Using cabal test, you're able to stream results with cabal test --show-details=streaming.
I can't find a comparable option for cabal new-test. Is it possible to stream results using new-test?
I just ran into this an hour ago myself!
The --show-details flag is not yet supported by new-test: https://github.com/haskell/cabal/issues/4766
The discussion in the bug report indicate that maybe --show-details was a misfeature anyways, and it should always just stream.