Almost there, I receive this exception:
org.jboss.arquillian.warp.impl.client.execution.WarpSynchronizationException: The Warp failed to observe requests or match them with response.
There were no requests matched by observer [null]
If Warp enriched a wrong request, use observe(...) method to select appropriate request which should be enriched instead.
Otherwise check the server-side log and enable Arquillian debugging mode on both, test and server VM by passing -Darquillian.debug=true.
Do you think it may me something related with TomEE? I mean do I need to set an observer as mandatory?