namespace Drupal\Tests\Component\Diff\Engine;
use Drupal\Component\Diff\Engine\DiffOp;
+use PHPUnit\Framework\TestCase;
/**
* Test DiffOp base class.
*
* @group Diff
*/
-class DiffOpTest extends \PHPUnit_Framework_TestCase {
+class DiffOpTest extends TestCase {
/**
* DiffOp::reverse() always throws an error.