/**
  * Test that fetchMessageByGatewayOrderId returns null when the message
  * isn't found.
  */
 public function testFetchMessageByGatewayOrderIdNone()
 {
     $message = $this->generateTestMessage();
     $this->db->storeMessage($message);
     $fetched = $this->db->fetchMessageByGatewayOrderId('test_gateway', $message['order_id'] + 1);
     $this->assertNull($fetched, 'Record correctly not found fetchMessageByGatewayOrderId.');
 }