How to mock a static getter's return value in Dart or Flutter?

Question

I would like to figure out how to modify the return value of a static getter for my unit tests in Flutter and Dart.

I\'m unit testing a simple function:

Answer 1

You should not mock classes that you don't own. Your unit test must be platform independent. On your case you should refactor your code to get rid of this dependency.

If you really wanna continue with this dependency at least depends on abstractions:

abstract class MyPlatform {
  bool isAndroid();
  bool isIos();
 }

class MyPlatformImp implements MyPlatform {
  @override
  bool isAndroid() => Platform.isAndroid;
  @override
  bool isIos() => Platform.isIOS;
 }

then you can mock MyPlatform on your uses.

This kind of variable you would test on Integration Tests https://flutter.dev/docs/cookbook/testing/integration/introduction

You can also create different tests for platforms using the onPlatform attribute of test() https://api.flutter.dev/flutter/test_api/test.html