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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/metrics/histograms_monitor.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/statistics_recorder.h"
#include "content/public/test/browser_task_environment.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace {
constexpr std::string kEmptyFilter = "";
} // namespace
class HistogramsMonitorTest : public testing::Test {
public:
HistogramsMonitorTest()
: task_environment_(BrowserTaskEnvironment::IO_MAINLOOP) {}
content::BrowserTaskEnvironment task_environment_;
};
TEST_F(HistogramsMonitorTest, StartMonitoringThenGetDiff) {
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram1");
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram2");
base::HistogramBase* histogram1 = base::Histogram::FactoryGet(
"MonitorHistogram1", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram1->Add(30);
HistogramsMonitor monitor;
monitor.StartMonitoring();
// Get diff immediately should return nothing.
base::Value::List diff = monitor.GetDiff(kEmptyFilter);
ASSERT_EQ(diff.size(), 0ull);
// Add more data to histogram.
histogram1->Add(30);
histogram1->Add(40);
diff = monitor.GetDiff(kEmptyFilter);
ASSERT_EQ(diff.size(), 1ull);
std::string* header1 = diff[0].GetDict().FindString("header");
EXPECT_EQ(*header1,
"Histogram: MonitorHistogram1 recorded 2 samples, mean = 35.0");
// Add another histogram
base::HistogramBase* histogram2 = base::Histogram::FactoryGet(
"MonitorHistogram2", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram2->Add(50);
diff = monitor.GetDiff(kEmptyFilter);
ASSERT_EQ(diff.size(), 2ull);
std::string* header2 = diff[1].GetDict().FindString("header");
EXPECT_EQ(*header2,
"Histogram: MonitorHistogram2 recorded 1 samples, mean = 50.0");
}
TEST_F(HistogramsMonitorTest, StartMonitoringWithQueryThenGetDiff) {
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram1");
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram2");
base::HistogramBase* histogram1 = base::Histogram::FactoryGet(
"MonitorHistogram1", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram1->Add(30);
HistogramsMonitor monitor;
monitor.StartMonitoring();
base::HistogramBase* histogram2 = base::Histogram::FactoryGet(
"MonitorHistogram2", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram2->Add(50);
base::Value::List diff = monitor.GetDiff("MonitorHistogram1");
ASSERT_EQ(diff.size(), 0ull);
}
TEST_F(HistogramsMonitorTest, CaseInsensitiveQuery) {
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram1");
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram2");
base::HistogramBase* histogram1 = base::Histogram::FactoryGet(
"MonitorHistogram1", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram1->Add(30);
HistogramsMonitor monitor;
monitor.StartMonitoring();
base::HistogramBase* histogram2 = base::Histogram::FactoryGet(
"MonitorHistogram2", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram2->Add(50);
// The query shouldn't match "MonitorHistogram2".
base::Value::List diff = monitor.GetDiff("histogram1");
ASSERT_EQ(diff.size(), 0ull);
histogram1->Add(10);
// The query should match "MonitorHistogram1", since it's case insensitive.
diff = monitor.GetDiff("histogram1");
ASSERT_EQ(diff.size(), 1ull);
std::string* header2 = diff[0].GetDict().FindString("header");
EXPECT_EQ(*header2,
"Histogram: MonitorHistogram1 recorded 1 samples, mean = 10.0");
}
TEST_F(HistogramsMonitorTest, MonitoringBaselineDoesntChangeWithFilter) {
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram1");
base::StatisticsRecorder::ForgetHistogramForTesting("MonitorHistogram2");
base::HistogramBase* histogram1 = base::Histogram::FactoryGet(
"MonitorHistogram1", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram1->Add(30);
base::HistogramBase* histogram2 = base::Histogram::FactoryGet(
"MonitorHistogram2", 1, 1000, 10, base::HistogramBase::kNoFlags);
histogram2->Add(50);
HistogramsMonitor monitor;
monitor.StartMonitoring();
// Get diff immediately should return nothing.
base::Value::List diff = monitor.GetDiff(kEmptyFilter);
ASSERT_EQ(diff.size(), 0ull);
// Add more data to histogram.
histogram1->Add(30);
histogram1->Add(40);
histogram2->Add(20);
// Filter the query to only return "MonitorHistogram1", the baseline should
// not change.
diff = monitor.GetDiff("MonitorHistogram1");
ASSERT_EQ(diff.size(), 1ull);
std::string* header1 = diff[0].GetDict().FindString("header");
EXPECT_EQ(*header1,
"Histogram: MonitorHistogram1 recorded 2 samples, mean = 35.0");
// Add more data to histogram2 and expect both samples after baseline to be
// returned.
histogram2->Add(10);
diff = monitor.GetDiff("MonitorHistogram2");
ASSERT_EQ(diff.size(), 1ull);
std::string* header2 = diff[0].GetDict().FindString("header");
EXPECT_EQ(*header2,
"Histogram: MonitorHistogram2 recorded 2 samples, mean = 15.0");
// Add more data to histogram1 and expect that both histograms are still
// returned for empty filter as they changed compared to the baseline.
histogram1->Add(50);
diff = monitor.GetDiff(kEmptyFilter);
ASSERT_EQ(diff.size(), 2ull);
std::vector<std::string> headers;
headers.push_back(*diff[0].GetDict().FindString("header"));
headers.push_back(*diff[1].GetDict().FindString("header"));
EXPECT_THAT(headers,
testing::UnorderedElementsAre(
"Histogram: MonitorHistogram1 recorded 3 samples, "
"mean = 40.0",
"Histogram: MonitorHistogram2 recorded 2 samples, "
"mean = 15.0"));
}
} // namespace content
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