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85 lines
2.3 KiB
85 lines
2.3 KiB
4 months ago
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// Copyright (c) 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/histogram_samples.h"
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#include <limits>
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#include "base/test/gtest_util.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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using SingleSample = HistogramSamples::SingleSample;
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using AtomicSingleSample = HistogramSamples::AtomicSingleSample;
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TEST(SingleSampleTest, Load) {
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AtomicSingleSample sample;
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ASSERT_TRUE(sample.Accumulate(9, 1));
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SingleSample s = sample.Load();
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EXPECT_EQ(9U, s.bucket);
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EXPECT_EQ(1U, s.count);
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s = sample.Load();
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EXPECT_EQ(9U, s.bucket);
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EXPECT_EQ(1U, s.count);
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}
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TEST(SingleSampleTest, Extract) {
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AtomicSingleSample sample;
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ASSERT_TRUE(sample.Accumulate(9, 1));
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SingleSample s = sample.Extract(/*disable=*/false);
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EXPECT_EQ(9U, s.bucket);
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EXPECT_EQ(1U, s.count);
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s = sample.Extract(/*disable=*/false);
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EXPECT_EQ(0U, s.bucket);
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EXPECT_EQ(0U, s.count);
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}
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TEST(SingleSampleTest, Disable) {
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AtomicSingleSample sample;
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EXPECT_EQ(0U, sample.Extract(/*disable=*/false).count);
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EXPECT_FALSE(sample.IsDisabled());
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ASSERT_TRUE(sample.Accumulate(9, 1));
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EXPECT_EQ(1U, sample.Extract(/*disable=*/true).count);
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EXPECT_TRUE(sample.IsDisabled());
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ASSERT_FALSE(sample.Accumulate(9, 1));
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EXPECT_EQ(0U, sample.Extract(/*disable=*/false).count);
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EXPECT_FALSE(sample.IsDisabled());
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}
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TEST(SingleSampleTest, Accumulate) {
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AtomicSingleSample sample;
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ASSERT_TRUE(sample.Accumulate(9, 1));
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ASSERT_TRUE(sample.Accumulate(9, 2));
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ASSERT_TRUE(sample.Accumulate(9, 4));
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EXPECT_EQ(7U, sample.Extract(/*disable=*/false).count);
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ASSERT_TRUE(sample.Accumulate(9, 4));
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ASSERT_TRUE(sample.Accumulate(9, -2));
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ASSERT_TRUE(sample.Accumulate(9, 1));
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EXPECT_EQ(3U, sample.Extract(/*disable=*/false).count);
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}
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TEST(SingleSampleTest, Overflow) {
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AtomicSingleSample sample;
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ASSERT_TRUE(sample.Accumulate(9, 1));
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ASSERT_FALSE(sample.Accumulate(9, -2));
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EXPECT_EQ(1U, sample.Extract(/*disable=*/false).count);
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ASSERT_TRUE(sample.Accumulate(9, std::numeric_limits<uint16_t>::max()));
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ASSERT_FALSE(sample.Accumulate(9, 1));
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EXPECT_EQ(std::numeric_limits<uint16_t>::max(),
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sample.Extract(/*disable=*/false).count);
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}
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} // namespace base
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