'How can i cover Junit test for an Exception's root cause?

I have the following block of code for which I want to increase code coverage:

            try{
                discountReferenceCustomerRepository.saveAllAndFlush(discountReferenceCustomersNew);
            } catch (DataIntegrityViolationException ex) {
                if(ex.getRootCause() != null && ex.getRootCause().toString().contains("Duplicate entry")){
                    LOGGER.error("{}::{}:: Attempt to persist duplicate data : [{}]", CdfConstants.CDF_CORE_SERVICE_NAME, DUPLICATE_DATA_ERROR, ex);
                    throw new SystemException("Attempt to persist one or more duplicate records ",ERROR_MSG_DUPLICATE_DATA);
                } else {
                    throw ex;
                }
            }
            return new ResponseStatusVO("Added new ORG to existing RCD for given EA");
        }

I am unable to cover the "ex.getRootCause()" section, because in my Junit test, all i do is:-

   when(repository.saveAllAndFlush(any())).thenThrow(new DataIntegrityViolationException("test"));

The root exception is SQLIntegrityConstraintViolationException with the message that says "Duplicate Entry". This error is then propagated by DataIntegrityViolationException which i can catch in my code.

Obviously, i am unable to do something like "ex.setRootCause" in my Junit coz there ain't such api defined in the library.

What can i do to increase coverage ?

exception

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'How can i cover Junit test for an Exception's root cause?

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