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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/metrics/task_switch_time_tracker.h"
#include <memory>
#include <string>
#include "ash/metrics/task_switch_time_tracker_test_api.h"
#include "base/test/metrics/histogram_tester.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ash {
namespace {
// A dummy histogram name.
const std::string kHistogramName = "Dummy.Histogram";
} // namespace
class TaskSwitchTimeTrackerTest : public testing::Test {
public:
TaskSwitchTimeTrackerTest();
TaskSwitchTimeTrackerTest(const TaskSwitchTimeTrackerTest&) = delete;
TaskSwitchTimeTrackerTest& operator=(const TaskSwitchTimeTrackerTest&) =
delete;
~TaskSwitchTimeTrackerTest() override;
// testing::Test:
void SetUp() override;
void TearDown() override;
// Wrapper to the test targets OnTaskSwitch() method.
void OnTaskSwitch();
TaskSwitchTimeTracker* time_tracker() {
return time_tracker_test_api_->time_tracker();
}
protected:
// Used to verify recorded histogram data.
std::unique_ptr<base::HistogramTester> histogram_tester_;
// A Test API that wraps the test target.
std::unique_ptr<TaskSwitchTimeTrackerTestAPI> time_tracker_test_api_;
};
TaskSwitchTimeTrackerTest::TaskSwitchTimeTrackerTest() = default;
TaskSwitchTimeTrackerTest::~TaskSwitchTimeTrackerTest() = default;
void TaskSwitchTimeTrackerTest::SetUp() {
testing::Test::SetUp();
histogram_tester_ = std::make_unique<base::HistogramTester>();
time_tracker_test_api_ =
std::make_unique<TaskSwitchTimeTrackerTestAPI>(kHistogramName);
// The TaskSwitchTimeTracker interprets a value of base::TimeTicks() as if the
// |last_action_time_| has not been set.
time_tracker_test_api_->Advance(base::Milliseconds(1));
}
void TaskSwitchTimeTrackerTest::TearDown() {
testing::Test::TearDown();
time_tracker_test_api_.reset();
histogram_tester_.reset();
}
void TaskSwitchTimeTrackerTest::OnTaskSwitch() {
time_tracker()->OnTaskSwitch();
}
// Verifies TaskSwitchTimeTracker::HasLastActionTime() returns false after
// construction.
TEST_F(TaskSwitchTimeTrackerTest,
HasLastActionTimeShouldBeFalseAfterConstruction) {
EXPECT_FALSE(time_tracker_test_api_->HasLastActionTime());
}
// Verifies TaskSwitchTimeTracker::HasLastActionTime() returns true after the
// first call to TaskSwitchTimeTracker::OnTaskSwitch() and no histogram data was
// recorded.
TEST_F(TaskSwitchTimeTrackerTest,
HasLastActionTimeShouldBeTrueAfterOnTaskSwitch) {
OnTaskSwitch();
histogram_tester_->ExpectTotalCount(kHistogramName, 0);
}
// Verfies that the histogram data is recorded in the correct buckets.
TEST_F(TaskSwitchTimeTrackerTest, RecordAfterTwoTaskSwitches) {
OnTaskSwitch();
time_tracker_test_api_->Advance(base::Milliseconds(2));
OnTaskSwitch();
histogram_tester_->ExpectTotalCount(kHistogramName, 1);
histogram_tester_->ExpectBucketCount(kHistogramName, 0, 1);
time_tracker_test_api_->Advance(base::Seconds(1));
OnTaskSwitch();
histogram_tester_->ExpectTotalCount(kHistogramName, 2);
histogram_tester_->ExpectBucketCount(kHistogramName, 1, 1);
}
} // namespace ash
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