DockerCon EU 2018: How Docker Changed the Way We Test Our Software

https://dockerconeurope18.smarteventscloud.com/connect/sessionDetail.ww?SESSION_ID=244872

https://testcontainers.org

The examples were adapted from this article:
https://medium.com/@bsideup/testing-your-docker-containers-with-testcontainers-and-groovy-3b9ef97ad1c2

Transcript

1. SERGEI EGOROV Staff Engineer, Pivotal How Docker Containers Changed the Way We Test Our Software
2. “If I had an hour to solve a problem 
 I'd spend 55 minutes thinking about the problem 
 and 5 minutes thinking about solutions.” — Albert Einstein
3. “If I had an hour to fix a bug 
 I'd spend 55 minutes writing a test 
 and 5 minutes fixing the issue.” — Me
4. Software testing
5. Software testing Integration
 Testing System
 Testing Sanity
 Testing Acceptance
 Testing Regression
 Testing UI
 Testing Unit
 Testing Smoke
 Testing
6. Software testing Integration
 Testing Unit
 Testing System
 Testing Dev Dev
7. • Fast • Simple • Catches bugs in the logic • Checks algorithms Unit testing
8. • Powerful • Challenging • Starts real databases • Catches bugs in integrations • Checks assumptions about other systems Integration testing
9. • Powerful • Challenging • Starts real databases • Catches bugs in integrations • Checks assumptions about other systems Integration testing
10. Cross-platform Isolated Reproducible CI friendly Fast 2 1 3 4 5 Integration testing challenges
11. Integration testing transformation Mocking
12. Integration testing transformation Mocking • DB logic is not tested • Assumptions, not facts
13. Integration testing transformation Mocking Local DBs
14. Integration testing transformation Mocking Local DBs • Not cross-platform • Complex installation process • Hard to isolate
15. Integration testing transformation Mocking Local DBs VMs
16. Integration testing transformation Mocking Local DBs VMs • Vagrant to the rescue • Slow • Port management is hard • Heavyweight images
17. Integration testing transformation Mocking Local DBs VMs Docker
18. Image Me
19. Simple
20. Integration testing transformation Mocking Local DBs VMs Docker Fig
 (aka Docker Compose)
21. Declarative
22. Declarative R U UP?
23. Declarative Random ports?
24. Declarative DB per test?
25. IDE integration?
26. Integration testing transformation Mocking Local DBs VMs Docker Fig
 (aka Docker Compose) Docker API
27. WHAT IF I TOLD YOU THERE IS AN API
29. Testcontainers •http://testcontainers.org •Library instead of a tool −Throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container. −Takes care of not just starting, but also running & destroying your test’s dependencies. −Very robust environment discovery (Linux, Windows, Mac OS X, CI environments, Docker in Docker, etc) •OSS project −Originally created by Richard North −MIT licensed −A vibrant community of the testing-oriented people. •JVM first −Initially implemented as a Java library −Community-contributed ports: C#, Golang, NodeJS, Python, Rust −Plans to share the implementation between the languages
30. “Code your containers”
31. Fast feedback
32. Fast feedback Different strategies
33. Fast feedback Host detection
34. Fast feedback Pre-flight environment checks
35. CI friendly
36. CI friendly
37. CI friendly
38. Who is using
39. Thank you! @bsideup