Fix the test suite

[joelhaasnoot]

The suite has not run in a long time. Test discovery itself was broken: openebs/tests/__init__.py and kv1/tests/__init__.py imported their modules by hand through loader.find_module(...).load_module(...), and Python 3.12 removed find_module — so the whole suite died at import and zero tests ran. Django has discovered test*.py on its own since 1.6, so the initialisers can simply be empty.

With discovery working, 24 of 36 tests failed. 40 tests now run and pass.

Five real bugs the tests could not report

Where	Bug
openebs/models.py:345	Kv15Scenario.delete_all() filtered on messageendtime__gt=now — the function, never called. Deleting a planned scenario raised TypeError.
ferry/.../sendkv6.py:49,69	msg.delay > 0 on a nullable field, so a ferry message without a delay crashed the command. The init branch at line 32 already guarded for None; two of three places forgot.
utils/views.py:88	get_pushers() raised ImproperlyConfigured when any subscriber lacked the message type, and ndovloket_rig has no KV6 endpoint — so Kv6PushMixin could not even be imported. Now skips subscribers that do not take the type.
templates/xml/kv17journey.xml:50	mutation > 0 or shorten > 0 and not is_recovered — and binds tighter than or, so the not is_recovered guard never applied to mutation messages and a recover still emitted a mutation-message block.
.../verify_messages.py:99	KV8 deletes were matched with get_or_create() on the KV8 identity, but updating a message leaves the superseded version behind carrying that same identity, so the lookup raised MultipleObjectsReturned. Now matches the most recent one.

The last two change what goes out to subscribers, so they deserve a careful look. For the KV17 one the expected-output fixture already documented the intended behaviour (no mutation block on recover), which is what convinced me the precedence was accidental.

The rest is fixture rot

Tests written against behaviour that has since moved on:

• stops are matched by QuayCode now, not timingpointcode, and message identity moved to OriginalMessageCode* — the KV8 rows in test_command_verify predate both
• mutation messages moved to their own Kv17MutationMessage model; the tests still built Kv17StopChange(type=5), which no longer feeds the template
• KV17 cancels gained showcancelledtrip and autorecover (Features showcancelled & autorecover #214) — added to the expected XML
• import_rid reads bison_id and quaycoderef; the test CSV still used operator_id and omitted the quay column
• SUBREASONTYPE gained an entry, so SUBREASONTYPE[1][0] no longer matched the literal in the expected XML — pinned to the literal instead
• assertEquals and unittest.test are gone in Python 3.12

Testing

manage.py test → 40 tests, OK, run twice. Also re-ran the app smoke checks afterwards, since this touches the KV17 template and three commands: login plus /bericht, /kaart, /haltes.geojson, /stop/search.json, /scenario, /ritaanpassing and /admin/ all still return 200.

🤖 Generated with Claude Code