How to Test State Management in Vibecoded Apps

Navigate between pages and verify that state is preserved where it should be. Fill in a form, navigate away, come back, and check if the form data is still there. Apply filters on a list page, view a detail page, go back, and confirm the filters are still active. AI-generated apps frequently reset local state on navigation because components are unmounted and remounted.

Test the opposite as well: state that should reset on navigation. If you view user A's profile and then navigate to user B's profile, user A's data should not flash briefly before user B's loads. This 'stale data flash' is extremely common in vibecoded apps that use client-side caching without proper cache invalidation.

When the same data appears in multiple places, updating it in one place should update it everywhere. Change your profile name and verify it updates in the header, sidebar, and any other place it is displayed. AI-generated apps often fetch data independently for each component, leading to inconsistent displays after updates.

Test the sync between server state and client state. Make a change, refresh the page, and verify the change persisted. Then make a change directly in the database or via API and verify the app picks up the change on next load or through real-time sync. Many vibecoded apps cache aggressively and show outdated data even after the server state has changed.

Test rapid user interactions: click a button multiple times quickly, toggle a switch on and off rapidly, or trigger concurrent state updates. AI-generated state logic often has race conditions where rapid interactions cause the state to end up in an inconsistent or unexpected value.

Test the app's behavior under memory pressure by opening many tabs or navigating extensively without refreshing. Check for memory leaks using browser DevTools — state stores that grow unboundedly (for example, caching every API response without eviction) will eventually cause the app to slow down or crash. AI-generated code rarely implements cache eviction policies.