Adds new test for ApplicationState sorting function.

/*

 * Copyright (C) 2021 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.

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package com.android.settingslib.applications;

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

import android.content.Context;

import android.content.Intent;

import android.content.pm.ApplicationInfo;

import androidx.test.core.app.ActivityScenario;

import androidx.test.ext.junit.rules.ActivityScenarioRule;

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

import androidx.test.filters.SmallTest;

import com.android.settings.Settings;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import java.util.UUID;

@RunWith(AndroidJUnit4.class)

@SmallTest

public class ApplicationStateComponentTest {

    private static final String TAG =

            ApplicationStateComponentTest.class.getSimpleName();

    private Context mRuntimeApplication;

    private ApplicationsState mApplicationsState;

    @Rule

    public ActivityScenarioRule<Settings.ManageApplicationsActivity> rule =

            new ActivityScenarioRule<>(

                    new Intent(

                            android.provider.Settings.ACTION_MANAGE_ALL_APPLICATIONS_SETTINGS)

                            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));

    private ApplicationsState.AppEntry createAppEntry(String label, String packageName, int id) {

        ApplicationInfo appInfo = createApplicationInfo(packageName, id);

        ApplicationsState.AppEntry appEntry = new ApplicationsState.AppEntry(mRuntimeApplication,

                appInfo, id);

        appEntry.label = label;

        appEntry.mounted = true;

        return appEntry;

    }

    private ApplicationInfo createApplicationInfo(String packageName, int uid) {

        ApplicationInfo appInfo = new ApplicationInfo();

        appInfo.sourceDir = "foo";

        appInfo.flags |= ApplicationInfo.FLAG_INSTALLED;

        appInfo.storageUuid = UUID.randomUUID();

        appInfo.packageName = packageName;

        appInfo.uid = uid;

        return appInfo;

    }

    @Test

    public void test_all_apps_sorting_alpha() {

        // TODO: Potential unit test candidate.

        // To test all app list has sorted alphabetical, only need to verify sort function.

        // This case focus on logic in sort function, and ignore origin locale sorting rule by Java.

        ActivityScenario scenario = rule.getScenario();

        scenario.onActivity(activity -> {

            mRuntimeApplication = activity.getApplication();

            mApplicationsState = ApplicationsState.getInstance(activity.getApplication());

            ApplicationsState.AppEntry entry1 = createAppEntry("Info01", "Package1", 0);

            ApplicationsState.AppEntry entry2 = createAppEntry("Info02", "Package1", 0);

            ApplicationsState.AppEntry entry3 = createAppEntry("Info01", "Package2", 0);

            ApplicationsState.AppEntry entry4 = createAppEntry("Info02", "Package2", 0);

            ApplicationsState.AppEntry entry5 = createAppEntry("Info02", "Package2", 1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry1, entry2)).isEqualTo(-1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry2, entry3)).isEqualTo(1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry3, entry2)).isEqualTo(-1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry3, entry3)).isEqualTo(0);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry1, entry3)).isEqualTo(-1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry4, entry5)).isEqualTo(-1);

            assertThat(ApplicationsState.ALPHA_COMPARATOR.compare(entry5, entry3)).isEqualTo(1);

        });

    }

}