The PR is: #142516

I tried a variety of ways to test this but couldn't find a way to prove that in a test the dropdown menu reacts to the focus node being focused. It seems to work fine in production.

Here's the skeleton of a test:

  testWidgets('DropDownMenu.focusNode', (WidgetTester tester) async {
    final FocusNode focusNode = FocusNode();
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: DropdownMenu<String>(
          focusNode: focusNode,
          dropdownMenuEntries: const <DropdownMenuEntry<String>>[
            DropdownMenuEntry<String>(
              value: 'Yolk',
              label: 'Yolk',
            ),
            DropdownMenuEntry<String>(
              value: 'Eggbert',
              label: 'Eggbert',
            ),
          ],
        ),
      ),
    )); 
    // expectation showing the drop-down isn't focused
    focusNode.requestFocus();
    await tester.pump();
    // expectation showing the drop-down _is_ focused
  });

Things I tried:

using tester.sendKeyEvent to see if the text field is getting text input
doing a paints expectation to see that the focus ring is showing
checking the primaryFocus to see if it changes

None of these things could prove the patch was changing anything. When I flutter run the test I can see it get focused when the requestFocus call is made, so I really don't understand what's going on.

DropdownMenu doesn't have a focusNode #142384

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`DropdownMenu` doesn't have a focusNode #142384