000_basics/
            001_cpan-prerequisites.t
            002_database-bootstrap.t
            ...
100_orm/
            101_dbix-main-schema.t
            102_dbix-main-foo.t
            ...
200_main-classes/
            201_My-Special-Foo.t
            202_My-Class-Accessor-Lightspeed.t
            ...
300_parsing/
            301_xml-to-spaghetti.t
            302_unmelt-ice-cream.t
            ...