callUri("", HttpHeaders.ACCEPT, HttpContentType.APPLICATION_XML + "; charset=iso-latin-1",
HttpStatusCodes.NOT_ACCEPTABLE);
final String body = getBody(response);
Map<String, String> prefixMap = new HashMap<String, String>();
prefixMap.put("a", Edm.NAMESPACE_M_2007_08);
XMLUnit.setXpathNamespaceContext(new SimpleNamespaceContext(prefixMap));
assertXpathExists("/a:error", body);
assertXpathExists("/a:error/a:code", body);
assertXpathExists("/a:error/a:message", body);
}