Decouple PowerUsageMonitor{Impl} from //content/browser

content/browser/power_usage_monitor_impl_unittest.cc

-// Copyright 2014 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 "content/browser/power_usage_monitor_impl.h"
-
-#include <utility>
-
-#include "content/public/browser/notification_types.h"
-#include "content/public/test/test_browser_thread_bundle.h"
-#include "device/battery/battery_monitor.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace content {
-
-// Dummy ID to identify a phantom RenderProcessHost in tests.
-const int kDummyRenderProcessHostID = 1;
-
-class SystemInterfaceForTest : public PowerUsageMonitor::SystemInterface {
- public:
-  SystemInterfaceForTest()
-      : num_pending_histogram_reports_(0),
-        discharge_percent_per_hour_(0),
-        now_(base::Time::FromInternalValue(1000)) {}
-  ~SystemInterfaceForTest() override {}
-
-  int num_pending_histogram_reports() const {
-    return num_pending_histogram_reports_;
-  }
-
-  int discharge_percent_per_hour() const {
-    return discharge_percent_per_hour_;
-  }
-
-  void AdvanceClockSeconds(int seconds) {
-    now_ += base::TimeDelta::FromSeconds(seconds);
-  }
-
-  void AdvanceClockMinutes(int minutes) {
-    now_ += base::TimeDelta::FromMinutes(minutes);
-  }
-
-  void ScheduleHistogramReport(base::TimeDelta delay) override {
-    num_pending_histogram_reports_++;
-  }
-
-  void CancelPendingHistogramReports() override {
-    num_pending_histogram_reports_ = 0;
-  }
-
-  void RecordDischargePercentPerHour(int percent_per_hour) override {
-    discharge_percent_per_hour_ = percent_per_hour;
-  }
-
-  base::Time Now() override { return now_; }
-
- private:
-  int num_pending_histogram_reports_;
-  int discharge_percent_per_hour_;
-  base::Time now_;
-};
-
-class PowerUsageMonitorTest : public testing::Test {
- protected:
-  void SetUp() override {
-    monitor_.reset(new PowerUsageMonitor);
-    // PowerUsageMonitor assumes ownership.
-    std::unique_ptr<SystemInterfaceForTest> test_interface(
-        new SystemInterfaceForTest());
-    system_interface_ = test_interface.get();
-    monitor_->SetSystemInterfaceForTest(std::move(test_interface));
-
-    // Without live renderers, the monitor won't do anything.
-    monitor_->OnRenderProcessNotification(NOTIFICATION_RENDERER_PROCESS_CREATED,
-                                          kDummyRenderProcessHostID);
-  }
-
-  void UpdateBatteryStatus(bool charging, double battery_level) {
-    device::BatteryStatus battery_status;
-    battery_status.charging = charging;
-    battery_status.level = battery_level;
-    monitor_->OnBatteryStatusUpdate(battery_status);
-  }
-
-  void KillTestRenderer() {
-    monitor_->OnRenderProcessNotification(
-        NOTIFICATION_RENDERER_PROCESS_CLOSED, kDummyRenderProcessHostID);
-  }
-
-  std::unique_ptr<PowerUsageMonitor> monitor_;
-  SystemInterfaceForTest* system_interface_;
-  TestBrowserThreadBundle thread_bundle_;
-};
-
-TEST_F(PowerUsageMonitorTest, StartStopQuickly) {
-  // Going on battery power.
-  UpdateBatteryStatus(false, 1.0);
-  int initial_num_histogram_reports =
-      system_interface_->num_pending_histogram_reports();
-  ASSERT_GT(initial_num_histogram_reports, 0);
-
-  // Battery level goes down a bit.
-  system_interface_->AdvanceClockSeconds(1);
-  UpdateBatteryStatus(false, 0.9);
-  ASSERT_EQ(initial_num_histogram_reports,
-            system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-
-  // Wall power connected.
-  system_interface_->AdvanceClockSeconds(30);
-  UpdateBatteryStatus(true, 0);
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-}
-
-TEST_F(PowerUsageMonitorTest, DischargePercentReported) {
-  // Going on battery power.
-  UpdateBatteryStatus(false, 1.0);
-  int initial_num_histogram_reports =
-      system_interface_->num_pending_histogram_reports();
-  ASSERT_GT(initial_num_histogram_reports, 0);
-
-  // Battery level goes down a bit.
-  system_interface_->AdvanceClockSeconds(30);
-  UpdateBatteryStatus(false, 0.9);
-  ASSERT_EQ(initial_num_histogram_reports,
-            system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-
-  // Wall power connected.
-  system_interface_->AdvanceClockMinutes(31);
-  UpdateBatteryStatus(true, 0);
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-  ASSERT_GT(system_interface_->discharge_percent_per_hour(), 0);
-}
-
-TEST_F(PowerUsageMonitorTest, NoRenderersDisablesMonitoring) {
-  KillTestRenderer();
-
-  // Going on battery power.
-  UpdateBatteryStatus(false, 1.0);
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-
-  // Wall power connected.
-  system_interface_->AdvanceClockSeconds(30);
-  UpdateBatteryStatus(true, 0.5);
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-}
-
-TEST_F(PowerUsageMonitorTest, NoRenderersCancelsInProgressMonitoring) {
-  // Going on battery power.
-  UpdateBatteryStatus(false, 1.0);
-  ASSERT_GT(system_interface_->num_pending_histogram_reports(), 0);
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-
-  // All renderers killed.
-  KillTestRenderer();
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-
-  // Wall power connected.
-  system_interface_->AdvanceClockMinutes(31);
-  UpdateBatteryStatus(true, 0);
-  ASSERT_EQ(0, system_interface_->num_pending_histogram_reports());
-  ASSERT_EQ(0, system_interface_->discharge_percent_per_hour());
-}
-
-}  // namespace content