Flutter plugins with implements PlatformInterface

main.dart

// Provided by flutter/plugins or similar
class Plugin {
  @override
  void noSuchMethod(Invocation i) {
    throw Exception('Plugin does not implement method ${i.memberName}');
  }
}

class MockPlugin extends Plugin {
  @override
  void noSuchMethod(Invocation i) {
    print('Plugin does not implement method ${i.memberName} (but it didn\'t throw)');
  }
}

// Provided by each plugin
abstract class PluginInterface {
  void methodOne();
  void methodTwo();
}

// Provided by each implementation (note: missing methodTwo)
class MyImplementation extends Plugin implements PluginInterface {
  void methodOne() {
    print("hello");
  }
}

// For tests...
class MyMockImplementation extends MockPlugin implements PluginInterface {
}

void main() {
  final MyMockImplementation myMockImpl = MyMockImplementation();
  myMockImpl.methodOne(); // Print but not throw
  myMockImpl.methodTwo();
  
  final MyImplementation myImpl = MyImplementation();
  myImpl.methodOne();
  myImpl.methodTwo(); // This throws
}