anchor.diff:                focusNode: FocusNode(),
                 cursorColor: Colors.red,
                 backgroundCursorColor: Colors.blue,
  -              style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1.copyWith(fontFamily: 'Roboto'),
  +              style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1!.copyWith(fontFamily: 'Roboto'),
                 keyboardType: TextInputType.text,
                 inputFormatters: <TextInputFormatter>[LengthLimitingTextInputFormatter(6)],
               ),
  
positive.code:       focusNode: FocusNode(),
        cursorColor: Colors.red,
        backgroundCursorColor: Colors.blue,
        style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1.copyWith(fontFamily: 'Roboto'),
        keyboardType: TextInputType.text,
      );
  
  
negative.code: 
      testWidgets('input from changing controller', (WidgetTester tester) async {
        final TextEditingController controller = TextEditingController(text: testText);
        Widget build({ TextEditingController? textEditingController }) {
          return MediaQuery(
            data: const MediaQueryData(),
            child: Directionality(
  