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// Copyright 2013 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/debug/trace_event_system_stats_monitor.h"
#include <sstream>
#include <string>
#include "base/debug/trace_event_impl.h"
#include "base/message_loop/message_loop.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace debug {
#if !defined(OS_IOS)
// Tests for the system stats monitor.
// Exists as a class so it can be a friend of TraceEventSystemStatsMonitor.
class TraceSystemStatsMonitorTest : public testing::Test {
public:
TraceSystemStatsMonitorTest() {}
virtual ~TraceSystemStatsMonitorTest() {}
private:
DISALLOW_COPY_AND_ASSIGN(TraceSystemStatsMonitorTest);
};
//////////////////////////////////////////////////////////////////////////////
TEST_F(TraceSystemStatsMonitorTest, TraceEventSystemStatsMonitor) {
MessageLoop message_loop;
// Start with no observers of the TraceLog.
EXPECT_EQ(0u, TraceLog::GetInstance()->GetObserverCountForTest());
// Creating a system stats monitor adds it to the TraceLog observer list.
scoped_ptr<TraceEventSystemStatsMonitor> system_stats_monitor(
new TraceEventSystemStatsMonitor(
message_loop.message_loop_proxy()));
EXPECT_EQ(1u, TraceLog::GetInstance()->GetObserverCountForTest());
EXPECT_TRUE(
TraceLog::GetInstance()->HasEnabledStateObserver(
system_stats_monitor.get()));
// By default the observer isn't dumping memory profiles.
EXPECT_FALSE(system_stats_monitor->IsTimerRunningForTest());
// Simulate enabling tracing.
system_stats_monitor->StartProfiling();
message_loop.RunUntilIdle();
EXPECT_TRUE(system_stats_monitor->IsTimerRunningForTest());
// Simulate disabling tracing.
system_stats_monitor->StopProfiling();
message_loop.RunUntilIdle();
EXPECT_FALSE(system_stats_monitor->IsTimerRunningForTest());
// Deleting the observer removes it from the TraceLog observer list.
system_stats_monitor.reset();
EXPECT_EQ(0u, TraceLog::GetInstance()->GetObserverCountForTest());
}
#endif // !defined(OS_IOS)
} // namespace debug
} // namespace base
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