Check for proper setup of test cases

[guhilling]

Is your feature request related to a problem? Please describe.
The only supported cdi feature for test cases is field injection. This should be verified during test setup.
Also some other things like test class visibility etc. could be checked.
Right now things might "silently" go wrong although throwing an exception or at least issuing a warning should be not problem.

Describe the solution you'd like
Create a verifier for all of the test classes.

Describe alternatives you've considered
None.

Additional context
None