Mockery\Expectation::andReturnUndefined PHP Method

    public function andReturnUndefined()
    {
        $this->andReturn(new \Mockery\Undefined());
        return $this;
    }

 /**
  * @return $this
  */
 public function andReturnUndefined()
 {
     $this->expectation->andReturnUndefined();
     return $this;
 }