/**
  * Registers a link template for the mock entity.
  *
  * @param string $link_template
  *   The link template to register.
  */
 protected function registerLinkTemplate($link_template)
 {
     $link_templates = [$link_template => "/test-entity/{test_entity}/{$link_template}"];
     $this->entityType->getLinkTemplates()->willReturn($link_templates);
 }