Removing complexity from integration tests using Testcontainers!
summary
Demonstrates using Testcontainers (Java, with language ports for Go/Python/Node/Rust) to run real PostgreSQL and Kafka instances inside Docker for integration tests, showing dynamic port binding, built-in wait strategies, and a reuse mode to avoid repeated 30s Oracle startups; Kafka boots in ~10s in the demo. Tests start/stop containers automatically, expose JDBC URLs and credentials, avoid port collisions, and clean up zombies. Testcontainers Cloud is used as a remote Docker backend.
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