Redis - HelpMeTest

Redis

Redis Pub/Sub and Streams Testing Patterns

Redis Pub/Sub and Redis Streams are fundamentally different messaging primitives, and each requires distinct testing approaches. Pub/Sub is ephemeral—messages are lost if no subscriber is connected. Streams are persistent—messages are stored until explicitly deleted. This guide shows how to test both reliably. Redis Pub/Sub Testing

Redis

redis-mock vs Testcontainers for Redis Testing: When to Use Each

Testing code that depends on Redis presents a fundamental choice: simulate Redis in-process with a mock library, or spin up a real Redis instance via Testcontainers. Both approaches have distinct trade-offs that affect test speed, reliability, and the bugs you catch. This guide walks through both options in

Redis

Redis Cluster and Failover Testing: Patterns for Production Resilience

Redis Cluster is the native horizontal scaling solution for Redis. It partitions data across multiple nodes using consistent hashing (16384 slots), with each node responsible for a subset. When a primary fails, a replica is promoted. This guide covers how to test cluster behavior—slot assignment, redirects, failover, and reconnection—

Redis

Cache Invalidation Testing Strategies: Patterns and Anti-Patterns

Phil Karlton famously said there are only two hard things in computer science: cache invalidation and naming things. Testing cache invalidation is hard for different reasons—the behavior is time-dependent, state-dependent, and often involves distributed components that are difficult to simulate in isolation. This guide covers the major

Testing

BullMQ Advanced Testing: Flow Producers, Delayed Jobs, and Rate Limiters

BullMQ's advanced features — flow producers, delayed jobs, rate limiters, and job groups — enable sophisticated background processing patterns. But these features are also the hardest to test correctly. This guide covers testing strategies for each advanced BullMQ pattern, building on basic queue testing to handle the complex orchestration scenarios

Testing

Redis Streams Testing: Consumer Groups, Pending Entries, and Testcontainers

Redis Streams differ from simple pub/sub — they persist messages and track consumer group acknowledgments via the Pending Entries List (PEL). Testing consumer groups means verifying XACK behavior, idle consumer claim logic, and re-delivery after consumer failure. Testcontainers provides a real Redis instance; Python's redis-py gives

Database Testing

Redis Testing Guide: Unit and Integration Testing with fakeredis and ioredis-mock

Redis powers some of the fastest parts of modern applications — caches, session stores, queues, leaderboards. But testing Redis-backed code is often skipped or done poorly, leading to bugs that only show up in production. This guide covers unit testing with fakes, integration testing with real Redis, and patterns that