I learned that app testing involves different aspects to ensure a good user experience. First, there's component testing, which makes sure the component works as expected, looks right visually, and is accessible to everyone.
To achieve this, the video explained how Storybook brings various specialized tools together. For checking if components work and interact correctly, it uses Vitest and Playwright. I saw how Storybook can automatically detect Vitest and run tests on stories, even in watch mode.