Sylius\Behat\Page\Admin\Customer\ShowPageInterface::isSubscribedToNewsletter PHP Method

    public function isSubscribedToNewsletter();

 /**
  * @Then I should see that this customer is subscribed to the newsletter
  */
 public function iShouldSeeThatThisCustomerIsSubscribedToTheNewsletter()
 {
     Assert::true($this->showPage->isSubscribedToNewsletter(), 'There should be information that this customer is subscribed to the newsletter.');
 }