Issue #3101720 by larowlan: HEAD broken on - updates required for prophecy 1.10.0

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Url;

use Drupal\Tests\UnitTestCase;

use Prophecy\Argument;

use Symfony\Component\HttpFoundation\RedirectResponse;

use Symfony\Component\HttpFoundation\Response;

   * @param callable $prepared_callback

   */

  public function testPrepareCallback($unprepared_callback, callable $prepared_callback) {

    $this->decoratedFormState->prepareCallback($unprepared_callback)

    $this->decoratedFormState->prepareCallback(Argument::is($unprepared_callback))

      ->willReturn($prepared_callback)

      ->shouldBeCalled();