at http://www.jboss.org/jsfunit/gettingstarted.html page you have error in section "Package these jars in your WEB-INF/lib".
The JAR htmlunit-core-js-2.4.jar points to older version http://repo1.maven.org/maven2/net/sourceforge/htmlunit/htmlunit-core-js/2.2/htmlunit-core-js-2.2.jar
Fortunately uncle Google knows brisk answer (http://www.nabble.com/Cannot-load-page-td20789547.html)...
But is rather depressive for nives that your helojsfJEE5 deployed in Geronimo runs correctly and my first own experiment isn't...'-)
Thanks for letting me know a out that. It's fixed now.