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Krzysztof kuhy Rudnicki
247607e8c3
The previous two fix attempts (removing -n 4 xdist parallelism, ruling
out a Python 3.12-vs-3.14 difference) both targeted the wrong cause for
the coverage gap on _alarm_display.py:71. The actual bug:
_restore_display() was never mocked in the _block_extra_devices fixture
shared by test_alarm_part2/3/4.py, so every test exercising
on_close()/_lock.close() ran the REAL _restore_display(), which calls
the REAL shutil.which('xset'). My dev machine has /usr/bin/xset
installed, so it always hit the "found" branch by accident; the CI
runner doesn't, so it always hit the "missing" branch instead, and
there was no dedicated unit test for the "found" path at all.
Fix: mock _restore_display in that fixture (matching its already-mocked
siblings _restore_fans/_restore_alarm_audio/turn_off_plug), and add a
dedicated, hermetic test for the xset-found branch that doesn't depend
on whether the running machine actually has xset on PATH. Side benefit:
the test suite no longer makes a real `xset s on` subprocess call on
the developer's desktop as an untracked side effect of running tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A7vbgtFfZmfxJtN5DdtJky
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