Don't allow setting channels to bypass DND if the app cannot show notifications

The fix makes the flow more consistent with preexisting behavior:
* Apps appear in the "Apps that can interrupt" section only if some channels are set to bypass DND *and* the app is able to show notifications.
* Channels cannot be set to bypass if those individual channels are blocked.

Fixes: 265064188
Test: atest AppChannelsBypassingDndPreferenceControllerTest
Change-Id: If10f086fd60f0f70f53adb8f5cd67f90936bc35f

tests/robotests/src/com/android/settings/notification/app/AppChannelsBypassingDndPreferenceControllerTest.java

@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2023 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.app;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+
+import android.app.NotificationChannel;
+import android.app.NotificationChannelGroup;
+import android.app.NotificationManager;
+import android.content.Context;
+import android.content.pm.ParceledListSlice;
+
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.notification.NotificationBackend;
+import com.android.settingslib.PrimarySwitchPreference;
+
+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.shadows.ShadowApplication;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+@RunWith(RobolectricTestRunner.class)
+public class AppChannelsBypassingDndPreferenceControllerTest {
+
+    @Mock
+    private NotificationBackend mBackend;
+
+    private NotificationBackend.AppRow mAppRow;
+    private AppChannelsBypassingDndPreferenceController mController;
+
+    private PreferenceScreen mPreferenceScreen;
+    private PreferenceCategory mCategory;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        Context context = ApplicationProvider.getApplicationContext();
+
+        mAppRow = new NotificationBackend.AppRow();
+        mAppRow.uid = 42;
+        mAppRow.pkg = "com.example.exampling";
+
+        mController = new AppChannelsBypassingDndPreferenceController(context, mBackend);
+        mController.onResume(mAppRow, null, null, null, null, null, new ArrayList<>());
+
+        PreferenceManager preferenceManager = new PreferenceManager(context);
+        mPreferenceScreen = preferenceManager.createPreferenceScreen(context);
+        mCategory = new PreferenceCategory(context);
+        mCategory.setKey(AppChannelsBypassingDndPreferenceController.KEY);
+        mPreferenceScreen.addPreference(mCategory);
+    }
+
+    @Test
+    public void displayPreference_showsAllAndChannels() {
+        when(mBackend.getGroups(eq(mAppRow.pkg), eq(mAppRow.uid))).thenReturn(
+                buildGroupList(true, true, false));
+
+        mController.displayPreference(mPreferenceScreen);
+        ShadowApplication.runBackgroundTasks();
+
+        assertThat(mCategory.getPreferenceCount()).isEqualTo(4); // "All" + 3 channels
+        assertThat(mCategory.getPreference(0).getTitle().toString()).isEqualTo(
+                "Allow all notifications");
+        assertThat(mCategory.getPreference(1).getTitle().toString()).isEqualTo("Channel 1");
+        assertThat(mCategory.getPreference(2).getTitle().toString()).isEqualTo("Channel 2");
+        assertThat(mCategory.getPreference(3).getTitle().toString()).isEqualTo("Channel 3");
+    }
+
+    @Test
+    public void displayPreference_canToggleAllInterrupt() {
+        when(mBackend.getGroups(eq(mAppRow.pkg), eq(mAppRow.uid))).thenReturn(
+                buildGroupList(true, true, false));
+
+        mController.displayPreference(mPreferenceScreen);
+        ShadowApplication.runBackgroundTasks();
+
+        assertThat(mCategory.getPreference(0).isEnabled()).isTrue();
+    }
+
+    @Test
+    public void displayPreference_canToggleInterruptIfChannelEnabled() {
+        when(mBackend.getGroups(eq(mAppRow.pkg), eq(mAppRow.uid))).thenReturn(
+                buildGroupList(true, false, true));
+
+        mController.displayPreference(mPreferenceScreen);
+        ShadowApplication.runBackgroundTasks();
+
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                1)).isSwitchEnabled()).isTrue();
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                2)).isSwitchEnabled()).isFalse();
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                3)).isSwitchEnabled()).isTrue();
+    }
+
+    @Test
+    public void displayPreference_appBlocked_cannotToggleAllOrChannelInterrupts() {
+        mAppRow.banned = true;
+        when(mBackend.getGroups(eq(mAppRow.pkg), eq(mAppRow.uid))).thenReturn(
+                buildGroupList(true, false, true));
+
+        mController.displayPreference(mPreferenceScreen);
+        ShadowApplication.runBackgroundTasks();
+
+        assertThat(mCategory.getPreference(0).isEnabled()).isFalse();
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                1)).isSwitchEnabled()).isFalse();
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                2)).isSwitchEnabled()).isFalse();
+        assertThat(((PrimarySwitchPreference) mCategory.getPreference(
+                3)).isSwitchEnabled()).isFalse();
+    }
+
+    private static ParceledListSlice<NotificationChannelGroup> buildGroupList(
+            boolean... enabledByChannel) {
+        NotificationChannelGroup group = new NotificationChannelGroup("group", "The Group");
+        for (int i = 0; i < enabledByChannel.length; i++) {
+            group.addChannel(new NotificationChannel("channel-" + (i + 1), "Channel " + (i + 1),
+                    enabledByChannel[i] ? NotificationManager.IMPORTANCE_DEFAULT
+                            : NotificationManager.IMPORTANCE_NONE));
+        }
+        return new ParceledListSlice<>(Collections.singletonList(group));
+    }
+}