Rethinking integration testing with Testcontainers

🛠 git IDE Docker (including Docker compose for some steps) Build tool: Maven / Gradle

➡ github.com/testcontainers/workshop docker pull postgres:14-alpine docker pull redis:6-alpine docker pull openjdk:8-jre-alpine fl docker pull con uentinc/cp-kafka:5.4.3

📖 https://bit.ly/devoxx-uk-2022-TC-lab

Agenda Intro & theory — 10 minutes Setup the project — 15 minutes Adding the rst tests — 10 minutes Your rst Testcontainers integration — 15 minutes Redis tests & Redis Generic container — 20 minutes Kafka tests — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Oleg Šelajev Developer relations Kevin Wittek Software engineer Piotr Przybył Software engineer / gardener

e2e Integration tests Unit tests By Unknown author - U.S. Army Photo, Public Domain, https://commons.wikimedia.org/w/index.php?curid=55124

Microservices Testing Honeycomb https://labs.spotify.com/2018/01/11/testing-of-microservices/

https://martinfowler.com/bliki/IntegrationTest.html

• Process isolation • FileSystem, Network • CPU/memory limits

• Con guring multiple services simultaneously • Flexibility in creating test data or use-cases • Separation of production & test environments • Dynamic con guration of external mappings • Parallel deployments fi fi 😅

testcontainers.org

System checks Checking the system… ✔ Docker version should be at least 1.6.0 ✔ Docker environment should have more than 2GB free disk space ✔ File should be mountable ℹ︎ ✔ A port exposed by a docker container should be accessible

During After

The problem Extra mile Port conflicts Port randomization Hard-coded scenarios Data-driven tests Slow tests Parallelization

We think it’s a useful default option for creating a reliable environment for running tests. … Our teams have consistently found this library of programmable, lightweight and disposable containers to make functional tests more reliable. https://www.thoughtworks.com/en-us/radar/languages-and-frameworks/testcontainers

Downloads

Unique IPs

What to do if you have no Docker?

Docker environments https://www.atomicjar.com/2021/10/docker-on-windows-and-macos

Testcontainers Cloud testcontainers.cloud

Model: record Rating (String talkId, Integer value) {}

Resources — github.com/testcontainers/testcontainers-java — www.testcontainers.org

Let’s get started ! — github.com/testcontainers/workshop

Agenda Intro & theory — ✅ Setup the project: Steps 1 & 2 — 15 minutes Adding the rst tests — 10 minutes Your rst Testcontainers integration — 15 minutes Redis tests & Redis Generic container — 20 minutes Kafka tests — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min github.com/ testcontainers/ workshop

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests: Step 3 — 10 minutes Your rst Testcontainers integration — 15 minutes Redis tests & Redis Generic container — 20 minutes Kafka tests — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration: Step 4 — 15 minutes Redis tests & Redis Generic container — 20 minutes Kafka tests — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container: Steps 5 & 6 — 20 minutes Kafka tests — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container — ✅ Kafka tests: Step 7 — 15 minutes Testcontainers without the framework support — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container — ✅ Kafka tests — ✅ Testcontainers without the framework support: Step 8 — 20 min Database initialization setup — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container — ✅ Kafka tests — ✅ Testcontainers without the framework support — ✅ Database initialization setup: Step 9 — 20 min fi fi Migrating Docker-compose to Testcontainers — 20 min

Agenda Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container — ✅ Kafka tests — ✅ Testcontainers without the framework support — ✅ Database initialization setup — ✅ fi fi Migrating Docker-compose to Testcontainers: Step 10 — 20 min

Congrats! Intro & theory — ✅ Setup the project — ✅ Adding the rst tests — ✅ Your rst Testcontainers integration — ✅ Redis tests & Redis Generic container — ✅ Kafka tests — ✅ Testcontainers without the framework support — ✅ Database initialization setup — ✅ fi fi Migrating Docker-compose to Testcontainers — ✅