Respuesta :

The new black codes allowed the blacks to do five things:
- marry by law
- swear out affidavits in criminal cases
- go to school 
- testify as witnesses during a trial
- sue or be sued in civil courts

The answer to your question is 
testify as witnesses during a trial. I hope this is the answer that you were looking for. 

Answer:

testify as witnesses during a trial, but only in court cases involving other blacks

Explanation: