Add unit tests for osism/tasks/netbox.py

[berendt]

Adds tests/unit/tasks/test_netbox.py covering the Celery tasks of the netbox worker as specified in #2355:

• _update_netbox_device_field: happy path (custom-field update + save), device not found, all four requests exception handlers (ConnectTimeout, ReadTimeout, ConnectionError, HTTPError), errors raised by device.save(), and the semaphore being created from nb.base_url and entered/exited around the API call.
• _matches_netbox_filter: empty filter, primary filter variants (case-insensitive, substring), URL/name/site matching, missing netbox_name/netbox_site attributes, and the no-match fall-through.
• set_maintenance / set_provision_state / set_power_state: one parametrised body over the three tasks (same approach as QUERY_LIST_VARIANTS in the conductor tests) covering Redlock key/timeouts, unacquired lock, failed update still returning True, filter-based primary/secondary skipping, the utils.secondary_nb_list fallback, lock release on exceptions, the set_power_state None → "n/a" conversion, and task-lock abort before Redlock creation.
• get_location_id / get_rack_id (parametrised): found, missing, and ValueError from ambiguous matches.
• The four pass-through get_* tasks: delegation to the expected pynetbox endpoints.
• manage: exact netbox-manager environment with str()-coerced settings, argument/keyword forwarding to run_command, return value pass-through, and no command execution when tasks are locked.
• ping and setup_periodic_tasks.

utils.nb and utils.secondary_nb_list are lazy attributes resolved via osism.utils.__getattr__; they are always patched with create=True so no real NetBox connection is ever opened. All tasks are invoked directly — Celery binds self on direct calls, so no broker is needed.

Closes #2355

[sourcery-ai]

Hey - I've left some high level feedback:

• In the _update_netbox_device_field tests (e.g. test_update_field_updates_and_saves and the request‑error tests), the nb MagicMock doesn’t have a base_url attribute even though the implementation calls create_netbox_semaphore(nb.base_url); consider reusing the mock_nb fixture or explicitly setting base_url there to avoid brittle tests if the code starts relying on it more strictly.
• The semaphore behavior in _update_netbox_device_field is only asserted for the happy path; it may be worth adding a case where the NetBox call raises to confirm the semaphore context manager is exited correctly even on exceptions.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In the `_update_netbox_device_field` tests (e.g. `test_update_field_updates_and_saves` and the request‑error tests), the `nb` MagicMock doesn’t have a `base_url` attribute even though the implementation calls `create_netbox_semaphore(nb.base_url)`; consider reusing the `mock_nb` fixture or explicitly setting `base_url` there to avoid brittle tests if the code starts relying on it more strictly.
- The semaphore behavior in `_update_netbox_device_field` is only asserted for the happy path; it may be worth adding a case where the NetBox call raises to confirm the semaphore context manager is exited correctly even on exceptions.

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[ideaship]

This assertion pins a broken pynetbox path. The production task at osism/tasks/netbox.py:380 calls utils.nb.dcim.addresses.filter(...), but pynetbox exposes IP addresses under ipam.ip_addresses, not dcim.addresses — see osism/tasks/conductor/netbox.py:122,177 in this same repo, which use utils.nb.ipam.ip_addresses.filter(...). Against a real NetBox this 404s; the full MagicMock hides that. Don't land a test that certifies the wrong endpoint: fix the production line to ipam.ip_addresses in a separate commit, then assert the corrected path here. (The device=/interface= filter keys are valid on that endpoint — both filter by name — so only the app/endpoint changes.)

[ideaship]

"primary-dc" in this parametrize list cements a production bug. In _matches_netbox_filter (osism/tasks/netbox.py:83) the primary branch is "primary" in filter_lower — reversed from every other check, which does filter_lower in <field>. As a result any filter containing the substring "primary" (e.g. a secondary at site primary-region) also selects the primary and updates it unintentionally. Don't assert "primary-dc" matches here. Correct the production line (exact-keyword match, or filter_lower in "primary") in a separate commit, then update the test to match.

[ideaship]

This asserts result is True when the update failed, which cements a contract bug: all three set_* tasks fall through to return True (osism/tasks/netbox.py:183) even though _update_netbox_device_field returned False (lines 148-153 only log). The docstring — "True if lock was acquired and operation succeeded" (line 132) — establishes the intended contract, so this is a bug, not an ambiguity: a caller (e.g. conductor/ironic.py:1099) can't distinguish success from a silently-failed update. Fix the production code in a separate commit to aggregate update failures into a False return, and change this test to assert False on the failure path as part of that same fix. If the production change isn't happening here, drop this test rather than land one asserting True.