usb_query.py 267 -> 180. The non-blocking fd handling - _drain_buffer,
_write_with_deadline, _read_nonblocking, _wait_for_pjl_response and
pjl_query - moves to _pjl_io.py.
usb_query imports the three names test_usb_query.py patches back, which
is safe here only because all three still have real call sites in the
code that stayed; an import-only name would be stripped by ruff's F401
sweep and break the patch. os and time also stay: they are patched on
usb_query as well as on _pjl_io.
test_usb_query.py needs no edit. Pass count is 402 before and after.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
a12e696 turned CI red two ways, both missed locally because the suite was
run for the brother_printer package alone while CI runs everything in a
random order.
The repo caps Python files at 500 lines and cups_service.py had reached
659. Rather than cut it arbitrarily, extract consumable life tracking -
page counters, replacement baselines, the scale migration, dropped-page
detection - into consumables.py. The seam is real: none of it depends on
CUPS service control, and cups_service needs only estimate_consumable_life
for its fallback query, so the dependency runs one way. The test files are
split along the same seams.
test_main_entry passed or failed depending on execution order: runpy warns
when the target module is already in sys.modules, a sibling test imports
it, and pytest is configured with filterwarnings=error. Drop the module
before running it so the test no longer depends on who ran first.
Structural only; no behaviour change. 692 tests, 100% branch coverage.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RG3eEn8rwZbcXaJrKJxdv8
