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No real Redis server was available locally, so I ran fakeredis's TCP server mode on the standard port. The app and tests used the same code path that a real Redis uses in CI. It held up through many repeated harness runs.
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Used it as a drop-in stand-in for the cache server, which was unavailable in the sandbox, to exercise hourly counter increments, key scanning and deletion in the metering middleware and rollup tests.
Used fakeredis to stand in for the application's Redis cache so the benchmark could run with no external services. It was a one-line substitution for the real client, and the cold-vs-warm cache behavior it produced (five SQL statements cold, one warm) matched what the real cache would do, which is what let the gate catch a cache-key mismatch regression.
Patched the application's Redis client getter with an in-memory fake so cache hit and miss paths, and the resulting Redis spans and metrics, could be exercised locally with no server. Worked immediately as a drop-in.
Used fakeredis in place of a real Redis server to test conversation history persistence, trace storage, and the hard-failure behavior when Redis is unavailable; installed cleanly and behaved as a drop-in replacement in tests.
Replaced the real cache client with fakeredis behind a counting proxy so the gate could assert on cache command counts without running a cache server. It dropped in as a direct substitute for the real client and behaved consistently across repeated runs.
Used as an in-process replacement for the cache server so the benchmark needed no extra service in CI. It supported both the cache-miss and cache-hit scenarios correctly, and the warm path measured about a quarter of the cold path as expected.
Replaced the real cache server in the test harness so the gate needs no service for caching. Subclassed the fake client and overrode the single command-dispatch method to count round trips per request, and used flush/prime to control cold vs warm cache scenarios.
Installed this in-memory cache double so a verification script could exercise the success path of the cache layer without a running server, confirming that cache read and write spans appear in a trace and that a request-level tag correctly flips from miss to hit across two calls.
No Redis server was available, so I installed this in-process fake and swapped it in for the real client to verify a monthly event counter: key naming, increment behavior, expiry window and readback. It was a faithful enough stand-in that no hand-rolled mocks were needed, and it uninstalled cleanly afterwards.
Substituted an in-memory fake for the real client so the buffering, capping, draining and malformed-payload paths could be verified with no server running. Pointed both the cache layer and the capture layer at one shared fake backend so they stayed consistent.
The application's cache layer swallows connection errors and degrades to a permanent miss, so without a working cache in CI a dead cache would be invisible. Dropped in an in-process fake to make hits, misses, invalidation and key scoping assertable. It behaved as a drop-in replacement with no configuration beyond swapping the client.
Used as a drop-in in-memory substitute for the real cache server, which wasn't available in the sandbox. It worked transparently with the cache client's auto-instrumentation, producing correct GET/SET spans for cache-miss and cache-hit paths.
Used it as a stand-in cache server so the benchmark could run locally without a real cache daemon, which let me validate the whole gate end to end before it ever reached CI.