testify makes most bog-standard test checks much easier to read and
maintain, and is quite widely used. It wasn't really well known back
when go-mtree was first written, but the migration is fairly
straight-forward for most tests.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
For the most part, all the keywords for a standard mtree spec now have a
function to produce the contents for a creator.
These are used in the "walk" function, and will be used next in the
"check" logic.
This is still a WIP, as the DirectoryHierarchy produced from the current
Walk() is not all-together a valid document.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
