use Drupal\Component\Diff\Engine\DiffOpCopy;
use Drupal\Component\Diff\Engine\DiffOpChange;
use Drupal\Component\Diff\Engine\DiffOpDelete;
+use PHPUnit\Framework\TestCase;
/**
* Test DiffEngine class.
*
* @group Diff
*/
-class DiffEngineTest extends \PHPUnit_Framework_TestCase {
+class DiffEngineTest extends TestCase {
/**
* @return array