The sample unit-testing works with Struts2.3.16 http://struts.apache.org/development/2.x/docs/unit-testing.html and https://svn.apache.org/repos/asf/struts/sandbox/trunk/struts2examples/unit_testing/
But without running RegisterTest.java I don't how I can run this "RegisterTest extends StrutsTestCase" I added junit-plugin, spring jar and JUnit lib All is ok in Netbenas 7.3 and Tomcat 6
