Perhaps an explanation would be helpful too

amacneil · amacneil · commit 185368d54dfd · 2014-06-28T19:05:03.000-07:00
diff --git a/tests/Message/DirectAuthorizeRequestTest.php b/tests/Message/DirectAuthorizeRequestTest.php
@@ -84,6 +84,8 @@ public function testGetDataCustomerDetailsIgnoresStateOutsideUS()
 
         $data = $this->request->getData();
 
+        // these must be empty string, not null
+        // (otherwise Guzzle ignores them, and SagePay throws a fit)
         $this->assertSame('', $data['BillingState']);
         $this->assertSame('', $data['DeliveryState']);
     }

Original file line number	Diff line number	Diff line change
`@@ -84,6 +84,8 @@ public function testGetDataCustomerDetailsIgnoresStateOutsideUS()`
`84`	`84`
`85`	`85`	`$data = $this->request->getData();`
`86`	`86`
	`87`	`+ // these must be empty string, not null`
	`88`	`+ // (otherwise Guzzle ignores them, and SagePay throws a fit)`
`87`	`89`	`$this->assertSame('', $data['BillingState']);`
`88`	`90`	`$this->assertSame('', $data['DeliveryState']);`
`89`	`91`	`}`