Fixed test.

tests/SecurityTest.php

@@ -3,14 +3,16 @@
 class Pronamic_WP_Pay_Gateways_Sisow_SecurityTest extends WP_UnitTestCase {
 	function test_transaction_request_sha1() {
 		// http://pronamic.nl/wp-content/uploads/2013/02/sisow-rest-api-v3.2.1.pdf #page 10
-		$sha1 = Pronamic_WP_Pay_Gateways_Sisow_Client::create_transaction_sha1(
-			'123456789', // purchase_id
-			'uniqueentrance', // entrance_code
-			10, // amount
-			null, // shop_id
-			'0123456', // merchant_id
-			'b36d8259346eaddb3c03236b37ad3a1d7a67cec6' // merchant_key
-		);
+		$transaction_request = new Pronamic_WP_Pay_Gateways_Sisow_TransactionRequest();
+		$transaction_request->set_purchase_id( '123456789' );
+		$transaction_request->set_entrance_code( 'uniqueentrance' );
+		$transaction_request->amount      = 10;
+		$transaction_request->shop_id     = null;
+		$transaction_request->merchant_id = '0123456';
+
+		$merchant_key = 'b36d8259346eaddb3c03236b37ad3a1d7a67cec6';
+
+		$sha1 = $transaction_request->get_sha1( $merchant_key );
 
 		$this->assertEquals( 'cb2461bd40ed1a77a6d837a560bfcbc3e03d6c3c', $sha1 );
 	}