SupplierPortalClient::loadSession, RefreshSupplierSessionJob, CsvReconcileJob and RouteSupplierLeadJob hardcode Cache::store('redis'), bypassing phpunit.xml's CACHE_STORE=array. Under pest --parallel every worker shares the same Memurai instance and the global supplier:session key, so one worker's afterEach forget()/flush() races another worker's mid-test loadSession() -- deterministic 1-2 failures in the tests/Feature/Supplier/ subdir-only run (quirk 72).
TestCase::setUp() repoints the redis cache store at the in-process array driver: each parallel worker gets a hermetic, worker-local cache. Production keeps the real redis driver -- the override only runs under APP_ENV=testing. New RedisCacheStoreIsolationTest guards the invariant.
Verified: tests/Feature/Supplier/ --parallel 6/6 runs 43/43 (was 42/43 +1 error); tests/Unit/Supplier/ 3/3 runs 38/38; full pest --parallel 794/791/3sk/0; Pint + Larastan clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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