DateElementTest.php

<?php

namespace Drupal\Tests\Core\Render\Element;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element\Date;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Render\Element\Date
 * @group Render
 */
class DateElementTest extends UnitTestCase {
    
    /**
     * @covers ::processDate
     * @group legacy
     */
    public function testProcessDate() : void {
        $element = [
            '#attributes' => [
                'type' => 'date',
            ],
            '#date_date_format' => 'Y-m-d',
        ];
        $complete_form = [];
        $this->expectDeprecation('Drupal\\Core\\Render\\Element\\Date::processDate() is deprecated in drupal:9.4.0 and is removed from drupal:10.0.0. There is no replacement. See https://www.drupal.org/node/3258267');
        Date::processDate($element, $this->createMock(FormStateInterface::class), $complete_form);
    }

}