The suite intermittently failed "settingsSync ... SESSION_SECRET_FILE" under
full parallel load (passed in isolation). Two causes:
- env vars were mutated directly on the shared process.env, so other test
files in the same worker could leak in. Use vi.stubEnv + unstubAllEnvs so
each test's env is isolated and auto-restored, and stub the managed vars to
undefined in beforeEach for a clean baseline.
- both SESSION_SECRET_FILE tests wrote a shared relative ./session-secret and
removed it with a fire-and-forget async unlink; under load the pending
unlink from the first test fired during the second (after write, before
read), so the file was missing. Use a unique temp file per test, removed
synchronously in afterEach.
Verified: 17/17, stable across repeated runs and with hostile env
(APP_NAME/SETTINGS_SYNC_ENABLED/SESSION_SECRET) set in the real environment.
Stefan Hildebrandt
5fc32c4e89