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Fixes https://github.com/flutter/flutter/issues/181196 This PR fixes the description for the bySemanticsLabel/Identifier matchers, which was missing. Note: The framework uses `byElementPredicate()` in a bunch of places in tests, but not all use the `description` field. Should we add descriptions to those? Example: ```dart import 'package:flutter/material.dart'; import 'package:flutter_test/flutter_test.dart'; void main() { testWidgets('bySemanticsLabel', (tester) async { await tester.pumpWidget(const MaterialApp(home: Text('hello'))); await tester.pumpAndSettle(); expect(find.bySemanticsLabel('goodbye'), findsOneWidget); }); testWidgets('bySemanticsLabel regex', (tester) async { await tester.pumpWidget(const MaterialApp(home: Text('hello'))); await tester.pumpAndSettle(); expect(find.bySemanticsLabel(RegExp('^foo')), findsOneWidget); }); testWidgets('bySemanticsIdentifier', (tester) async { await tester.pumpWidget(const MaterialApp(home: Text('hello'))); await tester.pumpAndSettle(); expect(find.bySemanticsIdentifier('goodbye'), findsOneWidget); }); testWidgets('bySemanticsIdentifier regex', (tester) async { await tester.pumpWidget(const MaterialApp(home: Text('hello'))); await tester.pumpAndSettle(); expect(find.bySemanticsIdentifier(RegExp('^foo')), findsOneWidget); }); } ``` now gives: ```dart ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following TestFailure was thrown running a test: Expected: exactly one matching candidate Actual: _ElementPredicateWidgetFinder:<Found 0 widgets with a semantics label named "goodbye": []> Which: means none were found but one was expected When the exception was thrown, this was the stack: #4 main.<anonymous closure> (file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart:8:5) <asynchronous suspension> #5 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:192:15) <asynchronous suspension> #6 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1692:5) <asynchronous suspension> <asynchronous suspension> (elided one frame from package:stack_trace) This was caught by the test expectation on the following line: file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart line 8 The test description was: bySemanticsLabel ════════════════════════════════════════════════════════════════════════════════════════════════════ ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following TestFailure was thrown running a test: Expected: exactly one matching candidate Actual: _ElementPredicateWidgetFinder:<Found 0 widgets with a semantics label matching the pattern "^foo": []> Which: means none were found but one was expected When the exception was thrown, this was the stack: #4 main.<anonymous closure> (file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart:14:5) <asynchronous suspension> #5 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:192:15) <asynchronous suspension> #6 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1692:5) <asynchronous suspension> <asynchronous suspension> (elided one frame from package:stack_trace) This was caught by the test expectation on the following line: file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart line 14 The test description was: bySemanticsLabel regex ════════════════════════════════════════════════════════════════════════════════════════════════════ ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following TestFailure was thrown running a test: Expected: exactly one matching candidate Actual: _ElementPredicateWidgetFinder:<Found 0 widgets with a semantics identifier named "goodbye": []> Which: means none were found but one was expected When the exception was thrown, this was the stack: #4 main.<anonymous closure> (file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart:20:5) <asynchronous suspension> #5 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:192:15) <asynchronous suspension> #6 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1692:5) <asynchronous suspension> <asynchronous suspension> (elided one frame from package:stack_trace) This was caught by the test expectation on the following line: file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart line 20 The test description was: bySemanticsIdentifier ════════════════════════════════════════════════════════════════════════════════════════════════════ ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following TestFailure was thrown running a test: Expected: exactly one matching candidate Actual: _ElementPredicateWidgetFinder:<Found 0 widgets with a semantics identifier matching the pattern "^foo": []> Which: means none were found but one was expected When the exception was thrown, this was the stack: #4 main.<anonymous closure> (file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart:26:5) <asynchronous suspension> #5 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:192:15) <asynchronous suspension> #6 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1692:5) <asynchronous suspension> <asynchronous suspension> (elided one frame from package:stack_trace) This was caught by the test expectation on the following line: file:///Users/navaronbracke/Desktop/matchers_test/test/widget_test.dart line 26 The test description was: bySemanticsIdentifier regex ════════════════════════════════════════════════════════════════════════════════════════════════════ ``` *If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].* ## 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 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