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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/debug/trace_event_system_stats_monitor.h"
      6 
      7 #include <sstream>
      8 #include <string>
      9 
     10 #include "base/debug/trace_event_impl.h"
     11 #include "base/message_loop/message_loop.h"
     12 #include "testing/gtest/include/gtest/gtest.h"
     13 
     14 namespace base {
     15 namespace debug {
     16 
     17 #if !defined(OS_IOS)
     18 // Tests for the system stats monitor.
     19 // Exists as a class so it can be a friend of TraceEventSystemStatsMonitor.
     20 class TraceSystemStatsMonitorTest : public testing::Test {
     21  public:
     22   TraceSystemStatsMonitorTest() {}
     23   virtual ~TraceSystemStatsMonitorTest() {}
     24 
     25  private:
     26   DISALLOW_COPY_AND_ASSIGN(TraceSystemStatsMonitorTest);
     27 };
     28 
     29 //////////////////////////////////////////////////////////////////////////////
     30 
     31 TEST_F(TraceSystemStatsMonitorTest, TraceEventSystemStatsMonitor) {
     32   MessageLoop message_loop;
     33 
     34   // Start with no observers of the TraceLog.
     35   EXPECT_EQ(0u, TraceLog::GetInstance()->GetObserverCountForTest());
     36 
     37   // Creating a system stats monitor adds it to the TraceLog observer list.
     38   scoped_ptr<TraceEventSystemStatsMonitor> system_stats_monitor(
     39       new TraceEventSystemStatsMonitor(
     40           message_loop.message_loop_proxy()));
     41   EXPECT_EQ(1u, TraceLog::GetInstance()->GetObserverCountForTest());
     42   EXPECT_TRUE(
     43       TraceLog::GetInstance()->HasEnabledStateObserver(
     44           system_stats_monitor.get()));
     45 
     46   // By default the observer isn't dumping memory profiles.
     47   EXPECT_FALSE(system_stats_monitor->IsTimerRunningForTest());
     48 
     49   // Simulate enabling tracing.
     50   system_stats_monitor->StartProfiling();
     51   message_loop.RunUntilIdle();
     52   EXPECT_TRUE(system_stats_monitor->IsTimerRunningForTest());
     53 
     54   // Simulate disabling tracing.
     55   system_stats_monitor->StopProfiling();
     56   message_loop.RunUntilIdle();
     57   EXPECT_FALSE(system_stats_monitor->IsTimerRunningForTest());
     58 
     59   // Deleting the observer removes it from the TraceLog observer list.
     60   system_stats_monitor.reset();
     61   EXPECT_EQ(0u, TraceLog::GetInstance()->GetObserverCountForTest());
     62 }
     63 #endif  // !defined(OS_IOS)
     64 
     65 }  // namespace debug
     66 }  // namespace base
     67