lib/Foo/Bar.pm
lib/Foo/Bar/Baz.pm
lib/Blah/Bleh.pm

##</code><code>##

lib/t/Foo/Bar.t
lib/t/Foo/Bar/Baz.t
...

##</code><code>##

lib/Foo/Bar/t/Bar.t
lib/Foo/Bar/Baz/t/Baz.t
...