Removing complexity from integration tests using Testcontainers!
summary
Claim: Testcontainers replaces brittle mocks by launching real throwaway services for integration tests, demonstrated with a Spring Boot “ratings” microservice that uses PostgreSQL 14, Kafka container and Redis generic container, all started in parallel with randomized ports. Code shows H2 failing on Postgres-specific SQL, adding testcontainers-postgresql fixes it, tests run and pass, containers auto-clean. Also shows static containers to reuse across tests and testcontainers.cloud to run Docker-less CI.
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