DiffEngine example

  }

  /** * Tests whether op classes returned by DiffEngine::diff() match expectations. * * @covers ::diff * @dataProvider provideTestDiff */
  public function testDiff($expected, $from, $to) {
    $this->expectDeprecation('Drupal\Component\Diff\Engine\DiffEngine is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use sebastianbergmann/diff instead. See https://www.drupal.org/node/3337942');
    $diff_engine = new DiffEngine();
    $diff = $diff_engine->diff($from, $to);
    // Make sure we have the same number of results as expected.     $this->assertSameSize($expected, $diff);
    // Make sure the diff objects match our expectations.     foreach ($expected as $index => $op_class) {
      $this->assertEquals($op_class, get_class($diff[$index]));
    }
  }

  /** * Tests that two files can be successfully diffed. * * @covers ::diff */