Take Control of your Integration Testing with Testcontainers
summary
Shows concrete failures caught when switching from H2 vs MySQL mismatch (empty IN clause rejected by MySQL) to running a real MySQL instance inside tests via Testcontainers MySQL container. Demonstrates Gradle/Spock setup, automatic Docker pull and lifecycle control, and replacing manual localstack setup for S3 with a LocalStack container to create/read buckets. Gives code-level notes on driver URLs, a generic container option for custom images, and confirms tests run and reproduce production behavior.
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