Payment/Refund break up
Inheritance: extends PayPal\Common\PayPalModel
 /**
  * @depends testSerializationDeserialization
  * @param PaymentSummary $obj
  */
 public function testGetters($obj)
 {
     $this->assertEquals($obj->getPaypal(), CurrencyTest::getObject());
     $this->assertEquals($obj->getOther(), CurrencyTest::getObject());
 }