DiffOpTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Component\Diff\Engine;

use Drupal\Component\Diff\Engine\DiffOp;
use Drupal\Tests\Traits\PhpUnitWarnings;
use PHPUnit\Framework\TestCase;
use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;

/**
 * Test DiffOp base class.
 *
 * The only significant behavior here is that ::reverse() should throw an error
 * if not overridden. In versions of this code in other projects, reverse() is
 * marked as abstract, which enforces some of this behavior.
 *
 * @coversDefaultClass \Drupal\Component\Diff\Engine\DiffOp
 *
 * @group Diff
 * @group legacy
 */
class DiffOpTest extends TestCase {
    use ExpectDeprecationTrait;
    use PhpUnitWarnings;
    
    /**
     * DiffOp::reverse() always throws an error.
     *
     * @covers ::reverse
     */
    public function testReverse() : void {
        $this->expectDeprecation('Drupal\\Component\\Diff\\Engine\\DiffOp::reverse() is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. There is no replacement. See https://www.drupal.org/node/3337942');
        $this->expectError();
        $op = new DiffOp();
        $result = $op->reverse();
    }

}