Add controller for battery saver button

Bug: 72228477
Test: RunSettingsRoboTests
Change-Id: Iae9096a10553ea761d099e1e72c1de56b693bac0

tests/robotests/src/com/android/settings/widget/TwoStateButtonPreferenceControllerTest.java

@@ -0,0 +1,105 @@
+/*
+ * 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.widget;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceScreen;
+import android.view.View;
+import android.widget.Button;
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class TwoStateButtonPreferenceControllerTest {
+    private static final String KEY = "pref_key";
+
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+    @Mock
+    private TwoStateButtonPreference mPreference;
+    private TwoStateButtonPreferenceController mController;
+    private Context mContext;
+    private Button mButtonOn;
+    private Button mButtonOff;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        doReturn(mPreference).when(mPreferenceScreen).findPreference(anyString());
+        mButtonOn = new Button(mContext);
+        doReturn(mButtonOn).when(mPreference).getStateOnButton();
+        mButtonOff = new Button(mContext);
+        doReturn(mButtonOff).when(mPreference).getStateOffButton();
+
+        mController = new TestButtonsPreferenceController(mContext, KEY);
+        mController.displayPreference(mPreferenceScreen);
+    }
+
+    @Test
+    public void testUpdateButtons_stateOn_onlyShowButtonOn() {
+        mController.updateButton(true /* stateOn */);
+
+        assertThat(mButtonOn.getVisibility()).isEqualTo(View.VISIBLE);
+        assertThat(mButtonOff.getVisibility()).isEqualTo(View.GONE);
+    }
+
+    @Test
+    public void testUpdateButtons_stateOff_onlyShowButtonOff() {
+        mController.updateButton(false /* stateOn */);
+
+        assertThat(mButtonOn.getVisibility()).isEqualTo(View.GONE);
+        assertThat(mButtonOff.getVisibility()).isEqualTo(View.VISIBLE);
+    }
+
+    /**
+     * Controller to test methods in {@link TwoStateButtonPreferenceController}
+     */
+    public static class TestButtonsPreferenceController extends
+            TwoStateButtonPreferenceController {
+
+        TestButtonsPreferenceController(Context context, String key) {
+            super(context, key);
+        }
+
+        @Override
+        public void onButtonClicked(boolean stateOn) {
+            //do nothing
+        }
+
+        @Override
+        public int getAvailabilityStatus() {
+            return AVAILABLE;
+        }
+    }
+}