Embeded arquillian-container-jetty doesn't expose property for setting "extractWAR". Unfortunately it seems not possible to deploy WAR with some WEB-INF/lib jars and having this property set to false. I tried to deploy weld-numbergues.war (containing library jars of course) and I got similar problems/exceptions as in:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=284466
https://bugs.eclipse.org/bugs/show_bug.cgi?id=395155
So we can probably test this only with Tomcat.