Containerized Testing (Docker Basics)

Summary

Running tests inside Docker containers ensures a consistent, isolated environment every time — eliminating 'works on my machine' inconsistencies between local and CI test runs.

• 1Write a basic Dockerfile that packages your test suite and its dependencies.
• 2Run your test suite inside a container and compare consistency to running it locally.
• 3Learn why containerized test environments reduce a common source of flaky, environment-specific failures.