A presentation at Devoxx Poland in in Kraków, Poland by Oleg Šelajev
Say it works on my machine one more time… I dare you! Oleg Šelajev
What actually drives productivity?
What actually drives productivity? The developer-centric approach to measuring and improving productivity. Abi Noda, DX Margaret-Anne Storey, University of Victoria Nicole Forsgren, Microsoft Research Michaela Greiler, DX / / https: queue.acm.org/detail.cfm?id=3595878
Feedback flows
Cognitive load
Flow state
Oleg Šelajev Developer relations
Tests are essential
Great tests improve Feedback loops Flow state Cognitive load
With bad tests nothing will help your developer productivity*
❌ Can’t run locally Break on changes Flaky runs Slow pipelines
✅ Novel Reproducible Significant
How to do tests?
e2e Integration tests Unit tests
Integration Testing transformation over the years Timeline Mocking Local DBs VMs (Vagrant)
Integration Testing transformation over the years Timeline Docker Docker Compose Docker API
• Container lifecycle & cleanup • Container & service configuration • Integration with frameworks or tests
• Container lifecycle & cleanup • Container & service configuration • Integration with frameworks or tests
Testcontainers-java • Created 7 years ago (Docker is 8 years old) • github.com/testcontainers/testcontainers-java • Uses docker-java API • Integrates with frameworks, like Spring, JUnit • Works with anything that runs in a Docker container
Growing ecosystem of modules
testcontainers.com/modules
testcontainers.com/modules
Why are Testcontainers - 🏆🏆🏆 ● Flexible lifecycle API: isolation vs convenience ● Capable of abstractions (modules) ● Waiting strategies ● Complex network topologies ● Automatic cleanu p ● Everything is dynamic allowing parallelisation
🏆🏆🏆 Feels like a unit, reliable like integration
Environment parity
Dev Prod
Dev CI Prod
● Using Docker-in-Docker (DinD) ● Testcontainers Cloud setup ● Parallelisation https://www.atomicjar.com/2023/01/running-testcontainers-tests-on-gitlab-ci/
Parallelization ● Surefire plugin ○ parallel=classes ○ forkCount=N ○ reuseForks=true ● Showcase ○ github.com/testcontainers/testcontainers-showcase https://maven.apache.org/surefire/maven-surefire-plugin/examples/fork-options-and-parallel-execution.html
Local development environment with SpringBoot 3.1 https://docs.spring.io/spring-boot/docs/3.1.0-SNAPSHOT/reference/htmlsingle/#features.testing.testcontainers.at-development-time
What’s next? — testcontainers.com — testcontainers.cloud — slack.testcontainers.org
Reliable automated tests are essential for developer productivity, sensible continuous delivery setups, and security. But many teams need help creating tests they don’t struggle to maintain and trust enough to rely on in an automated fashion.
In this session, we’ll look at how Testcontainers can easily power your automatic test suites whether you want to run unit tests with real service dependencies, integratin tests or even complex end-to-end and chaos engineering setups. With Testcontainers, you can run tests the same way on developer machines and CI platforms without introducing unnecessary complexity, slowing down your pipelines, or annoying yourself with fragile and error-prone manual setups.
In addition to tests, you will also learn how to set up your local development environment using Testcontainers to run your projects locally with ease, creating a whole new developer experience for your team.
The following resources were mentioned during the presentation or are useful additional information.
for free. You
can too.