What is the clean way to use Devel::Cover on multiple test files?

[tuxayo]

Not to run the whole suite, but just to run individual files and a directory

Is this a decent way to proceed? PERL5OPT=-MDevel::Cover prove t/MyTest.t t/MyTestDir
It works but there is no output from Devel::Cover so I miss messages like #342

I found this:
https://stackoverflow.com/questions/11212425/how-to-use-develcover-with-prove

cover -t -make 'prove -Ilib -r t/MyTest.t t/MyTestDir ; exit $?'
Same as the 1st attempt. Works, but silences output of Devel::Cover

prove --exec 'perl -MDevel::Cover -Ilib' t/MyTest.t t/MyTestDir
It works but I have duplicate warnings (e.g. of #342) for each test file. Maybe that's normal?

Here, using a makefile doesn't really fit because it's to review patches and each time I'm running the few relevant test files/directories. To avoid running the whole huge test suite. And it's really great to have a tool as powerful as Devel::Cover to easily check that the new tests are enough to cover the new code :D

So I'm trying to be sure to use the tool right and not cause unintended bad effects.