[Testing] Use AndroidJUnit4 instead in AppPrefLoaderTest

/*

 * 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.datausage;

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

import static org.mockito.ArgumentMatchers.anyInt;

import static org.mockito.ArgumentMatchers.anyString;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.when;

import android.content.pm.ApplicationInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.graphics.drawable.Drawable;

import android.util.ArraySet;

import androidx.preference.Preference;

import androidx.test.core.app.ApplicationProvider;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

@RunWith(AndroidJUnit4.class)

public class AppPrefLoaderTest {

    @Mock

    private PackageManager mPackageManager;

    private AppPrefLoader mLoader;

    @Before

    public void setUp() throws Exception {

        MockitoAnnotations.initMocks(this);

        final ArraySet<String> pkgs = new ArraySet<>(2);

        pkgs.add("pkg0");

        pkgs.add("pkg1");

        mLoader = new AppPrefLoader(

                ApplicationProvider.getApplicationContext(), pkgs, mPackageManager);

    }

    @Test

    public void loadInBackground_packageNotFound_shouldReturnEmptySet()

            throws NameNotFoundException {

        when(mPackageManager.getApplicationInfo(anyString(), anyInt()))

            .thenThrow(new NameNotFoundException());

        assertThat(mLoader.loadInBackground()).isEmpty();

    }

    @Test

    public void loadInBackground_shouldReturnPreference() throws NameNotFoundException {

        ApplicationInfo info = mock(ApplicationInfo.class);

        when(mPackageManager.getApplicationInfo(anyString(), anyInt())).thenReturn(info);

        final Drawable drawable = mock(Drawable.class);

        final String label = "Label1";

        when(info.loadIcon(mPackageManager)).thenReturn(drawable);

        when(info.loadLabel(mPackageManager)).thenReturn(label);

        Preference preference = mLoader.loadInBackground().valueAt(0);

        assertThat(preference.getTitle()).isEqualTo(label);

        assertThat(preference.getIcon()).isEqualTo(drawable);

        assertThat(preference.isSelectable()).isFalse();

    }

}