StateValuesCleanAdvancedTest.php

<?php

namespace Drupal\Tests\system\Functional\Form;

use Drupal\Tests\BrowserTestBase;
use Drupal\Tests\TestFileCreationTrait;

/**
 * Tests proper removal of submitted form values using
 * \Drupal\Core\Form\FormState::cleanValues() when having forms with elements
 * containing buttons like "managed_file".
 *
 * @group Form
 */
class StateValuesCleanAdvancedTest extends BrowserTestBase {
    use TestFileCreationTrait {
        getTestFiles as drupalGetTestFiles;
    }
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'file',
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * An image file path for uploading.
     *
     * @var string|bool
     */
    protected $image;
    
    /**
     * Tests \Drupal\Core\Form\FormState::cleanValues().
     */
    public function testFormStateValuesCleanAdvanced() {
        // Get an image for uploading.
        $image_files = $this->drupalGetTestFiles('image');
        $this->image = current($image_files);
        // Check if the physical file is there.
        $this->assertFileExists($this->image->uri);
        // "Browse" for the desired file.
        $edit = [
            'files[image]' => \Drupal::service('file_system')->realpath($this->image->uri),
        ];
        // Post the form.
        $this->drupalPostForm('form_test/form-state-values-clean-advanced', $edit, t('Submit'));
        // Expecting a 200 HTTP code.
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertRaw(t('You WIN!'), 'Found the success message.');
    }

}