CopyFieldValueTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\system\FunctionalJavascript;

use Drupal\FunctionalJavascriptTests\WebDriverTestBase;

/**
 * Tests copy field value functionality.
 *
 * @see Drupal.behaviors.copyFieldValue.
 *
 * @group system
 */
class CopyFieldValueTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'starterkit_theme';
    
    /**
     * Tests copy field value JavaScript functionality.
     */
    public function testCopyFieldValue() : void {
        $this->drupalGet('/system-test/copy-field-value-test-form');
        $page = $this->getSession()
            ->getPage();
        $source_field_selector = 'edit-source-field';
        $target_field = $page->find('css', '#edit-target-field');
        $random_string = $this->randomString();
        // Ensure that after source field has been filled, target field is filled
        // with the same value.
        $page->fillField($source_field_selector, $random_string);
        $target_field->focus();
        $this->assertEquals($target_field->getValue(), $random_string);
        // Ensure that the target value doesn't change after it has been focused.
        $page->fillField($source_field_selector, '');
        $target_field->focus();
        $this->assertEquals($target_field->getValue(), $random_string);
    }

}