test.dart

import 'package:flutter/material.dart';

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

  @override
  _DebugUiPageState createState() => new _DebugUiPageState();
}

class _DebugUiPageState extends State<DebugUiPage> {


  @override
  Widget build(BuildContext context) {
   return new Container(
     width: 10.0,
     height: 10.0,
     child: new CircleAvatar(
         backgroundImage: new NetworkImage(
             'https://i.imgur.com/72z8TvR.jpg')
     ),
   );
  }


}