Hi!

For unit and widget testing you don’t need any physical device, so there’s no need for frameworks like Expo. With Flutter you can run your UI tests and check UX behavior just like you’ll do it normally with testing frameworks, but without requirements to have physical device. You can read more about tests here: https://flutter.io/docs/testing

However, if you’d like to make some integration testing, you can use real device, but then you’ll need Mac for iOS testing, as you mentioned above.