<Todo List Android App -- Clean up code -- Espress...

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Todo List Android App -- Clean up code -- Espresso and Unit Tests
Trying to improve this code and separate the business logic as much as possible. I am feeling kind of lost lol. Any advice on how to test this app and clean up the code would be very appreciated. I don't want to post all of the code on here so I will link my repository on GitHub. Really need this explained simply. Thank you for your time!!
link -> https://github.com/sammorton11/NotesApp
class AddEditNoteActivity :...