Inheritance: extends Payum\Core\GatewayFactory
 /**
  * @test
  *
  * @expectedException \Payum\Core\Exception\LogicException
  * @expectedExceptionMessage The username, password, signature fields are required.
  */
 public function shouldThrowIfRequiredOptionsNotPassed()
 {
     $factory = new PaypalMasspayGatewayFactory();
     $gateway = $factory->create();
     $this->assertInstanceOf(Gateway::class, $gateway);
 }