setMerchantId() public method

public setMerchantId ( string $merchantId )
$merchantId string
 public function setUp()
 {
     $configuration = new Configuration();
     $configuration->setMerchantId('MY_MERCHANT_01')->setSecretKey('SECRET_KEY')->setPaymentEndpointUrl('https://secure.payu.com.tr/order/alu/v3')->setLoyaltyInquiryEndPointUrl('https://secure.payu.com.tr/api/loyalty-points/check');
     $this->configuration = $configuration;
     $this->client = new Client($configuration);
 }
 public function testSetMerchantId()
 {
     $this->configuration->setMerchantId('TestMerchantIdSetter');
     $this->assertEquals('TestMerchantIdSetter', $this->configuration->getMerchantId());
 }