test_timeout_kills_the_whole_process_group asserted that `pgrep -f 'sleep 300'`
returns nothing. That is machine-global: it matches a leftover from an earlier run of
the same test, any unrelated 'sleep 300' on the box, and the shell running pgrep,
whose own command line contains the pattern being searched for.
Observed three spurious matches on a dev box, which produced a red run that looked
like a Python 3.14 regression in the helm timeout kill. It was not — the same test
failed identically on 3.12. A test that fails for reasons unrelated to the code is as
useless as one that cannot fail.
The sleep duration is now derived from the pid, so it cannot collide with another run,
and the test asserts up front that its own pattern matches nothing before it starts.
Verified: 3 consecutive passes on each of Python 3.12 and 3.14.
Nguyen Minh Phuc