Testing methods with parent call

[Lehmann Markus]

Hello everybody,

First of all, I wish you all a happy new year.
I'm having a testing problem and I hope you can help me with that since I have 
not found anything useful so far.
I am currently writing my first tests and I do not know how to deal with the 
case if a method calls its parent method.
How can you test something like that? I do not want to test the code of all 
parent classes.
Especially, more and more parents are added per module.
Example:

class test__newsletter extends test__newsletter_parent
{

  public function send()
  {
    parent::send();
    if ($this->_iNewsletterStatus === 1 || $this->_iNewsletterStatus === 2) {
      $aParams = oxRegistry::getConfig()->getRequestParameter("editval");
      $this->getUtils()->callTestAsync(
        test_aws_api_constants::EVENT_OXID_NL_FORM_DOI,
        $aParams['oxuser__oxusername']
      )
      ;
    }
  }

Is it possible to mock the parent call?

Thank you very much and greetings
Markus