import 'package:flutter/material.dart';

void main() => runApp(App());

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "test",
      theme: ThemeData(
        primarySwatch: Colors.yellow
      ),
      home: MyWidget()
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.add),
            onPressed: () {},
            tooltip: 'test',
          )
        ],
      ),
    );
  }
}