ChromeOs Power Emulation Impl

chromeos/dbus/fake_power_manager_client_unittest.cc

+// Copyright 2015 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 "chromeos/dbus/fake_power_manager_client.h"
+
+#include "base/observer_list.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromeos {
+
+class FakePowerManagerClientTest : public testing::Test,
+                                   public FakePowerManagerClient::Observer {

[oshima, 2015/07/09 00:15:41]

Please define a separate Observer class.

+ public:
+  FakePowerManagerClientTest() {}
+
+  void PowerChanged(
+      const power_manager::PowerSupplyProperties& proto) override {
+    props_ = proto;
+  }
+
+ protected:
+  FakePowerManagerClient client_;

[oshima, 2015/07/09 00:15:40]

you can just create this on stack in the test body and you can eliminate this
test class.

+  power_manager::PowerSupplyProperties props_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakePowerManagerClientTest);
+};
+
+TEST_F(FakePowerManagerClientTest, UpdatePowerPropertiesTest) {
+  // Checking to verify when UpdatePowerProperties is called,
+  // |props_| values are updated.
+  client_.UpdatePowerProperties(
+      90, true, power_manager::PowerSupplyProperties_BatteryState_CHARGING,
+      power_manager::PowerSupplyProperties_ExternalPower_USB);
+
+  EXPECT_EQ(90, client_.props().battery_percent());
+  EXPECT_TRUE(client_.props().is_calculating_battery_time());
+  EXPECT_EQ(power_manager::PowerSupplyProperties_BatteryState_CHARGING,
+            client_.props().battery_state());
+  EXPECT_EQ(power_manager::PowerSupplyProperties_ExternalPower_USB,
+            client_.props().external_power());
+}
+
+TEST_F(FakePowerManagerClientTest, NotifyObserversTest) {
+  // Test adding observer.
+  client_.AddObserver(this);
+  EXPECT_TRUE(client_.observers().HasObserver(this));
+
+  // Test if NotifyObservers sends the corrent values to |this.props_|.
+  client_.UpdatePowerProperties(
+      90, false, power_manager::PowerSupplyProperties_BatteryState_DISCHARGING,
+      power_manager::PowerSupplyProperties_ExternalPower_DISCONNECTED);
+
+  EXPECT_EQ(this->props_.battery_percent(), client_.props().battery_percent());

[oshima, 2015/07/09 00:15:40]

please test against the actual value set instead.

+  EXPECT_EQ(this->props_.is_calculating_battery_time(),
+            client_.props().is_calculating_battery_time());
+  EXPECT_EQ(this->props_.battery_state(), client_.props().battery_state());
+  EXPECT_EQ(this->props_.external_power(), client_.props().external_power());
+
+  // Check number of times NotifyObservers is called.
+  EXPECT_EQ(1, client_.num_request_notify_observers());
+
+  // Test removing observer
+  client_.RemoveObserver(this);
+  EXPECT_FALSE(client_.observers().HasObserver(this));
+}
+
+}  // namespace chromeos