Testcontainers made easy

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Testcontainers made easy Álvaro Sánchez-Mariscal Principal Member of Technical Staff Oracle @alvaro_sanchez

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Copyright © 2024, Oracle and/or its affiliates 2 About me • Coming from Madrid • Developer since 2001 (Java stack) • Micronaut core developer since its inception (2017). • Author: Maven Plugin, Object Storage, Kubernetes, Cache, Control Panel. • Others: Core, Gradle, AWS, GCP, Azure, Security, Test, etc. • Currently at Oracle Labs: • Micronaut and Graal Development Kit for Micronaut (GDK). • GraalVM Native Build Tools. @alvaro_sanchez

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@alvaro_sanchez Copyright © 2024, Oracle and/or its affiliates 10 Testcontainers • Library for managing Docker containers to wrap real services for integration testing. • Supports multiple languages. • Testcontainers-Java: • Integrates with Junit and Spock. • First-class support from Spring, Quarkus and Micronaut.

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@alvaro_sanchez Copyright © 2024, Oracle and/or its affiliates 12 Testcontainers features • Manages the container lifecycle. • Allows networking configuration. • Can execute commands inside the started container. • Is able to copy files to containers. • Can create images on-the-fly (from a Dockerfile or using Jib). • Handles reusable containers.

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Introduction to Micronaut Copyright © 2024, Oracle and/or its affiliates 16 Micronaut is a complete solution for any type of application: microservices, message-driven producers or consumers, command-line apps, serverless functions, etc. All application types Micronaut leverages Java annotation processors and other optimisations to compute the framework infrastructure at compile-time, drastically reducing startup time and memory consumption. Highly optimised Modern, open-source Java Framework Micronaut has been designed from scratch in 2017, focused on modern architectures like microservices and serverless, and with the cloud in mind.

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Micronaut computes at build time: • All dependency and configuration injection. • Annotation metadata (meta annotations) • AOP proxies. • Bean introspections. • All other framework infrastructure. At runtime: • No reflection. • No proxy generation. • No dynamic classloading. • No classpath scanning. AOT: Ahead Of Time Copyright © 2024, Oracle and/or its affiliates 17 Source code @Singleton class MySvc {} Bytecode class $MySvc$Definition {} class $MySvc$Definition$Reference {} Source code @Builder record Person() {} Source code @Generated class PersonBuilder() {} compilation compilation

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@alvaro_sanchez Copyright © 2024, Oracle and/or its affiliates 18 Micronaut Test Resources • Automatic provisioning of external resources needed during development or testing. • Built-in support: • Integrated with JUnit Platform (JUnit / Spock / Kotest) for zero-configuration Testcontainers. • MariaDB • MySQL • Oracle • PostgreSQL • SQL Server • Elasticsearch • Redis • MongoDB • Neo4j • Hashicorp Vault • Kafka • RabbitMQ • MQTT • Localstack • Anything else Testcontainers supports