How to run test suite: in development or production mode?

I have some tests.

When I run them in development mode, then some functionality is disabled.
When I run them in production mode, then I miss some debugging info when test fail.

I feel I need some hybrid mode: which run with all functionality enabled and verbose debugging info. But I do not find any info about this practice.

So how to run test suite: in development or production mode?
or, probably, how to implement hybrid mode?