Mastering Integration Tests with Testcontainers.
summary
Shows how to run reliable integration tests by wiring Testcontainers with Docker into Spring via a static DynamicPropertySource, starting Redis, Postgres and Kafka containers, copying schema SQL into the DB image, and mapping randomized host ports. Demonstrates reusable containers to avoid repeated startups, ties container lifecycle to JUnit, and injects a toxiproxy to add latency; tests run end-to-end, pass against the real services, and cleanup (or persist) containers as configured.
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