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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 "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "base/metrics/histogram_samples.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
const std::string kHistogram1 = "Test1";
const std::string kHistogram2 = "Test2";
const std::string kHistogram3 = "Test3";
const std::string kHistogram4 = "Test4";
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.
scoped_ptr<HistogramSamples> samples(
tester.GetHistogramSamplesSinceCreation(kHistogram1));
EXPECT_FALSE(samples);
// Record a histogram after the creation of the recorder.
UMA_HISTOGRAM_BOOLEAN(kHistogram1, true);
// Verify that one histogram is recorded.
samples = tester.GetHistogramSamplesSinceCreation(kHistogram1);
EXPECT_TRUE(samples);
EXPECT_EQ(1, samples->TotalCount());
}
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);
}
} // namespace base
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