Yes this is possible. We converted a JBoss 4 suite of 5K+ tests from the microcontainer to JBoss 7 using Arquillian.
Add the attached jar to your project. Then go into your arquillian.xml file and add this:
<property name="deploymentClass">Name of the class that contains the @Deployment annotated method that builds your ear</property>
That should be all you need to do.
arquillianSuiteExtension.jar 9.8 KB