// we do not supply "http://etherx.jabber.org/streams"
StanzaBuilder stanzaBuilder = new StanzaBuilder("stream")
.addNamespaceAttribute(NamespaceURIs.JABBER_CLIENT)
.addAttribute(NamespaceURIs.XML, "lang", "en_UK")
.addAttribute("version", XMPPVersion.VERSION_1_0.toString());
protocolWorker.processStanza(sessionContext.getServerRuntimeContext(), sessionContext, stanzaBuilder.build(), sessionStateHolder);
Stanza response = sessionContext.getNextRecordedResponse();
XMLElementVerifier responseVerifier = response.getVerifier();
assertTrue(responseVerifier.nameEquals("error"));
assertTrue("error", responseVerifier.subElementPresent(StreamErrorCondition.INVALID_NAMESPACE.value()));