Hi 

I am working on writing unit tests for jcl-over-slf4j module. 

I have started with some simple unit tests like: 

1. Testing attribute set/get and removals for SLF4JLogFactory
   
2. Testing the delegation of calls for SLF4JLocationAwareLog and SLF4JLog.

I noticed that there are two classes SimpleLog and NoOpLog which are nowhere used. I would appreciate if some one can help me understand the utility of these two classes. 

Would it be useful if I write unit tests for these classes?

Thank you

Farid