57/57 lines, measured through run_all.sh and confirmed a second time at
--min 100 so a shortfall would exit non-zero. check_shell_coverage.sh
passes with the exemption removed.
28 assertions over 14 cases: no cpufreq at all, every core already
tuned, the mixed case where only some cores lag, cpupower absent /
unconfigured / already configured, and all three I/O scheduler targets
(none for NVMe, mq-deadline for SATA SSD, bfq for spinning disks).
The sysfs reads and the two /etc write targets are now behind overrides
defaulting to the real paths, so the tests can present hardware this
host does not have -- a rotational disk -- without touching anything.
One assertion initially passed for the wrong reason: _t_hide keeps
$FAKE_BIN on PATH by design, so the harness's own cpupower stub still
satisfied has_cmd and the "not installed" branch never ran. Unstubbing
before hiding is now explicit, and the case fails if that is lost.
This also settles arch_sysctl.sh's diagnosis: it uses this same
harness, so the harness is not why it cannot be measured.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
