Cleanup to screensaver settings for O

Reworked the way screensaver settings are laid out for O. Instead of
using the options menu and dialogs to navigate screensaver options,
there are now two rows: one row for the screensaver choice and
optionally its own settings, and one row for the "when to show" setting.
And now there's a nice obvious button you can press to preview your
choices.

Test: 'export ROBOTEST_FILTER="RadioButtonListFragmentTest";\
mmm -j20 packages/apps/Settings/tests/robotests'

Bug: 35031991
Change-Id: Ie7d2055fb45f6dfe72e34cb9598d9a25f7bee75a

tests/robotests/src/com/android/settings/dream/WhenToDreamPickerTest.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2017 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.dream;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.UserManager;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settingslib.dream.DreamBackend;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class WhenToDreamPickerTest {
+    private WhenToDreamPicker mPicker;
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private DreamBackend mBackend;
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Activity mActivity;
+    @Mock
+    private UserManager mUserManager;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        when(mActivity.getSystemService(Context.USER_SERVICE)).thenReturn(mUserManager);
+        FakeFeatureFactory.setupForTest(mActivity);
+
+        mPicker = new WhenToDreamPicker();
+        mPicker.onAttach((Context)mActivity);
+
+        ReflectionHelpers.setField(mPicker, "mBackend", mBackend);
+    }
+
+    @Test
+    public void getDefaultKeyReturnsCurrentWhenToDreamSetting() {
+        when(mBackend.getWhenToDreamSetting()).thenReturn(DreamBackend.WHILE_CHARGING);
+        assertThat(mPicker.getDefaultKey())
+                .isEqualTo(DreamSettings.getKeyFromSetting(DreamBackend.WHILE_CHARGING));
+
+        when(mBackend.getWhenToDreamSetting()).thenReturn(DreamBackend.WHILE_DOCKED);
+        assertThat(mPicker.getDefaultKey())
+                .isEqualTo(DreamSettings.getKeyFromSetting(DreamBackend.WHILE_DOCKED));
+
+        when(mBackend.getWhenToDreamSetting()).thenReturn(DreamBackend.EITHER);
+        assertThat(mPicker.getDefaultKey())
+                .isEqualTo(DreamSettings.getKeyFromSetting(DreamBackend.EITHER));
+
+        when(mBackend.getWhenToDreamSetting()).thenReturn(DreamBackend.NEVER);
+        assertThat(mPicker.getDefaultKey())
+                .isEqualTo(DreamSettings.getKeyFromSetting(DreamBackend.NEVER));
+    }
+
+    @Test
+    public void setDreamWhileCharging() {
+        String key = DreamSettings.getKeyFromSetting(DreamBackend.WHILE_CHARGING);
+        mPicker.setDefaultKey(key);
+        verify(mBackend).setWhenToDream(DreamBackend.WHILE_CHARGING);
+    }
+
+    @Test
+    public void setDreamWhileDocked() {
+        String key = DreamSettings.getKeyFromSetting(DreamBackend.WHILE_DOCKED);
+        mPicker.setDefaultKey(key);
+        verify(mBackend).setWhenToDream(DreamBackend.WHILE_DOCKED);
+    }
+
+    @Test
+    public void setDreamWhileChargingOrDocked() {
+        String key = DreamSettings.getKeyFromSetting(DreamBackend.EITHER);
+        mPicker.setDefaultKey(key);
+        verify(mBackend).setWhenToDream(DreamBackend.EITHER);
+    }
+
+    @Test
+    public void setDreamNever() {
+        String key = DreamSettings.getKeyFromSetting(DreamBackend.NEVER);
+        mPicker.setDefaultKey(key);
+        verify(mBackend).setWhenToDream(DreamBackend.NEVER);
+    }
+}