added support for reference transaction in expres checkout

Author: davidkoberan

src/Support/InstantUpdateApi/BillingAgreement.php

@@ -2,17 +2,19 @@
 
 namespace Omnipay\PayPal\Support\InstantUpdateApi;
 
+use Omnipay\Common\Exception\InvalidRequestException;
+
 class BillingAgreement
 {
     /**
      * Billing agreement types for single or recurring payment
      *
      * @var array
      */
-    protected $types = [
+    protected $types = array(
         'single' => 'MerchantInitiatedBillingSingleAgreement',
         'recurring' => 'MerchantInitiatedBilling',
-    ];
+    );
 
     /** @var string */
     private $type;

tests/Message/ExpressAuthorizeRequestTest.php

@@ -397,7 +397,7 @@ public function testGetDataWithRecurringBillingAgreement()
 
     public function testGetDataWithBillingAgreementOptionalParameters()
     {
-        $billingAgreement = new BillingAgreement(true, 'Some Stuff', 'InstantOnly ', 'Some custom annotation');
+        $billingAgreement = new BillingAgreement(true, 'Some Stuff', 'InstantOnly', 'Some custom annotation');
         $this->request->setBillingAgreement($billingAgreement);
 
         $data = $this->request->getData();
@@ -408,13 +408,16 @@ public function testGetDataWithBillingAgreementOptionalParameters()
         $this->assertSame('Some custom annotation', $data['L_BILLINGAGREEMENTCUSTOM0']);
     }
 
+    /**
+     *
+     */
     public function testGetDataWithBillingAgreementWrongPaymentType()
     {
-        $billingAgreement = new BillingAgreement(true, 'Some Stuff', 'BadType ', 'Some custom annotation');
-
         $this->setExpectedException(
             '\Omnipay\Common\Exception\InvalidRequestException',
             "The 'paymentType' parameter can be only 'Any' or 'InstantOnly'"
         );
+        
+        $billingAgreement = new BillingAgreement(false, 'Some Stuff', 'BadType', 'Some custom annotation');
     }
 }