Function tick_until 

pub fn tick_until<T, E>(
    pic: &PocketIc,
    max_rounds: u32,
    advance: Duration,
    poll: impl FnMut(&PocketIc) -> Poll<Result<T, E>>,
) -> Result<T, TickUntilError<E>>

Check a caller-owned predicate, advancing simulated time and ticking while pending.

The predicate runs once before any mutation. Each pending result permits one round of advance_time(advance), then tick(), then another predicate check, up to max_rounds. A zero budget still performs the initial check. A zero duration permits ticks without advancing time. Completion on the last allowed round succeeds; predicate failures return immediately without another round.

This bounds simulated progression, not wall-clock time spent inside PocketIC calls or the predicate. PocketIC operation failures retain upstream panic behavior. Applications own readiness meaning and predicate error types.