assertEntityType example

    // revisionable entity.     $entity_type_id = 'entity_test_rev';
    $storage = $this->entityTypeManager->getStorage($entity_type_id);
    $values = ['name' => $this->randomString()];
    $entity = $storage->create($values);
    $storage->save($entity);

    /** @var \Drupal\Core\Entity\ContentEntityInterface $revision */
    $revision = $storage->createRevision($entity, FALSE);
    $revision->save();
    $active = $this->entityRepository->getActive($entity_type_id, $entity->id(), $en_contexts);
    $this->assertEntityType($active, $entity_type_id);
    $this->assertSame($revision->getLoadedRevisionId(), $active->getLoadedRevisionId());

    /** @var \Drupal\Core\Entity\ContentEntityInterface $revision2 */
    $revision2 = $storage->createRevision($revision);
    $revision2->save();
    $active = $this->entityRepository->getActive($entity_type_id, $entity->id(), $en_contexts);
    $this->assertSame($revision2->getLoadedRevisionId(), $active->getLoadedRevisionId());

    // Check that the correct active variant is returned for a translatable     // non-revisionable entity.     $entity_type_id = 'entity_test_mul';