Add tests for BackupSettingsActivity

package com.android.settings.backup;

import android.app.Activity;

import android.app.FragmentManager;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.os.Bundle;

import android.support.annotation.VisibleForTesting;

import android.util.Log;

 */

public class BackupSettingsActivity extends Activity {

    private static final String TAG = "BackupSettingsActivity";

    private FragmentManager mFragmentManager;

    @Override

    public void onCreate(Bundle savedInstanceState) {

            if (Log.isLoggable(TAG, Log.DEBUG)) {

                Log.d(TAG, "Manufacturer provided backup settings, showing the preference screen");

            }

            getFragmentManager().beginTransaction()

            // mFragmentManager can be set by {@link #setFragmentManager()} for testing

            if (mFragmentManager == null) {

                mFragmentManager = getFragmentManager();

            }

            mFragmentManager.beginTransaction()

                    .replace(android.R.id.content, new BackupSettingsFragment())

                    .commit();

        }

    }

    @VisibleForTesting

    void setFragmentManager(FragmentManager fragmentManager) {

        mFragmentManager = fragmentManager;

    }

}

 No newline at end of file

/*

 * 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.backup;

import static org.mockito.Matchers.any;

import static org.mockito.Matchers.anyInt;

import static org.mockito.Matchers.isA;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.verify;

import static org.robolectric.Shadows.shadowOf;

import android.app.Application;

import android.app.Fragment;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.app.backup.IBackupManager;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.os.IBinder;

import com.android.settings.SettingsRobolectricTestRunner;

import com.android.settings.TestConfig;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

import org.robolectric.Robolectric;

import org.robolectric.RuntimeEnvironment;

import org.robolectric.annotation.Config;

import org.robolectric.annotation.Implementation;

import org.robolectric.annotation.Implements;

import org.robolectric.res.builder.RobolectricPackageManager;

import org.robolectric.util.ActivityController;

import org.robolectric.shadows.ShadowActivity;

import static com.google.common.truth.Truth.assertThat;

@RunWith(SettingsRobolectricTestRunner.class)

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

        shadows = {BackupSettingsActivityTest.ShadowBackupSettingsHelper.class})

public class BackupSettingsActivityTest {

    private ActivityController<BackupSettingsActivity> mActivityController;

    private BackupSettingsActivity mActivity;

    private Application mApplication;

    private RobolectricPackageManager mPackageManager;

    private static boolean mIsBackupProvidedByOEM;

    @Mock

    private FragmentManager mFragmentManager;

    @Mock

    private FragmentTransaction mFragmentTransaction;

    @Mock

    private static Intent mIntent;

    @Mock

    private ComponentName mComponent;

    @Before

    public void setUp() {

        MockitoAnnotations.initMocks(this);

        mApplication = RuntimeEnvironment.application;

        mActivityController = Robolectric.buildActivity(BackupSettingsActivity.class);

        mActivity = mActivityController.get();

        mPackageManager = (RobolectricPackageManager) mApplication.getPackageManager();

        doReturn(mComponent).when(mIntent).getComponent();

    }

    @Test

    public void onCreate_launchActivity() {

        mIsBackupProvidedByOEM = false;

        // Testing the scenario when the activity is disabled

        mPackageManager.setComponentEnabledSetting(mComponent,

                PackageManager.COMPONENT_ENABLED_STATE_DISABLED, 0);

        mActivityController.create();

        // Verify that the component to launch was enabled.

        assertThat(mPackageManager.getComponentState(mComponent).newState)

                .isEqualTo(PackageManager.COMPONENT_ENABLED_STATE_ENABLED);

        // Verify that the intent returned by BackupSettingsHelper.getIntentForBackupSettings()

        // was launched.

        assertThat(shadowOf(mApplication).getNextStartedActivity()).isEqualTo(mIntent);

    }

    @Test

    public void onCreate_hasManufacturerIntent() {

        mIsBackupProvidedByOEM = true;

        // Fragments are tested separately, so mock out the manager.

        mActivity.setFragmentManager(mFragmentManager);

        doReturn(mFragmentTransaction).when(mFragmentTransaction).replace(anyInt(),

                any(Fragment.class));

        doReturn(mFragmentTransaction).when(mFragmentManager).beginTransaction();

        mActivityController.create();

        assertThat(shadowOf(mApplication).getNextStartedActivity()).isNull();

        verify(mFragmentTransaction).replace(anyInt(), isA(BackupSettingsFragment.class));

    }

    @Implements(BackupSettingsHelper.class)

    public static class ShadowBackupSettingsHelper {

        @Implementation

        public Intent getIntentForBackupSettings() {

            return mIntent;

        }

        @Implementation

        public boolean isBackupProvidedByManufacturer() {

            return mIsBackupProvidedByOEM;

        }

    }

}