/**
* Invokes factory method to instantiates a new Exchange Service
*
* @param object|string|null $service The exchange service used for getting exchange rate
* @return CurrencyExchange\Exchanger
*/
public function setService($service = null)
{
$this->_service = ServiceFactory::factory($service);
return $this;
}
public function testServiceFactoryInstantiatesYahooFinanceServiceAsDefault()
{
$instance = ServiceFactory::factory();
return $this->assertInstanceOf('\\CurrencyExchange\\Service\\YahooFinance', $instance);
}