Create a fragment class for the new "Hotspot & tethering" screen

This fragment class is created to display Wifi tether settings, Usb
tether settings and bluetooth tether settings within the single "Hotspot &
tethering" screen. By creating a new fragemnt, we can safely change the
UI by replace fragment name in xml file.
Right now, it only supports wifi tether settings and mostly copied from
WifiTetherSettings.java.

Bug: 146447611
Test: AllInOneTetherSettingsTest is created and run.
Change-Id: Icdac0d4930451e6956dbf6ef0f4b65bce96fed3f

tests/robotests/src/com/android/settings/AllInOneTetherSettingsTest.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2020 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;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.os.UserHandle;
+import android.os.UserManager;
+
+import com.android.settings.testutils.shadow.ShadowWifiManager;
+import com.android.settings.wifi.tether.WifiTetherAutoOffPreferenceController;
+
+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.annotation.Config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(shadows = {ShadowWifiManager.class})
+public class AllInOneTetherSettingsTest {
+    private static final String[] WIFI_REGEXS = {"wifi_regexs"};
+
+    private Context mContext;
+    private AllInOneTetherSettings mAllInOneTetherSettings;
+
+    @Mock
+    private ConnectivityManager mConnectivityManager;
+    @Mock
+    private UserManager mUserManager;
+
+    @Before
+    public void setUp() {
+        mContext = spy(RuntimeEnvironment.application);
+
+        MockitoAnnotations.initMocks(this);
+        doReturn(mConnectivityManager)
+                .when(mContext).getSystemService(Context.CONNECTIVITY_SERVICE);
+        doReturn(WIFI_REGEXS).when(mConnectivityManager).getTetherableWifiRegexs();
+        doReturn(mUserManager).when(mContext).getSystemService(Context.USER_SERVICE);
+
+        mAllInOneTetherSettings = new AllInOneTetherSettings();
+    }
+
+    @Test
+    public void getNonIndexableKeys_tetherAvailable_keysNotReturned() {
+        // To let TetherUtil.isTetherAvailable return true, select one of the combinations
+        setupIsTetherAvailable(true);
+
+        final List<String> niks =
+                AllInOneTetherSettings.SEARCH_INDEX_DATA_PROVIDER.getNonIndexableKeys(mContext);
+
+        assertThat(niks).doesNotContain(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_NAME);
+        assertThat(niks).doesNotContain(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_PASSWORD);
+        assertThat(niks).doesNotContain(AllInOneTetherSettings.KEY_WIFI_TETHER_AUTO_OFF);
+        assertThat(niks).doesNotContain(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_AP_BAND);
+        assertThat(niks).doesNotContain(AllInOneTetherSettings.KEY_TETHER_PREFS_SCREEN);
+    }
+
+    @Test
+    public void getNonIndexableKeys_tetherNotAvailable_keysReturned() {
+        // To let TetherUtil.isTetherAvailable return false, select one of the combinations
+        setupIsTetherAvailable(false);
+
+        final List<String> niks =
+                AllInOneTetherSettings.SEARCH_INDEX_DATA_PROVIDER.getNonIndexableKeys(mContext);
+
+        assertThat(niks).contains(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_NAME);
+        assertThat(niks).contains(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_PASSWORD);
+        assertThat(niks).contains(AllInOneTetherSettings.KEY_WIFI_TETHER_AUTO_OFF);
+        assertThat(niks).contains(AllInOneTetherSettings.KEY_WIFI_TETHER_NETWORK_AP_BAND);
+        assertThat(niks).contains(AllInOneTetherSettings.KEY_TETHER_PREFS_SCREEN);
+    }
+
+    @Test
+    public void getPreferenceControllers_notEmpty() {
+        assertThat(AllInOneTetherSettings.SEARCH_INDEX_DATA_PROVIDER
+                .getPreferenceControllers(mContext)).isNotEmpty();
+    }
+
+    @Test
+    public void createPreferenceControllers_hasAutoOffPreference() {
+        assertThat(mAllInOneTetherSettings.createPreferenceControllers(mContext)
+                .stream()
+                .filter(controller -> controller instanceof WifiTetherAutoOffPreferenceController)
+                .count())
+                .isEqualTo(1);
+    }
+
+    private void setupIsTetherAvailable(boolean returnValue) {
+        when(mConnectivityManager.isTetheringSupported()).thenReturn(true);
+
+        // For RestrictedLockUtils.checkIfRestrictionEnforced
+        final int userId = UserHandle.myUserId();
+        List<UserManager.EnforcingUser> enforcingUsers = new ArrayList<>();
+        when(mUserManager.getUserRestrictionSources(
+                UserManager.DISALLOW_CONFIG_TETHERING, UserHandle.of(userId)))
+                .thenReturn(enforcingUsers);
+
+        // For RestrictedLockUtils.hasBaseUserRestriction
+        when(mUserManager.hasBaseUserRestriction(
+                UserManager.DISALLOW_CONFIG_TETHERING, UserHandle.of(userId)))
+                .thenReturn(!returnValue);
+    }
+}