Neos\Flow\Security\Account::setExpirationDate PHP Méthode

    public function setExpirationDate(\DateTime $expirationDate = null)
    {
        $this->expirationDate = $expirationDate;
    }

 /**
  * @test
  */
 public function isActiveReturnsFalseIfTheAccountHasAnExpirationDateInThePast()
 {
     $this->inject($this->account, 'now', new \DateTime());
     $this->account->setExpirationDate(new \DateTime('yesterday'));
     $this->assertFalse($this->account->isActive());
 }