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// Copyright 2014 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/test/histogram_tester.h"
#include <memory>
#include "base/metrics/histogram_macros.h"
#include "base/metrics/histogram_samples.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using ::testing::ElementsAre;
using ::testing::IsEmpty;
namespace {
const char kHistogram1[] = "Test1";
const char kHistogram2[] = "Test2";
const char kHistogram3[] = "Test3";
const char kHistogram4[] = "Test4";
const char kHistogram5[] = "Test5";
} // namespace
namespace base {
typedef testing::Test HistogramTesterTest;
TEST_F(HistogramTesterTest, Scope) {
// Record a histogram before the creation of the recorder.
UMA_HISTOGRAM_BOOLEAN(kHistogram1, true);
HistogramTester tester;
// Verify that no histogram is recorded.
tester.ExpectTotalCount(kHistogram1, 0);
// Record a histogram after the creation of the recorder.
UMA_HISTOGRAM_BOOLEAN(kHistogram1, true);
// Verify that one histogram is recorded.
std::unique_ptr<HistogramSamples> samples(
tester.GetHistogramSamplesSinceCreation(kHistogram1));
EXPECT_TRUE(samples);
EXPECT_EQ(1, samples->TotalCount());
}
TEST_F(HistogramTesterTest, GetHistogramSamplesSinceCreationNotNull) {
// Chose the histogram name uniquely, to ensure nothing was recorded for it so
// far.
static const char kHistogram[] =
"GetHistogramSamplesSinceCreationNotNullHistogram";
HistogramTester tester;
// Verify that the returned samples are empty but not null.
std::unique_ptr<HistogramSamples> samples(
tester.GetHistogramSamplesSinceCreation(kHistogram1));
EXPECT_TRUE(samples);
tester.ExpectTotalCount(kHistogram, 0);
}
TEST_F(HistogramTesterTest, TestUniqueSample) {
HistogramTester tester;
// Record into a sample thrice
UMA_HISTOGRAM_COUNTS_100(kHistogram2, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram2, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram2, 2);
tester.ExpectUniqueSample(kHistogram2, 2, 3);
}
TEST_F(HistogramTesterTest, TestBucketsSample) {
HistogramTester tester;
// Record into a sample twice
UMA_HISTOGRAM_COUNTS_100(kHistogram3, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram3, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram3, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram3, 2);
UMA_HISTOGRAM_COUNTS_100(kHistogram3, 3);
tester.ExpectBucketCount(kHistogram3, 2, 4);
tester.ExpectBucketCount(kHistogram3, 3, 1);
tester.ExpectTotalCount(kHistogram3, 5);
}
TEST_F(HistogramTesterTest, TestBucketsSampleWithScope) {
// Record into a sample twice, once before the tester creation and once after.
UMA_HISTOGRAM_COUNTS_100(kHistogram4, 2);
HistogramTester tester;
UMA_HISTOGRAM_COUNTS_100(kHistogram4, 3);
tester.ExpectBucketCount(kHistogram4, 2, 0);
tester.ExpectBucketCount(kHistogram4, 3, 1);
tester.ExpectTotalCount(kHistogram4, 1);
}
TEST_F(HistogramTesterTest, TestGetAllSamples) {
HistogramTester tester;
UMA_HISTOGRAM_ENUMERATION(kHistogram5, 2, 5);
UMA_HISTOGRAM_ENUMERATION(kHistogram5, 3, 5);
UMA_HISTOGRAM_ENUMERATION(kHistogram5, 3, 5);
UMA_HISTOGRAM_ENUMERATION(kHistogram5, 5, 5);
EXPECT_THAT(tester.GetAllSamples(kHistogram5),
ElementsAre(Bucket(2, 1), Bucket(3, 2), Bucket(5, 1)));
}
TEST_F(HistogramTesterTest, TestGetAllSamples_NoSamples) {
HistogramTester tester;
EXPECT_THAT(tester.GetAllSamples(kHistogram5), IsEmpty());
}
TEST_F(HistogramTesterTest, TestGetTotalCountsForPrefix) {
HistogramTester tester;
UMA_HISTOGRAM_ENUMERATION("Test1.Test2.Test3", 2, 5);
// Regression check for bug https://crbug.com/659977.
EXPECT_TRUE(tester.GetTotalCountsForPrefix("Test2.").empty());
EXPECT_EQ(1u, tester.GetTotalCountsForPrefix("Test1.").size());
}
} // namespace base
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