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Flutter標準のやり方でテストしてるってことかな？
どの方法を使ってるの？

Testing Flutter apps
https://flutter.dev/docs/testing

Automated testing falls into a few categories:

- A unit test tests a single function, method, or class.
- A widget test (in other UI frameworks referred to as component test) tests a single widget.
- An integration test tests a complete app or a large part of an app.