feat: setting background music to 60% for better tuning

packages/pinball_audio/lib/src/pinball_audio.dart

@@ -59,7 +59,7 @@ typedef CreateAudioPool = Future<AudioPool> Function(
 typedef PlaySingleAudio = Future<void> Function(String);
 
 /// Defines the contract for looping a single audio.
-typedef LoopSingleAudio = Future<void> Function(String);
+typedef LoopSingleAudio = Future<void> Function(String, {double volume});
 
 /// Defines the contract for pre fetching an audio.
 typedef PreCacheSingleAudio = Future<void> Function(String);
@@ -111,8 +111,8 @@ class _LoopAudio extends _Audio {
   Future<void> load() => preCacheSingleAudio(prefixFile(path));
 
   @override
-  void play() {
+  void play({double volume = 1}) {
-    loopSingleAudio(prefixFile(path));
+    loopSingleAudio(prefixFile(path), volume: volume);
   }
 }
 
@@ -130,14 +130,30 @@ class _SingleLoopAudio extends _LoopAudio {
   bool _playing = false;
 
   @override
-  void play() {
+  void play({double volume = 1}) {
     if (!_playing) {
-      super.play();
+      super.play(volume: volume);
       _playing = true;
     }
   }
 }
 
+class _BackgroundMusicAudio extends _SingleLoopAudio {
+  _BackgroundMusicAudio({
+    required PreCacheSingleAudio preCacheSingleAudio,
+    required LoopSingleAudio loopSingleAudio,
+  }) : super(
+          preCacheSingleAudio: preCacheSingleAudio,
+          loopSingleAudio: loopSingleAudio,
+          path: Assets.music.background,
+        );
+
+  @override
+  void play({double volume = .6}) {
+    super.play(volume: volume);
+  }
+}
+
 class _RandomABAudio extends _Audio {
   _RandomABAudio({
     required this.createAudioPool,
@@ -292,10 +308,9 @@ class PinballAudioPlayer {
         path: Assets.sfx.cowMoo,
         duration: const Duration(seconds: 2),
       ),
-      PinballAudio.backgroundMusic: _SingleLoopAudio(
+      PinballAudio.backgroundMusic: _BackgroundMusicAudio(
         preCacheSingleAudio: _preCacheSingleAudio,
         loopSingleAudio: _loopSingleAudio,
-        path: Assets.music.background,
       ),
     };
   }

packages/pinball_audio/test/src/pinball_audio_test.dart

@@ -33,7 +33,7 @@ class _MockPlaySingleAudio extends Mock {
 }
 
 class _MockLoopSingleAudio extends Mock {
-  Future<void> onCall(String url);
+  Future<void> onCall(String url, {double volume});
 }
 
 abstract class _PreCacheSingleAudio {
@@ -77,7 +77,8 @@ void main() {
       when(() => playSingleAudio.onCall(any())).thenAnswer((_) async {});
 
       loopSingleAudio = _MockLoopSingleAudio();
-      when(() => loopSingleAudio.onCall(any())).thenAnswer((_) async {});
+      when(() => loopSingleAudio.onCall(any(), volume: any(named: 'volume')))
+          .thenAnswer((_) async {});
 
       preCacheSingleAudio = _MockPreCacheSingleAudio();
       when(() => preCacheSingleAudio.onCall(any())).thenAnswer((_) async {});
@@ -443,8 +444,10 @@ void main() {
         audioPlayer.play(PinballAudio.backgroundMusic);
 
         verify(
-          () => loopSingleAudio
+          () => loopSingleAudio.onCall(
-              .onCall('packages/pinball_audio/${Assets.music.background}'),
+            'packages/pinball_audio/${Assets.music.background}',
+            volume: .6,
+          ),
         ).called(1);
       });
 
@@ -455,8 +458,10 @@ void main() {
           ..play(PinballAudio.backgroundMusic);
 
         verify(
-          () => loopSingleAudio
+          () => loopSingleAudio.onCall(
-              .onCall('packages/pinball_audio/${Assets.music.background}'),
+            'packages/pinball_audio/${Assets.music.background}',
+            volume: .6,
+          ),
         ).called(1);
       });
     });