Revert "Remove battery saver condition."

This reverts commit 44b28f4a2b.
Bug: 121115306
Test: robotests

Reason for revert: Change of design

Change-Id: Ia2b9131595d582fd8300367f729fde2b3de81b6e

tests/robotests/src/com/android/settings/homepage/contextualcards/conditional/BatterySaverConditionControllerTest.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.homepage.contextualcards.conditional;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.content.IntentFilter;
+import android.os.PowerManager;
+
+import com.android.settings.fuelgauge.BatterySaverReceiver;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.Shadows;
+import org.robolectric.shadows.ShadowPowerManager;
+
+@RunWith(RobolectricTestRunner.class)
+public class BatterySaverConditionControllerTest {
+    @Mock
+    private ConditionManager mConditionManager;
+
+    private ShadowPowerManager mPowerManager;
+    private Context mContext;
+    private BatterySaverConditionController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        mPowerManager = Shadows.shadowOf(mContext.getSystemService(PowerManager.class));
+        mController = new BatterySaverConditionController(mContext, mConditionManager);
+    }
+
+    @Test
+    public void startMonitor_shouldRegisterReceiver() {
+        mController.startMonitoringStateChange();
+
+        verify(mContext).registerReceiver(any(BatterySaverReceiver.class), any(IntentFilter.class));
+    }
+
+    @Test
+    public void stopMonitor_shouldUnregisterReceiver() {
+        mController.startMonitoringStateChange();
+        mController.stopMonitoringStateChange();
+
+        verify(mContext).unregisterReceiver(any(BatterySaverReceiver.class));
+    }
+
+    @Test
+    public void isDisplayable_PowerSaverOn_true() {
+        mPowerManager.setIsPowerSaveMode(true);
+
+        assertThat(mController.isDisplayable()).isTrue();
+    }
+
+    @Test
+    public void isDisplayable_PowerSaverOff_false() {
+        mPowerManager.setIsPowerSaveMode(false);
+
+        assertThat(mController.isDisplayable()).isFalse();
+    }
+}

tests/robotests/src/com/android/settings/homepage/contextualcards/deviceinfo/BatteryInfoSliceTest.java

@@ -40,10 +40,10 @@ import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 
 @RunWith(RobolectricTestRunner.class)
-public class BatterySliceTest {
+public class BatteryInfoSliceTest {
 
     private Context mContext;
-    private BatterySlice mBatterySlice;
+    private BatteryInfoSlice mBatteryInfoSlice;
 
     @Before
     public void setUp() {
@@ -52,16 +52,16 @@ public class BatterySliceTest {
         // Set-up specs for SliceMetadata.
         SliceProvider.setSpecs(SliceLiveData.SUPPORTED_SPECS);
 
-        mBatterySlice = spy(new BatterySlice(mContext));
+        mBatteryInfoSlice = spy(new BatteryInfoSlice(mContext));
     }
 
     @Test
     public void getSlice_shouldBeCorrectSliceContent() {
-        doNothing().when(mBatterySlice).loadBatteryInfo();
-        doReturn("10%").when(mBatterySlice).getBatteryPercentString();
-        doReturn("test").when(mBatterySlice).getSummary();
+        doNothing().when(mBatteryInfoSlice).loadBatteryInfo();
+        doReturn("10%").when(mBatteryInfoSlice).getBatteryPercentString();
+        doReturn("test").when(mBatteryInfoSlice).getSummary();
 
-        final Slice slice = mBatterySlice.getSlice();
+        final Slice slice = mBatteryInfoSlice.getSlice();
 
         final SliceMetadata metadata = SliceMetadata.from(mContext, slice);
         assertThat(metadata.getTitle()).isEqualTo(