11.6Benefits of Component-Level Testing

Benefit	Page-Level Testing	Component-Level Testing
Speed	Slower (full page render)	Faster (isolated component)
Isolation	Side effects from other components	Pure component behavior
State coverage	Hard to reach all states	Easy to render each state
Debugging	"Something changed on the page"	"This specific component changed"
Maintenance	Tests break when layout changes	Tests stable if component API unchanged

Component-level visual testing in Storybook catches issues earlier than page-level screenshots, at a fraction of the cost. It is the visual testing equivalent of unit tests vs integration tests -- do both, but start with components.