"run" and "runParallel" customize TestPrinters.Default and use it to print outputs for failed and exceptions. It would be nice to provide a way to either customize TestPrinters.Default or allow run/runParallel take custom TestPrinters.

My goal is to have verbose printing and print information about passed tests.

It would also be nice to somehow print progress. Perhaps pass to BeforeRun # of test about to be run / # of tests total?