public function testVoidSuccess()
{
$this->setMockHttpResponse('ExpressVoidSuccess.txt');
$response = $this->gateway->void($this->voidOptions)->send();
$this->assertInstanceOf('\\Omnipay\\PayPal\\Message\\Response', $response);
$this->assertTrue($response->isSuccessful());
$this->assertFalse($response->isRedirect());
$this->assertEquals('ASDFASDFASDF', $response->getTransactionReference());
}