John, I'm not sure I understand what you mean. In any case, Arquillian test classes are simply not in the same bucket as Java EE components.
In theory, a CDI extension could be used to add e.g. @Dependent annotation to a test class (e.g. types extending org.jboss.arquillian.testng.Arquillian or annotated with @RunWith(org.jboss.arquillian.junit.Arquillian.class)) - trimming should take this into account and hand test class over to bean discovery. Feel free to create an Arquillian issue. I'm going to reject this issue.