There are D8 snippets.

d8-snippets-1.php

// It creates an entety instance, etity_type=taxonomy_term .
$term = entity_create('taxonomy_term', array(
  'name' => 'test', 
  'vid' => 'client',
))->save();


// urlInfo return an entity route.
$this->drupalGet($entity->urlInfo());
$this->drupalGet($entity->urlInfo('drupal:content-translation-overview'));