I've set up jest with mockIonicReact from '@ionic/react-test-utils' according to ionic's blog post here: https://ionicframework.com/blog/testing-ionic-react-apps-with-jest-and-react-testing-library/
Also set up react-hook-form with require("mutationobserver-shim") according to the docs here: https://react-hook-form.com/faqs#question9
The form is self contained to demonstrate issues with firing events using fireEvent from @testing-library/react and the ionic teams's solution with ionFireEvent from @ionic/react-test-utils;
The component under test is IonicHookForm found in src/components. The form has 3 simple text inputs for first, middle, and last name; notice the placement of the testId attribute for lastName: unlike firstname and middlename where the testId is on the IonInput, lastName places it on the Controller component from react-hook-form.