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.
EmuELEC's ports system has one emulator, `ports`, the dispatch to a
script ports.yaml generates. The scraper now reads each port's engine
(the libretro core handed to emuelecRunEmu.sh with -C, else port_exe),
so devilutionx, sonic2013, soniccd, sonic-mania, reminiscence and
rigelengine are examined. Standalone emulators keep the spelling the
launch code dispatches on instead of invented lowercase forms, and
media players and runtimes go to the overrides' remove_cores.
Each system of the AmberELEC, EmuELEC and KNULLI lists now carries the
cores its ES list offers it, in menu order, under `cores:`.
Each OS publishes Batocera's systems dict (knulli-systems, and
batocera-systems at AmberELEC's newest prerelease commit and EmuELEC v4.8),
read with the shared parser. Cores come from each OS's own ES list.
AmberELEC and EmuELEC declare neogeo/ and ports/ beside bios/ from
/storage/roms, so their packs extract there and core_destination puts
core files under bios/.