apache deltaspike v0.6+ provides an easy to use, but quite powerful junit test-runner. it's based on the container-control api of deltaspike. deltaspike itself currently provides implementations for openwebeans, weld and openejb (tomee).
the last one is important, if you need to test a cdi+ejb based application.
just by using a different container-control implementation (deltaspike-cdictrl-openejb) in your build config and adding openejb (/tomee) via org.apache.openejb:openejb-core, you can test cdi-beans as well as ejbs. just inject them as usual via @Inject (also @EJB works as expected).
an example can be found here.