simplytest-8.x-4.x-dev/modules/simplytest_projects/src/Form/SimplytestProjectEntityForm.php

<?php

namespace Drupal\simplytest_projects\Form;

use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Form\FormStateInterface;

/**
 * Class PracticalEntityForm.
 */
class SimplytestProjectEntityForm extends ContentEntityForm {

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $entity = &$this->entity;
    $message_params = [
      '%entity_label' => $entity->id(),
      '%content_entity_label' => $entity->getEntityType()->getLabel()->render(),
    ];

    $status = parent::save($form, $form_state);

    switch ($status) {
      case SAVED_NEW:
        $this->messenger()->addMessage($this->t('Created %content_entity_label entity:  %entity_label.', $message_params));
        break;

      default:
        $this->messenger()->addMessage($this->t('Saved %content_entity_label entity:  %entity_label.', $message_params));
    }

    $content_entity_id = $entity->getEntityType()->id();
    $form_state->setRedirect("entity.{$content_entity_id}.canonical", [$content_entity_id => $entity->id()]);
  }

}