ManagedFileTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\file\Kernel;

use Drupal\Core\Form\FormInterface;
use Drupal\Core\Form\FormState;
use Drupal\Core\Form\FormStateInterface;

/**
 * Managed file element test.
 *
 * @group file
 *
 * @see \Drupal\file\Element\ManagedFile
 */
class ManagedFileTest extends FileManagedUnitTestBase implements FormInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'form_test_managed_file';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['managed_file'] = [
            '#type' => 'managed_file',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
    }
    
    /**
     * Tests that managed file elements can be programmatically submitted.
     */
    public function testManagedFileElement() : void {
        $form_state = new FormState();
        $values['managed_file'] = NULL;
        $form_state->setValues($values);
        $this->container
            ->get('form_builder')
            ->submitForm($this, $form_state);
        // Should submit without any errors.
        $this->assertEquals(0, count($form_state->getErrors()));
    }

}