Add integration tests

[ZanderCowboy]

https://docs.flutter.dev/testing/overview https://docs.flutter.dev/cookbook/testing/integration/introduction https://github.com/flutter/flutter/tree/main/packages/integration_test https://docs.flutter.dev/testing/integration-tests

[ZanderCowboy]

https://docs.flutter.dev/testing/integration-tests#write-the-integration-test https://medium.com/@ishank.iandroid/title-navigating-flutter-project-management-with-melos-a-comprehensive-walkthrough-a288d8879fcf https://medium.com/@dihsar/the-complete-guide-to-flutter-app-testing-with-examples-4ed7b8188bce. https://flutter-ko.dev/cookbook/testing/integration/introduction#4-write-the-integration-test https://pub.dev/packages/auto_mappr#how-to-use https://seniorturkmen.medium.com/managing-multi-package-flutter-projects-with-melos-a-leap-towards-efficient-development-a305e696fe73 https://github.com/flutter-stripe/flutter_stripe/tree/main/example https://github.com/GetStream/stream-chat-flutter/blob/master/melos.yaml https://github.com/firebase/flutterfire/blob/master/melos.yaml

https://medium.com/flutter-community/test-integration-with-flutter-part-one-401008eab5c7 https://docs.flutter.dev/testing/integration-tests#:~:text=Create%20a%20new%20app%20to%20test%20Add%20the,a%20mobile%20device%20Test%20in%20a%20web%20browser https://medium.com/swlh/getting-started-with-automating-user-testing-in-flutter-3d1ec68d118 https://docs.flutter.dev/testing/overview https://blog.logrocket.com/automated-testing-flutter/ https://docs.flutter.dev/testing/integration-tests https://github.com/flutter/flutter/tree/main/packages/integration_test/example/test_driver https://github.com/flutter/flutter/blob/main/packages/integration_test/android/build.gradle https://docs.flutter.dev/cookbook/testing/integration/introduction https://docs.flutter.dev/testing/integration-tests