Trigger semantics action in widget tests (medium blog)

main.dart

import 'package:bug/main.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Tap action', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());
    final helloWorldTextFinder = find.text("Hello World!");

    final semantics = tester.getSemantics(helloWorldTextFinder);
    tester.binding.pipelineOwner.semanticsOwner!
        .performAction(semantics.id, SemanticsAction.tap);
    await tester.pump(const Duration(seconds: 1));
    expect(find.byType(SnackBar), findsOneWidget);
  });

  testWidgets('Gain focus action', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());
    final helloWorldTextFinder = find.text("Hello World!");

    final semantics = tester.getSemantics(helloWorldTextFinder);
    tester.binding.pipelineOwner.semanticsOwner!
        .performAction(semantics.id, SemanticsAction.didGainAccessibilityFocus);
    await tester.pump(const Duration(seconds: 1));
    expect(find.byType(SnackBar), findsOneWidget);
  });

  testWidgets('Lose focus action', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());
    final helloWorldTextFinder = find.text("Hello World!");

    final semantics = tester.getSemantics(helloWorldTextFinder);
    tester.binding.pipelineOwner.semanticsOwner!
        .performAction(semantics.id, SemanticsAction.didLoseAccessibilityFocus);
    await tester.pump(const Duration(seconds: 1));
    expect(find.byType(SnackBar), findsOneWidget);
  });
}