Cloud Integration Testing Made easy with LocalStack and Testcontainers

Cloud Integration Testing Made Easy with LocalStack and Testcontainers used on 31st of August 2023 in the LocalStack Community virtual meetup.

Transcript

1. Cloud Integration Testing Made easy with LocalStack and Testcontainers localstack.cloud
2. Anca Ghenade - Developer Advocate - anca.ghenade@localstack.cloud @tinyg210
3. 1. The Software Ninjas are tasked with developing a new web application on AWS Cloud 2. Developing on a local machine, they soon find out that there are lots of dependencies with resources in the cloud How it goes…
4. 3. They realize that the dev & test loop is extremely slow and tedious. Every local change needs to be packaged and uploaded to the cloud for testing. 4. Now the Software Ninja has a red build on their feature branch, but can’t efficiently test and debug their code in the CI/CD pipeline.
5. 5. The whole team is using Git flow for development - one CI build per feature branch. There is an explosion of different environments required for development (branches x developers). 6. The Ninja manager approaches the team and complains that AWS dev/test resources are not being cleaned up properly causing cost spikes.
6. How much of your system you can test Cloud emulation Full cloud emulation with service integration 3 Staging environments Highest fidelity because it actually runs in the cloud 4 Mocking Mock out cloud APIs 1 Service emulation Replace individual services with local versions 2 What about all the important testing?
7. WE INTERRUPT THE REGULAR SCHEDULED PRESENTATION TO BRING YOU THIS IMPORTANT STORY TIME
9. So how can we bring the ease and speed of unit tests into these integration tests?
12. https://github.com/tinyg210/localstack-testcontainers-meetup-demo
14. Test successful POST Test successful GET Test fails validation on incorrect values Test 404 on wrong param
15. Tips and Tricks
16. Use a waiter to make sure your Lambdas are in state ACTIVE and not just created.
17. Source: https://aws.amazon.com/blogs/compute/coming-soon-expansion-of-aws-lambda-states-to-all-functions/
19. Use this nifty configuration to scan the LocalStack logs and make sure your instance is in the right state before the tests are allowed to start:
21. Streaming container output to an SLF4J logger
23. Thank You
24. PSAs
25. &
27. Q&A