Wraps Redis cache testing: EXPIRE / PEXPIRE / TTL verification (Redis 7+ NX/XX/GT/LT flags), cache-aside write-then-invalidate (write source → DEL key → assert fresh read), eviction under memory pressure (maxmemory + allkeys-lru), pub/sub invalidation across nodes, and tenant key-namespacing. Use when Redis is the app's primary cache. For a Memcached app-tier store use memcached-tests; for the browser/HTTP tier use browser-cache-control-tests; a runnable test, not the cache-stampede-reference or cache-coherence-patterns-reference catalogs.