tests/__init__.py keeps a run offline, its scratch under tmp/ and its
installer cache its own, but only discover -s tests -t . imported it.
discover tests ran with RETROBIOS_OFFLINE unset, scratch on the /tmp
tmpfs and the user's real installer cache, the setting in which e2e
fixtures had written into the shared .cache/large. Every test module now
imports the package first, and a test fails on a module that does not.
test_verify_listing.py took its line with the previous commit.
A platform entry that resolves only through a data directory tree read as missing with no cause on a checkout where data/ was never refreshed, while an online pack build refreshes the trees and packs it. verify_platform now reports the uncached trees and prints them when files are missing.
Abdessamad Derraz