Add PackageManagerInternal mock to prevent NPE

import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.mock;

import android.content.ComponentName;

import android.content.Context;

import android.content.pm.PackageManagerInternal;

import android.os.Handler;

import androidx.test.annotation.UiThreadTest;

import androidx.test.filters.FlakyTest;

import androidx.test.filters.SmallTest;

import com.android.server.LocalServices;

import com.android.server.appop.AppOpsService;

import com.android.server.wm.ActivityTaskManagerService;

import org.junit.AfterClass;

import org.junit.Before;

import org.junit.BeforeClass;

import org.junit.Rule;

import org.junit.Test;

@FlakyTest(bugId = 113616538)

public class AppErrorDialogTest {

    @BeforeClass

    public static void setUpOnce() {

        final PackageManagerInternal pm = mock(PackageManagerInternal.class);

        doReturn(new ComponentName("", "")).when(pm).getSystemUiServiceComponent();

        LocalServices.addService(PackageManagerInternal.class, pm);

    }

    @AfterClass

    public static void tearDownOnce() {

        LocalServices.removeServiceForTest(PackageManagerInternal.class);

    }

    @Rule

    public ServiceThreadRule mServiceThreadRule = new ServiceThreadRule();