@Test public void invoice_can_be_converted_to_ubl() throws IOException { byte[] xml = IOUtils.getResourceAsByteArray(RESOURCES_PATH + "/" + TEST_UBL_FILE_NAME); assertNotNull(xml); Invoice invoice = documentService.convertToInvoice(xml); assertNotNull(invoice); assertNotNull(invoice.getContent()); byte[] convertedXml = documentService.convertToXml(invoice); assertNotNull(convertedXml); }