Micronaut Test Resources Automatic test resources provisioning for your Micronaut applications Cédric Champeau Micronaut, Oracle Labs @[email protected] @CedricChampeau Copyright © 22-11-9, Oracle and/or its affiliates Micronaut® is a registered trademark of Object Computing, Inc. Use is for referential purposes and does not imply any endorsement or affiliation with any third-party product. Unauthorized use is strictly prohibited.

- Working at Oracle Labs on Micronaut Main focus on build plugins and dev productivitity - Formerly working at Gradle Inc - Author of static compiler of Groovy - Amateur astronomer @[email protected] https://www.astrobin.com/users/melix/ https://bit.ly/3eGD0GM (Youtube) About me Copyright © 2022, Oracle and/or its affiliates micronaut.io github.com/micronaut-projects/micronaut-core

Graal Cloud Native (GCN) Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal/Restricted/Highly Restricted 3 Use Graal Cloud Native toolkit to leverage services like object-storage, monitoring, authentication, secret management, and deploy to popular cloud platforms. Graal Cloud Native lets you take full advantage of powerful cloud services without coupling to proprietary platform APIs and makes application portability possible. Graal Cloud Native supports Micronaut and Spring Boot Java Frameworks with Helidon support coming soon.

Simplified service usage eliminates the need to learn proprietary platform APIs. Advanced compile-time validation to reduce dev/test/debug cycle. Inject cloud features right into an application exactly where they are needed. Major public cloud services supported out of the box. Compile Java applications with GraalVM Native to start lightening fast, operate at peak performance immediately, and require less memory and CPU. Package into lightweight container images for even faster deployment Deploy to different cloud providers with no code changes. Support for all the major cloud platforms. Graal Cloud Native Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal 4 Easily Leverage Cloud Platform Services Multicloud by design Developer Productivity Write Microservices as Cloud-Native Applications Benefits

- Micronaut is focused on modern architectures like Serverless and Microservices - Also a complete framework for any type of application - Lightweight, reactive (HTTP Client/Server based on Netty) - Annotation processor to compute framework infrastructure at compile time Micronaut Copyright © 2022, Oracle and/or its affiliates micronaut.io github.com/micronaut-projects/micronaut-core

Micronaut computes: - All dependency & configuration injection - Annotation metadata, meta-annotations - AOP proxies - Bean introspections - And all other framework infrastructure - Reflection, runtime proxy, and dynamic classloader free Micronaut = Build Time Framework Infrastructure Copyright © 2022, Oracle and/or its affiliates micronaut.io github.com/micronaut-projects/micronaut-core

High-performance JDK distribution Increases application throughput, reduces latency, reduces memory use Graal just-in-time (JIT) compiler that runs on top of HotSpot, written in Java native-image ahead-of-time (AoT) compiler compiles Java applications into small self- contained native binaries Micronaut = Build Time Framework Infrastructure Copyright © 2022, Oracle and/or its affiliates graalvm.org github.com/graalvm/graalvm-demos oracle.com/graalvm

Micronaut + GraalVM Native Image are a match made in heaven Less work to configure Native Image because Micronaut eliminates reflection, runtime proxies, bytecode generation and dynamic classloading Startup time 20ms and Memory Consumption 18MB! Micronaut GraalVM ♥️ Copyright © 2022, Oracle and/or its affiliates graalvm.org github.com/graalvm/graalvm-demos oracle.com/graalvm ♥️

- New in Micronaut 3.6 - Simplifies setup of tests - eg. spawn a database container, a Kafka server, … - Compatible with native executables - Extensible Micronaut Test Resources Copyright © 2022, Oracle and/or its affiliates micronaut.io github.com/micronaut-projects/micronaut-core

Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal/Restricted/Highly Restricted 10

Micronaut Test Resources Copyright © 2022, Oracle and/or its affiliates Demo 1 : Micronaut Data JDBC + Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

● ./gradlew test → spawns test resources ● ./gradlew run → also spawns test resources ● ./gradlew -t test (or run) → keeps tests resources alive ● ./gradlew startTestResourcesService → test resources outlive the build ● ./gradlew nativeTest • Builds a native image which can connect to test resources service • Runs tests against the test resources Micronaut Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

Micronaut Test Resources Copyright © 2022, Oracle and/or its affiliates Demo 2 : Micronaut MQTT + Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

● Supports test resources service cross-project • Two independent “Git” repositories can share resources • Or in simpler use cases, different modules of same repository ● Supports test resources service cross-build tools! • e.g, producer built with Maven and consumer built with Gradle Micronaut Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

Micronaut Test Resources Copyright © 2022, Oracle and/or its affiliates Demo 3 : Micronaut Email + Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

● Supports conventional way to declare new resources Micronaut Test Resources test-resources: containers: fakesmtp: image-name: ghusta/fakesmtp hostnames: - smtp.host exposed-ports: - smtp.port: 25

Micronaut Test Resources Copyright © 2022, Oracle and/or its affiliates Demo 4 : Custom Test Resources micronaut.io github.com/micronaut-projects/micronaut-core

● Supports completely adhoc test resources Micronaut Test Resources public class MyTestResource implements TestResourcesResolver { public static final String MY_TEST_PROPERTY = "my.user.name"; @Override public List getResolvableProperties(Map> propertyEntries, Map testResourcesConfig) { return Collections.singletonList(MY_TEST_PROPERTY); } @Override public Optional resolve(String propertyName, Map properties, Map testResourcesConfiguration) { if (MY_TEST_PROPERTY.equals(propertyName)) { return Optional.of("world"); } return Optional.empty(); } }

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● Supports both JDBC and R2DBC • PostgreSQL • MySQL/MariaDB • Oracle XE • Microsoft SQL Server ● Container based resources • Elasticsearch • Kafka • MongoDB • MQTT (HiveMQ, RabbitMQ) • Neo4J • Redis • Hashicorp Vault Micronaut Test Resources : conclusion

● Generic Testcontainers support • Expose your own container via conventional properties • Allows mounting local files, etc. ● Generic test resources support • Implement your own! ● Compatible with native images • Isolates your application code from test resources • Native binary connects to remote service Micronaut Test Resources : conclusion

● Micronaut Launch : https://micronaut.io/launch ● Micronaut Project: https://micronaut.io/ ● Micronaut Test Resources: https://github.com/micronaut-projects/micronaut-test-resources Slides coming @[email protected] Micronaut Test Resources : resources

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