Merge "Use a mock PackageManager instead of the real one" into main

package com.android.server.backup;

import static androidx.test.core.app.ApplicationProvider.getApplicationContext;

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

import static org.mockito.ArgumentMatchers.anyInt;

import static org.mockito.ArgumentMatchers.eq;

import static org.mockito.Mockito.when;

import android.app.backup.BackupDataInput;

import android.app.backup.BackupDataOutput;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.Signature;

import android.content.pm.SigningDetails;

import android.content.pm.SigningInfo;

import android.os.Build;

import android.os.ParcelFileDescriptor;

import android.platform.test.annotations.Presubmit;

import org.junit.Test;

import org.junit.rules.TemporaryFolder;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

import java.io.BufferedOutputStream;

import java.io.DataOutputStream;

public class PackageManagerBackupAgentTest {

    private static final String EXISTING_PACKAGE_NAME = "com.android.wallpaperbackup";

    private static final int EXISTING_PACKAGE_VERSION = 1;

    private static final int USER_ID = 0;

    @Rule public TemporaryFolder folder = new TemporaryFolder();

    private PackageManager mPackageManager;

    @Mock private PackageManager mPackageManager;

    private PackageManagerBackupAgent mPackageManagerBackupAgent;

    private ImmutableList<PackageInfo> mPackages;

    private File mBackupData, mOldState, mNewState;

    @Before

    public void setUp() throws Exception {

        mPackageManager = getApplicationContext().getPackageManager();

        MockitoAnnotations.initMocks(this);

        PackageInfo existingPackageInfo =

                mPackageManager.getPackageInfoAsUser(

                        EXISTING_PACKAGE_NAME, PackageManager.GET_SIGNING_CERTIFICATES, USER_ID);

                createPackage(EXISTING_PACKAGE_NAME, EXISTING_PACKAGE_VERSION);

        Signature sig = new Signature(new byte[256]);

        existingPackageInfo.signingInfo =

                new SigningInfo(new SigningDetails(new Signature[] {sig}, 1, null, null));

        when(mPackageManager.getPackageInfoAsUser(eq(EXISTING_PACKAGE_NAME), anyInt(), anyInt()))

                .thenReturn(existingPackageInfo);

        mPackages = ImmutableList.of(existingPackageInfo);

        mPackageManagerBackupAgent =

                new PackageManagerBackupAgent(mPackageManager, mPackages, USER_ID);