Ok, but how could we alternatively test injection via at `@Resource` then (assertion 10.2 b): 

> Instead of looking the instances up via JNDI, the user can request them to be injected via the Resource annotation: @Resource ValidatorFactory validatorFactory; @Resource Validator validator;

As said it doesn't seem to work directly within the Arquillian test class. Using an EJB was the simplest thing I've found.