Implements \Drupal\Drupal\Core\Form\ConfirmFormBase::buildForm().
\Drupal\config_test\ConfigTestInterface $config_test: (optional) The ConfigTestInterface object to delete.
Overrides ConfirmFormBase::buildForm
public function buildForm(array $form, array &$form_state, ConfigTestInterface $config_test = NULL) {
$this->configTest = $config_test;
return parent::buildForm($form, $form_state);
}