public function testGetSetVersion()
 {
     $this->assertNotNull($this->paymentGateway->getVersion());
     $value = '3.2';
     $this->paymentGateway->setVersion($value);
     $this->assertEquals($value, $this->paymentGateway->getVersion());
     $config = array('version' => '3.2');
     $gateway = new PaymentGateway($config);
     $this->assertEquals($config['version'], $gateway->getVersion());
 }