improve focus example

[NobodyForNothing]

Part of #130459. Adds a test to the second focus example and makes the function of the example more clear.

Pre-launch Checklist

• [X] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [X] I read the Tree Hygiene wiki page, which explains my responsibilities.
• [X] I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• [X] I signed the CLA.
• [X] I listed at least one issue that this PR fixes in the description above.
• [X] I updated/added relevant documentation (doc comments with ///).
• [X] I added new tests to check the change I am making, or this PR is test-exempt.
• [X] I followed the breaking change policy and added Data Driven Fixes where supported.
• [X] All existing and new tests are passing.

[A111one]

Welcome

On Wed, 1 May 2024, 3:27 am Justin McCandless, @.***> wrote:

@.**** approved this pull request.

LGTM with nits 👍

Thanks for helping to test these examples!

In examples/api/test/widgets/focus_scope/focus.1_test.dart https://github.com/flutter/flutter/pull/147464#discussion_r1585609112:

+import 'package:flutter_api_samples/widgets/focus_scope/focus.1.dart'

• as example; +import 'package:flutter_test/flutter_test.dart';

• +void main() {

• testWidgets('FocusableText shows content and color depending on focus',
• (WidgetTester tester) async {
• await tester.pumpWidget(const MaterialApp(
• home: Scaffold(
• body: example.FocusableText(
• 'Item 0',
• autofocus: false,
• ),
• ),
• ));
• // Autofocus needs to check no other node in the [FocusScope] is focused and

Super nit for readability: "needs to check no" => "needs to check that no"

In examples/api/test/widgets/focus_scope/focus.1_test.dart https://github.com/flutter/flutter/pull/147464#discussion_r1585609479:

• });
• testWidgets('builds list showcasing focus traversal',

Needs a newline here between the tests.

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[NobodyForNothing]

Can someone rerun Google testing?

[gspencergoog]

Can someone rerun Google testing?

Done, but it looks like there are merge conflicts anyhow.