The original 90b31fc8 test computed reset_at = now + 3s in the test thread,
then relied on the script spawning fast enough that the rate_limit_event
arrived while reset_at was still meaningfully in the future. Under
cargo-test load the spawn could take long enough that block_until - now
clamped to 0 and the inactivity timeout killed the script before its sleep
finished. Pin reset_at to 2099-01-01 (matching the existing
rate_limit_hard_block_sends_watcher_hard_block_event test) so the
extension is essentially infinite and the assertion isolates the
extension-vs-no-extension behavior from wall-clock slack.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Timmy
38df9c78af