final SolrCore core = context.getSolrCore();
final StreamSource xsltSource;
if (core != null) {
final ResourceLoader loader = core.getResourceLoader();
transFact.setURIResolver(new SystemIdResolver(loader).asURIResolver());
xsltSource = new StreamSource(loader.openResource(xslt),
SystemIdResolver.createSystemIdFromResourceName(xslt));
} else {
// fallback for tests
xsltSource = new StreamSource(xslt);
}