Integration and end-to-end testing with TestСontainers

Transcript

1. Integration and end-to-end testing with TestСontainers Nikolay Kuznetsov @nikolayk812 ContainerDays, Hamburg, 26 June 2019
2. About me • Go developer at Zalando Helsinki • Java developer at Infobip, DevExperts • C developer at Samsung, Motorola
3. Why integration testing?
4. Trade-offs Test Runtime
5. Integration testing evolution • In-memory mocking • Local DBs • Vagrant • Docker, Docker Compose • Docker API
6. How to start Docker containers for integration test? • Shell scripts • Maven plugin • Docker Compose • … • MiniKube, Kubernetes
7. Shell scripts
8. Maven plugins github.com/fabric8io/docker-maven-plugin
9. Docker Compose
11. TestContainers • github.com/testcontainers/testcontainers-java • Wraps docker-java library • Docker environment discovery • Host port randomization • Containers clean up on JVM shutdown • Waiting strategies
12. As simple as static PostgreSQLContainer postgres = new PostgreSQLContainer(); static GenericContainer redis = new GenericContainer("redis:5.0.5") .withExposedPorts(6379);
13. Docker environment discovery
14. Host port randomization • To prevent port conflicts • Enables parallel builds • API to get a host port
15. Containers cleanup https://github.com/testcontainers/moby-ryuk
16. Waiting strategies
17. Demo github.com/nikolayk812/cd-tc-demo
18. Why end-to-end testing? • Test business flows which go through multiple microservices before production deployment • Replace a legacy service with a new implementation, make sure business flows hold
19. E2E setup Item Service User Service Spring Cloud Netflix Eureka
21. Demo github.com/nikolayk812/cd-tc-demo
22. Hints • Host port forwarding Testcontainers.exposeHostPorts() • Fixed host port for remote debug GenericContainer.addFixedExposedPort() • Disable Ryuk set env TESTCONTAINERS_RYUK_DISABLED=true
23. Alternatives to E2E testing Goal is to minimize chances of breaking production • Staging environments Handling team boundaries? • Canary deployment • Contract testing Spring Cloud Contract
24. Modules • 10+ DB modules • MockServer • LocalStack = Atlassian’s local AWS cloud stack • Toxiproxy • Kafka
25. Takeaways • https://testcontainers.org • Balance between flexibility, speed and features • Works on Mac, Linux, Windows
26. Thank you! @nikolayk812 nikolayk812