PreferenceControllers are the way of the future.

Migrates Notification settings (app level, group level, and channel
level) into PreferenceControllers (and most importantly:
PreferenceControllerTest)

Note: this removes the 'Advanced' preference group, but does
not yet use the standard system 'Advanced' grouping as it does
not currently support our use case (where we don't know how many
fields to show outside of 'Advanced' until onResume() and also
where we need fields to show below the 'Advanced' group).

Test: make RunSettingsRoboTests
Change-Id: Iddd1b4771922db322e5f73562e9d63ed077c5396

tests/robotests/src/com/android/settings/notification/DeletedChannelsPreferenceControllerTest.java

@@ -0,0 +1,129 @@
+/*
+ * 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.notification;
+
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertTrue;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.content.Context;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.TestConfig;
+import com.android.settings.wrapper.NotificationChannelGroupWrapper;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class DeletedChannelsPreferenceControllerTest {
+
+    private Context mContext;
+    @Mock
+    private NotificationBackend mBackend;
+    @Mock
+    private NotificationManager mNm;
+    @Mock
+    private UserManager mUm;
+
+    private DeletedChannelsPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        ShadowApplication shadowApplication = ShadowApplication.getInstance();
+        shadowApplication.setSystemService(Context.NOTIFICATION_SERVICE, mNm);
+        shadowApplication.setSystemService(Context.USER_SERVICE, mUm);
+        mContext = shadowApplication.getApplicationContext();
+        mController = new DeletedChannelsPreferenceController(mContext, mBackend);
+    }
+
+    @Test
+    public void noCrashIfNoOnResume() throws Exception {
+        mController.isAvailable();
+        mController.updateState(mock(Preference.class));
+    }
+
+    @Test
+    public void isAvailable_appScreen_notIfAppBlocked() throws Exception {
+        NotificationBackend.AppRow appRow = new NotificationBackend.AppRow();
+        appRow.banned = true;
+        mController.onResume(appRow, null, null, null);
+        assertFalse(mController.isAvailable());
+    }
+
+    @Test
+    public void isAvailable_groupScreen_never() throws Exception {
+        NotificationBackend.AppRow appRow = new NotificationBackend.AppRow();
+        mController.onResume(appRow, null, mock(NotificationChannelGroupWrapper.class), null);
+        assertFalse(mController.isAvailable());
+    }
+
+    @Test
+    public void isAvailable_channelScreen_never() throws Exception {
+        mController.onResume(
+                new NotificationBackend.AppRow(), mock(NotificationChannel.class), null, null);
+        assertFalse(mController.isAvailable());
+    }
+
+    @Test
+    public void isAvailable_appScreen_notIfNoDeletedChannels() throws Exception {
+        when(mBackend.getDeletedChannelCount(any(), anyInt())).thenReturn(0);
+        mController.onResume(new NotificationBackend.AppRow(), null, null, null);
+        assertFalse(mController.isAvailable());
+    }
+
+    @Test
+    public void isAvailable_appScreen() throws Exception {
+        when(mBackend.getDeletedChannelCount(any(), anyInt())).thenReturn(1);
+        mController.onResume(new NotificationBackend.AppRow(), null, null, null);
+        assertTrue(mController.isAvailable());
+    }
+
+    @Test
+    public void updateState() throws Exception {
+        when(mBackend.getDeletedChannelCount(any(), anyInt())).thenReturn(1);
+        mController.onResume(new NotificationBackend.AppRow(), null, null, null);
+
+        Preference pref = mock(Preference.class);
+        mController.updateState(pref);
+
+        verify(pref, times(1)).setEnabled(false);
+        verify(pref, times(1)).setSelectable(false);
+        verify(mBackend, times(1)).getDeletedChannelCount(any(), anyInt());
+        ArgumentCaptor<CharSequence> argumentCaptor = ArgumentCaptor.forClass(CharSequence.class);
+        verify(pref, times(1)).setTitle(argumentCaptor.capture());
+        assertTrue(argumentCaptor.getValue().toString().contains("1"));
+    }
+}