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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/controller/memory_usage_monitor.h"
#include <memory>
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/testing/task_environment.h"
#include "third_party/blink/renderer/platform/testing/unit_test_helpers.h"
namespace blink {
class CountingObserver : public MemoryUsageMonitor::Observer {
public:
void OnMemoryPing(MemoryUsage) override { ++count_; }
int count() const { return count_; }
private:
int count_ = 0;
};
class MemoryUsageMonitorTest : public testing::Test {
public:
MemoryUsageMonitorTest() = default;
void SetUp() override {
monitor_ = std::make_unique<MemoryUsageMonitor>();
MemoryUsageMonitor::SetInstanceForTesting(monitor_.get());
}
void TearDown() override {
MemoryUsageMonitor::SetInstanceForTesting(nullptr);
monitor_.reset();
}
private:
test::TaskEnvironment task_environment_;
std::unique_ptr<MemoryUsageMonitor> monitor_;
};
TEST_F(MemoryUsageMonitorTest, StartStopMonitor) {
std::unique_ptr<CountingObserver> observer =
std::make_unique<CountingObserver>();
EXPECT_FALSE(MemoryUsageMonitor::Instance().TimerIsActive());
MemoryUsageMonitor::Instance().AddObserver(observer.get());
EXPECT_TRUE(MemoryUsageMonitor::Instance().TimerIsActive());
EXPECT_EQ(0, observer->count());
test::RunDelayedTasks(base::Seconds(1));
EXPECT_EQ(1, observer->count());
test::RunDelayedTasks(base::Seconds(1));
EXPECT_EQ(2, observer->count());
MemoryUsageMonitor::Instance().RemoveObserver(observer.get());
test::RunDelayedTasks(base::Seconds(1));
EXPECT_EQ(2, observer->count());
EXPECT_FALSE(MemoryUsageMonitor::Instance().TimerIsActive());
}
class OneShotObserver : public CountingObserver {
public:
void OnMemoryPing(MemoryUsage usage) override {
MemoryUsageMonitor::Instance().RemoveObserver(this);
CountingObserver::OnMemoryPing(usage);
}
};
TEST_F(MemoryUsageMonitorTest, RemoveObserverFromNotification) {
std::unique_ptr<OneShotObserver> observer1 =
std::make_unique<OneShotObserver>();
std::unique_ptr<CountingObserver> observer2 =
std::make_unique<CountingObserver>();
MemoryUsageMonitor::Instance().AddObserver(observer1.get());
MemoryUsageMonitor::Instance().AddObserver(observer2.get());
EXPECT_EQ(0, observer1->count());
EXPECT_EQ(0, observer2->count());
test::RunDelayedTasks(base::Seconds(1));
EXPECT_EQ(1, observer1->count());
EXPECT_EQ(1, observer2->count());
test::RunDelayedTasks(base::Seconds(1));
EXPECT_EQ(1, observer1->count());
EXPECT_EQ(2, observer2->count());
}
} // namespace blink
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