Fix crash for AirplaneModePreferenceController when not available.

    }

    public void onResume() {

        if (mAirplaneModeEnabler != null) {

            mAirplaneModeEnabler.resume();

        }

    }

    @Override

    public void onPause() {

        if (mAirplaneModeEnabler != null) {

            mAirplaneModeEnabler.pause();

        }

    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == REQUEST_CODE_EXIT_ECM) {

/*

 * 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.network;

import static junit.framework.Assert.assertFalse;

import static junit.framework.Assert.assertTrue;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.when;

import android.content.Context;

import android.content.pm.PackageManager;

import android.content.res.Resources;

import android.support.v7.preference.Preference;

import android.support.v7.preference.PreferenceScreen;

import com.android.settings.TestConfig;

import com.android.settings.testutils.FakeFeatureFactory;

import com.android.settings.testutils.SettingsRobolectricTestRunner;

import com.android.settingslib.core.lifecycle.Lifecycle;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Answers;

import org.mockito.Mock;

import org.mockito.Mockito;

import org.mockito.MockitoAnnotations;

import org.robolectric.annotation.Config;

@RunWith(SettingsRobolectricTestRunner.class)

@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)

public class AirplaneModePreferenceControllerTest {

    @Mock(answer = Answers.RETURNS_DEEP_STUBS)

    private Context mContext;

    @Mock

    private Resources mResources;

    @Mock

    private PreferenceScreen mScreen;

    @Mock

    private PackageManager mPackageManager;

    private AirplaneModePreferenceController mController;

    private Lifecycle mLifecycle;

    private FakeFeatureFactory mFactory;

    @Before

    public void setUp() {

        MockitoAnnotations.initMocks(this);

        mFactory = FakeFeatureFactory.setupForTest(mContext);

        doReturn(mResources).when(mContext).getResources();

        doReturn(mPackageManager).when(mContext).getPackageManager();

        mController = spy(new AirplaneModePreferenceController(mContext, null));

        mLifecycle = new Lifecycle(() -> mLifecycle);

        mLifecycle.addObserver(mController);

    }

    @Test

    public void airplaneModePreference_shouldNotBeAvailable_ifHasLeanbackFeature() {

        when(mPackageManager.hasSystemFeature(PackageManager.FEATURE_LEANBACK)).thenReturn(true);

        assertFalse(mController.isAvailable());

        mController.displayPreference(mScreen);

        // This should not crash

        mController.onResume();

        mController.onPause();

    }

}