Perl test coverage

Select files to cover and run the tests, capturing coverage data:

perl -MDevel::Cover=,+ignore,.*,-select,^lib t/path/to/test.t

Meaning:

• ignore all paths...
• except ones starting with "lib"

After it's run, at the command prompt, type this to generate the HTML report:
cover

And then open this file in your web browser:
cover_db/coverage.html

(docs)