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MyCalculator - Testable Android App Kata

Before beginning

TDD / MV* Approach / Fully testable Android Application

JUnit, Mockito 2

Kotlin Inside ;)

MVP in a nutshell

Model: the data layer

View: the UI layer, displays data received from Presenter, reacts to user input. On Android, we treat Activities, Fragments, and android.view.View as View from MVP.

Presenter: responds to actions performed on the UI layer, performs tasks on Model objects (using Use Cases), passes results of those tasks to Views.

[View] ->> user events >> [Presenter] [Presenter] ->> updates >> [View] [Presenter] ->> interactions/use cases >> [Model] [Model] ->> updates >> [Presenter]

http://macoscope.com/blog/model-view-presenter-architecture-in-android-applications/

https://medium.com/proandroiddev/clean-your-activity-using-delegation-pattern-fcaafd82336d

TODO

  • Typing digit button display digit to screen
  • Applying operator +,-,x,/
  • Allow decimal numbers
  • Complete Expression Display e.i: "2000.5 + 10"
  • Parenthesis Handle