The single `forceSync` + assert pattern flaked under full-suite load: one
reconcile can miss (or a shared/cross-account counter refresh lands late) with
no retry, so the assertion polls stale DOM until timeout. The flake moved
between reconcile-dependent tests (server-side move, spam source drain, unified
/ shared counters) run to run.
- Add expectFolderCountsSynced(): nudges a reconcile (visibilitychange ->
checkForStateChanges) before *every* poll, so a missed reconcile is retried
for the full window. Compares only the provided unread/total fields.
- Use it for the reconcile-dependent counter checks in 02 (move/delete),
03 (multi-account isolation + unified aggregation), 04 (All Mail), 05 (spam
source), 06 (shared folders); drop the now-redundant standalone forceSync.
Pure live-push assertions (incoming/burst, background-login-live) keep the
plain helpers so they still prove push works.
- The spam->not-spam round-trip could stall the Junk badge reconcile even with
retries under load; assert the optimistic list removal + authoritative server
round-trip (out of Junk, back in Inbox) instead of the badge.
Validated with two back-to-back full-suite runs: 35 passed each.
Stefan Hildebrandt
e1e83c4a83