E2e Testing Patterns

This is your reference guide when you need to build or fix end-to-end tests that actually work in CI. It covers the practical stuff: stable selectors, handling flaky tests, parallelization strategies, and setting up test isolation. The implementation playbook walks through templates for common patterns like multi-browser testing and accessibility validation. Use it when you're testing critical user flows or debugging why your E2E suite keeps failing at 2am. It won't help with unit tests or environments where UI automation isn't feasible, but if you're shipping web apps and need confidence before deploy, this gives you the patterns to make that happen.