void main() {
  await tester.pumpWidget(
    MaterialApp(
      home: Scaffold(
        body: Center(
          child: PopupMenuButton<String>(
            key: popupMenuButtonKey,
            child: const Text('button'),
            onSelected: (String result) {},
            itemBuilder: (BuildContext context) {
              return <PopupMenuEntry<String>>[
                // This menu item's height will be 48 because the default minimum height
                // is 48 and the height of the text is less than 48.
                const PopupMenuItem<String>(
                  value: '0',
                  child: Text('Item 0'),
                ),
                // This menu item's height parameter specifies its minimum height. The
                // overall height of the menu item will be 50 because the child's
                // height 40, is less than 50.
                const PopupMenuItem<String>(
                  height: 50,
                  value: '1',
                  child: SizedBox(
                    height: 40,
                    child: Text('Item 1'),
                  ),
                ),
                // This menu item's height parameter specifies its minimum height, so the
                // overall height of the menu item will be 75.
                const PopupMenuItem<String>(
                  height: 75,
                  value: '2',
                  child: SizedBox(
                    child: Text('Item 2'),
                  ),
                ),
                // This menu item's height will be 100.
                const PopupMenuItem<String>(
                  value: '3',
                  child: SizedBox(
                    height: 100,
                    child: Text('Item 3'),
                  ),
                ),
              ];
            },
          ),
        ),
      ),
    ),
  );
}