM_FIRST,
UMA_HISTOGRAM_TESTING_ENUM_THIRD);
tester.ExpectUniqueSample(histogram, UMA_HISTOGRAM_TESTING_ENUM_FIRST, 1);
// Verify the overflow & underflow bucket exists.
UMA_HISTOGRAM_ENUMERATION(
histogram, static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD) + 10,
static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD));
tester.ExpectBucketCount(
histogram, static_cast<int>(UMA_HISTOGRAM_TESTING_ENUM_THIRD) + 1, 1);
tester.ExpectTotalCount(histogram, 2);
}
TEST(HistogramFunctionsTest, Boolean) {
std::string histogram("Testing.UMA.HistogramBoolean");
HistogramTester tester;
UmaHistogramBoolean(histogram, true);
tester.ExpectUniqueSample(histogram, 1, 1);
UmaHistogramBoolean(histogram, false);
tester.ExpectBucketCount(histogram, 0, 1);
tester.ExpectTotalCount(histogram, 2);
}
TEST(HistogramFunctionsTest, Percentage) {
std::string histogram("Testing.UMA.HistogramPercentage");
HistogramTester tester;
UmaHistogramPercentage(histogram, 1);
tester.ExpectBucketCount(histogram, 1, 1);
tester.ExpectTotalCount(histogram, 1);
UmaHistogramPercentage(histogram, 50);
tester.ExpectBucketCount(histogram, 50, 1);
tester.ExpectTotalCount(histogram, 2);
UmaHistogramPercentage(histogram, 100);
tester.ExpectBucketCount(histogram, 100, 1);
tester.ExpectTotalCount(histogram, 3);
// Test overflows.
UmaHistogramPercentage(histogram, 101);
tester.ExpectBucketCount(histogram, 101, 1);
tester.ExpectTotalCount(histogram, 4);
UmaHistogramPercentage(histogram, 500);
tester.ExpectBucketCount(histogram, 101, 2);
tester.ExpectTotalCount(histogram, 5);
}
TEST(HistogramFunctionsTest, Counts) {
std::string histogram("Testing.UMA.HistogramCount.Custom");
HistogramTester tester;
// Add a sample that should go into the underflow bucket.
UmaHistogramCustomCounts(histogram, 0, 1, 100, 10);
// Add a sample that should go into the first bucket.
UmaHistogramCustomCounts(histogram, 1, 1, 100, 10);
// Add multiple samples that should go into the same bucket.
UmaHistogramCustomCounts(histogram, 20, 1, 100, 10);
UmaHistogramCustomCounts(histogram, 20, 1, 100, 10);
UmaHistogramCustomCounts(histogram, 21, 1, 100, 10);
// Add a sample that should go into the last bucket.
UmaHistogramCustomCounts(histogram, 99, 1, 100, 10);
// Add some samples that should go into the overflow bucket.
UmaHistogramCustomCounts(histogram, 100, 1, 100, 10);
UmaHistogramCustomCounts(histogram, 101, 1, 100, 10);
// Verify the number of samples.
tester.ExpectTotalCount(histogram, 8);
// Verify the following:
// (a) The underflow bucket [0, 1) contains one sample.
// (b) The first and last buckets each contain one sample.
// (c) The bucket for values in [16, 29) contains three samples.
// (d) The overflow bucket contains two samples.
EXPECT_THAT(tester.GetAllSamples(histogram),
testing::ElementsAre(Bucket(0, 1), Bucket(1, 1), Bucket(16, 3),
Bucket(54, 1), Bucket(100, 2)));
}
TEST(HistogramFunctionsTest, Times) {
std::string histogram("Testing.UMA.HistogramTimes");
HistogramTester tester;
UmaHistogramTimes(histogram, Seconds(1));
tester.ExpectTimeBucketCount(histogram, Seconds(1), 1);
tester.ExpectTotalCount(histogram, 1);
UmaHistogramTimes(histogram, Seconds(9));
tester.ExpectTimeBucketCount(histogram, Seconds(9), 1);
tester.ExpectTotalCount(histogram, 2);
UmaHistogramTimes(histogram, Seconds(10)); // Overflows
tester.ExpectTimeBucketCount(histogram, Seconds(10), 1);
UmaHistogramTimes(histogram, Seconds(20)); // Overflows.
// Check the value by picking any overflow time.
tester.ExpectTimeBucketCount(histogram, Seconds(11), 2);
tester.ExpectTotalCount(histogram, 4);
}
TEST(HistogramFunctionsTest, ScopedTimes) {
std::string histogram("Testing.UMA.HistogramScopedTimes");
HistogramTester tester;
{ ScopedUmaHistogramTimer scoped_uma_histogram_timer(histogram); }
tester.ExpectTotalCount(histogram, 1);
{ ScopedUmaHistogramTimer scoped_uma_histogram_timer(histogram); }
tester.ExpectTotalCount(histogram, 2);
}
TEST(HistogramFunctionsTest, Sparse_SupportsLargeRange) {
std::string histogram("Testing.UMA.HistogramSparse");
HistogramTester tester;
UmaHistogramSparse(histogram, 0);
UmaHistogramSparse(histogram, 123456789);
UmaHistogramSparse(histogram, 123456789);
EXPECT_THAT(tester.GetAllSamples(histogram),
testing::ElementsAre(Bucket(0, 1), Bucket(123456789, 2)));
}
TEST(HistogramFunctionsTest, Sparse_SupportsNegativeValues) {
std::string histogram("Testing.UMA.HistogramSparse");
HistogramTester tester;
UmaHistogramSparse(histogram, -1);
tester.ExpectUniqueSample(histogram, -1, 1);
}
} // namespace base.
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