Audience asks whether Radoslav Stankov writes unit tests for ViewComponents, given that testability is often cited as their main advantage. Answer: no unit tests. He writes Capybara smoke tests that visit every Lookbook preview page and assert it doesn't blow up, plus end-to-end tests for all business logic. More complex logic is pushed into business service objects and tested there. For a real component library he would add visual regression (screenshot-diff) tests on top of previews.