Omnipay\PayPal\Message\RestSearchTransactionRequest::getData PHP Method

    public function getData()
    {
        $this->validate('agreementId', 'startDate', 'endDate');
        return array('start_date' => $this->getStartDate()->format('Y-m-d'), 'end_date' => $this->getEndDate()->format('Y-m-d'));
    }

 public function testGetData()
 {
     $data = $this->request->getData();
     $this->assertEquals('2015-09-01', $data['start_date']);
     $this->assertEquals('2015-09-30', $data['end_date']);
 }