Neos\Flow\Session\TransientSession::hasKey PHP Метод

    public function hasKey($key)
    {
        return array_key_exists($key, $this->data);
    }

 /**
  * @test
  */
 public function hasKeyReturnsTrueOrFalseAccordingToAvailableKeys()
 {
     $session = new Session\TransientSession();
     $session->start();
     $session->putData('theKey', 'some data');
     $this->assertTrue($session->hasKey('theKey'));
     $this->assertFalse($session->hasKey('noKey'));
 }