car-interface-android/test/volume_card_test.dart

import 'package:cardash_launcher/core/theme/app_theme.dart';
import 'package:cardash_launcher/data/models/media_playback.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 card shows the now-playing title', (tester) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: AppTheme.light(),
        home: const Scaffold(
          body: VolumeCard(
            volume: VolumeInfo(index: 8, max: 15),
            onSetVolume: _ignoreVolume,
            onToggleMute: _ignore,
            isMusicPlaying: true,
            onPlayPause: _ignore,
            media: MediaPlayback(
              hasAccess: true,
              hasSession: true,
              playing: true,
              title: 'Night Drive',
              artist: 'The Dashboard',
              durationMs: 240000,
              positionMs: 60000,
            ),
          ),
        ),
      ),
    );

    expect(find.text('Night Drive — The Dashboard'), findsOneWidget);
    expect(find.text('Nothing playing'), findsNothing);
  });

  testWidgets('the card shows Nothing playing without a session', (
    tester,
  ) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: AppTheme.dark(),
        home: const Scaffold(
          body: VolumeCard(
            volume: VolumeInfo(index: 8, max: 15),
            onSetVolume: _ignoreVolume,
            onToggleMute: _ignore,
            isMusicPlaying: false,
            onPlayPause: _ignore,
            media: MediaPlayback(),
          ),
        ),
      ),
    );

    expect(find.text('Nothing playing'), findsOneWidget);
  });

  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,
                media: const MediaPlayback(),
                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);
  });
}

void _ignore() {}
void _ignoreVolume(int _) {}