Introduction
When building applications that process data streams, you need to test how your stream processing logic works before running it live. Testing stream topologies helps you check if your data flows and transformations behave correctly.
When you want to verify that your Kafka Streams application processes input data correctly before deployment
When you need to simulate input and output topics to check your stream transformations
When you want to catch bugs early by running automated tests on your stream processing logic
When you want to test complex data flows involving joins, filters, and aggregations in your stream
When you want to ensure your stream topology handles edge cases and error scenarios properly