Make the testing output more verbose

[1ethanhansen]

    Non-blocking question: Can we make the output more verbose? 

The CI logs contain only the output from line 33:

Checking hello_world exercise...
Checking leap exercise...
Checking reverse_string exercise...
Checking space_age exercise...

So it's not fully reassuring that the every test case does actually run. It would be nice to not just rely on the exit code.

Originally posted by @ee7 in #10 (comment)

[1ethanhansen]

Might be able to use something like v test . for this?