odoo/upgrade-util#324

Created by Upgrade, Alvaro Fuentes Suarez (afu)

Blocked

label
odoo-dev:master-doc_upgrade_tests-afu
head
92a431a93002a9a84f9d9563df6e18299f8c4526
odoo/upgrade-util
master #324 missing r+

[IMP] tests: document testing framework

Add details about the test classes for upgrades.

See: odoo/documentation#14649, the patch here should be merged first.