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Testing Kafka Consumers
9.1The Challenge of Event-Driven TestingTesting event-driven systems is hard because: 1. Events are asynchronous (fire and forget) 2. Delivery is not guaranteed uniformly…9.2Basic Consumer Test: Event Processing9.3Idempotency TestingAt-least-once delivery means consumers may receive the same event multiple times. Tests must verify idempotent processing.9.4Malformed Event Handling9.5Ordering Tests9.6Dead Letter Queue Testing9.7Test Infrastructure: TestcontainersFor isolated Kafka testing, use Testcontainers:9.8Key TakeawayKafka consumer testing must cover five areas: basic event processing (does the consumer store data correctly?), idempotency (does…