Functional testing verifies mobile app functionality and helps your company be popular among users.
Functional testing ensures that all main app functions and features are workable and give correct responses. The type of app, its business goals, and target audience determine the main functions. If it's a social app, the main functions will be adding photos, sending messages, sharing posts, etc. For booking app, it is searching tickets and places, ordering, safe payment methods.
Besides core features, there are crucial test cases to consider:
app launches and works correctly every time
fields and buttons respond correctly
app behavior when something interrupts its work (turning off, incoming call other issues)
users get notifications and alerts about incorrect app work
after system crashes and errors app can resume at the last operation
