Agent Skills: testing

Expert guidance for Rails testing infrastructure, test types, and what to test. Use when writing tests, setting up a test suite, choosing between test types, configuring system tests (Capybara), request tests, integration tests, helper tests, mailer tests, job tests, Action Cable tests, parallel testing, CI setup, test database management, or improving test coverage. Covers the test runner, fixtures vs factories, parallel testing, system tests (drivers, screenshots), request tests, controller tests (legacy), helper tests, mailer tests, job tests, Action Cable tests, test coverage, CI patterns, and test database strategies. Trigger on "test", "testing", "test suite", "system test", "request test", "integration test", "test runner", "parallel testing", "capybara", "test database", "CI testing", "test coverage".