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Containerizing Tests with Docker 🐳🐙
Stefan Teixeira @stefan_teixeira
• QA Automation Engineer @ Toptal • Blogs: stefanteixeira.com.br (pt-br) /
stefanteixeira.com (en)
Contact:• E-mail: [email protected] • Twitter: twitter.com/stefan_teixeira • LinkedIn: linkedin.com/in/stefanteixeira • GitHub: github.com/stefanteixeira • SlideShare: slideshare.net/stefanteixeira
About me
Why?
Why?
• Reprodutibility
Why?
• Reprodutibility
Why?
• Scalability
Why?
• Scalability
Why?
• Containers are (really) fast
Why?
• Containers are (really) fast
Docker Compose
Docker Compose
• Tool for defining and running multi-container applications
https://docs.docker.com/compose/
Docker Compose
• Tool for defining and running multi-container applications
• Previously known as Fig
https://docs.docker.com/compose/
Docker Compose
• Tool for defining and running multi-container applications
• Previously known as Fig
• YAML ❤
https://docs.docker.com/compose/
Compose File
Containerizing Tests with Docker
Containers != mini-VMs
https://twitter.com/rhein_wein/status/662995114235678720
Motivation
#1
If tests (except unit tests) are hard to run locally, developers will not run them.
¯\_(ツ)_/¯
#2
Sometimes, it’s really hard to configure a test environment.
😫
“Docker delivers a predictable, reproducible testing environment."
🐳❤
(Laura Frank, Codeship)
Examples
App A
App A
DB
App A
DB Mock Service
App A
DB Mock Service
API Tests
App A
DB Mock Service
API Tests
UI Tests
App A
DB Mock Service
API Tests
UI Tests
Security Tests
App A
DB Mock Service
API Tests
UI Tests
Security Tests
Smoke Tests
Demo
Demo
• Very simple example, with three containers:
• App (a REST API written in Node.js) • DB (MongoDB database) • API Tests (written with Supertest)
• https://github.com/stefanteixeira/demo-testing-compose
Points of attention
• Logs
Points of attention
• Logs • volumes or data containers
Points of attention
• Logs • volumes or data containers
• Startup time
Points of attention
• Logs • volumes or data containers
• Startup time • wait-for-it, netcat (nc), curl, wait_for module
(Ansible)
Points of attention
• Building images
Points of attention
• Building images • minimal base images: Alpine-linux, Phusion
Points of attention
• Building images • minimal base images: Alpine-linux, Phusion • automate the process
References• “Stop being lazy and test your software”:
• https://www.youtube.com/watch?v=Mx1Il9wIepw • http://www.slideshare.net/rheinwein/stop-being-lazy-and-test-
your-software
• https://hharnisc.github.io/2016/06/19/integration-testing-with-docker-compose.html
• https://docs.docker.com/compose/startup-order/
• https://github.com/vishnubob/wait-for-it
• https://www.ansible.com/blog/six-ways-ansible-makes-docker-compose-better
Stefan Teixeira @stefan_teixeira
Thanks!
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