X_TEST_REAL_SLEEP

a test waits for the wall clock — Bun.sleep(n), setTimeout(…, n > 1), setInterval — with no // real-clock: reason

every run of the suite pays the wait, and a loaded runner turns "long enough" into a race; @ultimat3/testing says "No wall clock" and in tests it was prose — 355 sites under a green gate. A ratchet per package (scripts/lib/test-real-sleep-pins.ts): the count may fall and may never rise. An event-loop turn (setTimeout(…, 0), setImmediate) is not a wait

move time instead: jest.useFakeTimers() + jest.advanceTimersByTime(ms) for the timers the subject arms, advanceClock / the clock fixture for Date.now(), or await the event; another process's time only with // real-clock: <why> on the line or the line above