$this->assertDirectoryPermissions($directory, $old_mode);
// Check creating a directory using an absolute path.
- $absolute_path = drupal_realpath($directory) . DIRECTORY_SEPARATOR . $this->randomMachineName() . DIRECTORY_SEPARATOR . $this->randomMachineName();
+ $absolute_path = \Drupal::service('file_system')->realpath($directory) . DIRECTORY_SEPARATOR . $this->randomMachineName() . DIRECTORY_SEPARATOR . $this->randomMachineName();
$this->assertTrue(drupal_mkdir($absolute_path, 0775, TRUE), 'No error reported when creating new absolute directories.', 'File');
$this->assertDirectoryPermissions($absolute_path, 0775);
}