Guide Minitest-based Rails testing with fixtures, VCR, Capybara, and SimpleCov.
npx skills add https://github.com/apdarr/lace --skill testing-apdarr
Please help me install this Agent Skill. Skill: testing Source: https://github.com/apdarr/lace/tree/main/.github/skills/testing Command: npx skills add https://github.com/apdarr/lace --skill testing-apdarr
Rails testing can be complex; this skill provides a structured guide for Minitest-based testing in Rails apps, covering setup, conventions, and best practices to improve reliability and maintainability.
Run the standard Rails test suite to verify code changes and system tests via rails test and rails test:system; follow the Red-Green-Refactor cycle as you work.
High-intent search queries and answers about installing and using this skill.
Rails testing with Minitest is structured by following standard conventions for model, controller, and system tests, using fixtures for data and Capybara for system tests to ensure reliable suites.
The Red-Green-Refactor cycle drives test-driven development by writing a failing test, making it pass, and then refactoring the code to maintain reliability while accelerating implementation.
Yes, VCR and WebMock are used for HTTP interactions in Minitest to record and stub external API requests, ensuring reliable and deterministic test suites across Rails versions.
Yes, Rails system testing supports Capybara and Selenium to simulate user interactions, enabling comprehensive end-to-end testing when running rails test:system.
The best way to measure code coverage in a Minitest Rails application is using SimpleCov, which integrates into the test suite to report reliable coverage metrics across your models and controllers.
Fixtures are used in Rails controller and model tests to provide predefined sample data in the database, establishing a reliable baseline state for validating application behavior.
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