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// Copyright (c) 2017 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/metrics/histogram_samples.h"
#include <limits>
#include "base/test/gtest_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
using SingleSample = HistogramSamples::SingleSample;
using AtomicSingleSample = HistogramSamples::AtomicSingleSample;
TEST(SingleSampleTest, Load) {
AtomicSingleSample sample;
ASSERT_TRUE(sample.Accumulate(9, 1));
SingleSample s = sample.Load();
EXPECT_EQ(9U, s.bucket);
EXPECT_EQ(1U, s.count);
s = sample.Load();
EXPECT_EQ(9U, s.bucket);
EXPECT_EQ(1U, s.count);
}
TEST(SingleSampleTest, Extract) {
AtomicSingleSample sample;
ASSERT_TRUE(sample.Accumulate(9, 1));
SingleSample s = sample.Extract(/*disable=*/false);
EXPECT_EQ(9U, s.bucket);
EXPECT_EQ(1U, s.count);
s = sample.Extract(/*disable=*/false);
EXPECT_EQ(0U, s.bucket);
EXPECT_EQ(0U, s.count);
}
TEST(SingleSampleTest, Disable) {
AtomicSingleSample sample;
EXPECT_EQ(0U, sample.Extract(/*disable=*/false).count);
EXPECT_FALSE(sample.IsDisabled());
ASSERT_TRUE(sample.Accumulate(9, 1));
EXPECT_EQ(1U, sample.Extract(/*disable=*/true).count);
EXPECT_TRUE(sample.IsDisabled());
ASSERT_FALSE(sample.Accumulate(9, 1));
EXPECT_EQ(0U, sample.Extract(/*disable=*/false).count);
EXPECT_FALSE(sample.IsDisabled());
}
TEST(SingleSampleTest, Accumulate) {
AtomicSingleSample sample;
ASSERT_TRUE(sample.Accumulate(9, 1));
ASSERT_TRUE(sample.Accumulate(9, 2));
ASSERT_TRUE(sample.Accumulate(9, 4));
EXPECT_EQ(7U, sample.Extract(/*disable=*/false).count);
ASSERT_TRUE(sample.Accumulate(9, 4));
ASSERT_TRUE(sample.Accumulate(9, -2));
ASSERT_TRUE(sample.Accumulate(9, 1));
EXPECT_EQ(3U, sample.Extract(/*disable=*/false).count);
}
TEST(SingleSampleTest, Overflow) {
AtomicSingleSample sample;
ASSERT_TRUE(sample.Accumulate(9, 1));
ASSERT_FALSE(sample.Accumulate(9, -2));
EXPECT_EQ(1U, sample.Extract(/*disable=*/false).count);
ASSERT_TRUE(sample.Accumulate(9, std::numeric_limits<uint16_t>::max()));
ASSERT_FALSE(sample.Accumulate(9, 1));
EXPECT_EQ(std::numeric_limits<uint16_t>::max(),
sample.Extract(/*disable=*/false).count);
}
} // namespace base
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