String header = MuleCredentials.createHeader("marie", "marie", "PBE", strategy);
Map<String, Object> props = new HashMap<String, Object>();
props.put(MuleProperties.MULE_USER_PROPERTY, header);
client.dispatch("vm://test", "Marie", props);
MuleMessage m = client.request("vm://output", 3000);
assertNotNull(m);
assertEquals(m.getPayload(), "Marie");
}