Trigger semantics action in widget tests (medium_blog)

main.dart

import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  static const String label = "Hello World!";

  void _showSnackbar(BuildContext context, String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        duration: const Duration(milliseconds: 1500),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Semantics(
              child: const Text(label),
              onTap: () => _showSnackbar(context, "onTap"),
              onDidGainAccessibilityFocus: () =>
                  _showSnackbar(context, "onDidGainAccessibilityFocus"),
              onDidLoseAccessibilityFocus: () =>
                  _showSnackbar(context, "onDidLoseAccessibilityFocus"),
            ),
            ElevatedButton(
              child: const Text("button"),
              onPressed: () {},
            ),
          ],
        ),
      ),
    );
  }
}