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

10. None

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

20. None

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