Issue #3455183 by kim.pepper, mstrelan, xjm, mondrake: FileSaveUploadTest...

use Drupal\Core\Messenger\MessengerInterface;

use Drupal\KernelTests\KernelTestBase;

use org\bovigo\vfs\vfsStream;

use Symfony\Component\HttpFoundation\File\UploadedFile;

use Symfony\Component\HttpFoundation\Request;

use Symfony\Component\HttpFoundation\RequestStack;

   * {@inheritdoc}

   */

  protected function setUp(): void {

    \file_put_contents('test.bbb', 'test');

    parent::setUp();

    $filename = 'test.bbb';

    vfsStream::newFile($filename)

      ->at($this->vfsRoot)

      ->withContent('test');

    $request = new Request();

    $request->files->set('files', [

      'file' => new UploadedFile(

        path: 'test.bbb',

        originalName: 'test.bbb',

        path: vfsStream::url("root/$filename"),

        originalName: $filename,

        mimeType: 'text/plain',

        error: \UPLOAD_ERR_OK,

        test: TRUE