Test Screen for controller value reset

test_screen.dart

import 'package:flutter/material.dart';

class TestScreen extends StatefulWidget {
  TestScreen({Key? key}) : super(key: key);

  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  final testController = TextEditingController();

  @override
  State<StatefulWidget> createState() => _TestScreenState();
}

class _TestScreenState extends State<TestScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0.0,
        iconTheme: const IconThemeData(color: Colors.black, size: 35),
        title: const Text('Login', style: TextStyle(color: Colors.black)),
        centerTitle: true,
      ),
      body: Column(
        children: [
          Form(
              key: widget._formKey,
              child: TextFormField(
                controller: widget.testController,
              ))
        ],
      ),
    );
  }
}