FileFieldValidateTest.php

<?php

namespace Drupal\Tests\file\FunctionalJavascript;

use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
use Drupal\Tests\file\Functional\FileFieldCreationTrait;
use Drupal\Tests\TestFileCreationTrait;

/**
 * Tests validation functions such as file type, max file size, max size per
 * node, and required.
 *
 * @group file
 */
class FileFieldValidateTest extends WebDriverTestBase {
    use FileFieldCreationTrait;
    use TestFileCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    public static $modules = [
        'node',
        'file',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Test the validation message is displayed only once for ajax uploads.
     */
    public function testAjaxValidationMessage() {
        $field_name = strtolower($this->randomMachineName());
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
        $this->createFileField($field_name, 'node', 'article', [], [
            'file_extensions' => 'txt',
        ]);
        $this->drupalLogin($this->drupalCreateUser([
            'access content',
            'create article content',
        ]));
        $page = $this->getSession()
            ->getPage();
        $this->drupalGet('node/add/article');
        $image_file = current($this->getTestFiles('image'));
        $image_path = $this->container
            ->get('file_system')
            ->realpath($image_file->uri);
        $page->attachFileToField('files[' . $field_name . '_0]', $image_path);
        $elements = $page->waitFor(10, function () use ($page) {
            return $page->findAll('css', '.messages--error');
        });
        $this->assertCount(1, $elements, 'Ajax validation messages are displayed once.');
    }

}