`Success: All tests passed` even when 0 tests; maybe show number of tests? (or that no tests were run)
eg: 
git clone https://github.com/idlewan/nim-fswatch
cd nim-fswatch
nimble test
Success: All tests passed

is a bit misleading (or at least not informative) since no tests were run in the 1st place; this gives a false impression a package is working properly; in other cases there could be tests written but nimble isnt' aware of it (eg due to misconfiguration), and informing user that not tests were run would help catch such bugs.

indicating the number of tests passed (0 here) would be ideal; or at least showing "no tests found"
