Setting Up Rails System Tests with Docker and Capybara

Testing modern web applications requires ensuring that all components work together seamlessly, from the database to the browser interface. Setting up robust system tests can be challenging, especially when managing browser drivers and consistent environments across different developer machines. This course guides you through establishing a reliable, reproducible system testing pipeline for Rails applications using Docker. You will transition from manual browser testing to automated, containerized system tests that run identically in development and continuous integration environments. By isolating your test runners and browser drivers, you eliminate the classic "it works on my machine" dilemmas and build a suite you can trust. What you'll learn: - Understand the core concepts of system testing, Capybara, and the Rails testing framework - Configure Docker Compose to run a Rails application alongside a headless browser container - Set up RSpec and Capybara to communicate correctly across isolated Docker containers - Manage database cleaning, transactional fixtures, and test asset compilation in a containerized flow - Debug failing system tests using screenshots and automated HTML dumps in headless environments - Apply modern testing practices including basic container health checks and clean configuration patterns This course begins with foundational testing concepts and Docker networking basics, then moves step-by-step through configuration files, environment variables, and test execution. You will read clear explanations, analyze configuration templates, and learn to troubleshoot common connection issues between your Rails app and Selenium drivers. This course is designed for beginner to intermediate Rails developers who want to automate their browser testing and adopt modern, containerized development workflows. No prior experience with Docker or advanced testing frameworks is required. Start building reliable, automated end-to-end tests for your Rails applications today.