car-interface-android/test/volume_card_test.dart

import 'package:cardash_launcher/core/theme/app_theme.dart';
import 'package:cardash_launcher/data/models/system_status.dart';
import 'package:cardash_launcher/features/home/widgets/volume_card.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('the ring switches between play and pause', (tester) async {
    var playing = false;
    var taps = 0;

    await tester.pumpWidget(
      MaterialApp(
        theme: AppTheme.dark(),
        home: Scaffold(
          body: StatefulBuilder(
            builder: (context, setState) {
              return VolumeCard(
                volume: const VolumeInfo(index: 8, max: 15),
                onSetVolume: (_) {},
                onToggleMute: () {},
                isMusicPlaying: playing,
                onPlayPause: () {
                  taps++;
                  setState(() => playing = !playing);
                },
              );
            },
          ),
        ),
      ),
    );

    expect(find.byIcon(Icons.play_arrow_rounded), findsOneWidget);
    expect(find.byIcon(Icons.pause_rounded), findsNothing);

    await tester.tap(find.byIcon(Icons.play_arrow_rounded));
    await tester.pump();
    expect(taps, 1);
    expect(find.byIcon(Icons.pause_rounded), findsOneWidget);
    expect(find.byIcon(Icons.play_arrow_rounded), findsNothing);
  });
}