add the test code

Author: Lex1377

source/core/assets/saves/game_save.json

@@ -1 +1 @@
-{"playerPosition":{"x":1.2306137,"y":7.9963317},"playerHealth":644,"playerGold":50,"timestamp":1758105919553,"towers":[{"type":"dino","width":2,"height":2,"position":{"x":11,"y":6.5},"health":1,"damage":8,"range":2,"attackCooldown":0.8,"attackTimer":5.6833525},{"type":"dino","width":2,"height":2,"position":{"x":11,"y":6.5},"health":1,"damage":8,"range":2,"attackCooldown":0.8,"attackTimer":5.6833525},{"type":"bone","width":2,"height":2,"position":{"x":1.5,"y":3},"health":1,"damage":5,"range":3,"attackCooldown":1,"attackTimer":3.6499972},{"type":"bone","width":2,"height":2,"position":{"x":1.5,"y":3},"health":1,"damage":5,"range":3,"attackCooldown":1,"attackTimer":3.6499972},{"type":"bone","width":2,"height":2,"position":{"x":3,"y":3.5},"health":1,"damage":5,"range":3,"attackCooldown":1,"attackTimer":0.6000001},{"type":"bone","width":2,"height":2,"position":{"x":3,"y":3.5},"health":1,"damage":5,"range":3,"attackCooldown":1,"attackTimer":0.6000001}],"enemies":[{"type":"drone","position":{"x":1.0878214,"y":7.580058},"health":25},{"type":"boss","position":{"x":1.6928216,"y":6.936264},"health":143},{"type":"tank","position":{"x":3.9022415,"y":8.181043},"health":150},{"type":"grunt","position":{"x":4.171674,"y":5.18501},"health":45},{"type":"grunt","position":{"x":4.4241853,"y":4.3020663},"health":75},{"type":"tank","position":{"x":5.4707465,"y":6.98153},"health":100}]}
+{}

source/core/src/test/com/csse3200/game/integration/AudioIntegrationTest.java

@@ -61,7 +61,7 @@ void shouldIntegrateBackgroundMusicFlow() {
         audioService.registerMusic("bgm", "bgm.mp3");
 
         musicEntity.getEvents().trigger("playMusic", "bgm");
-        verify(mockMusic).setVolume(0.5f);
+        verify(mockMusic).setVolume(audioService.getMusicVolume());
         verify(mockMusic).setLooping(true);
         verify(mockMusic).play();
 
@@ -82,7 +82,7 @@ void shouldIntegrateSoundEffectFlow() {
         audioService.registerSound("effect", "effect.ogg");
 
         soundEntity.getEvents().trigger("playSound", "effect");
-        verify(mockSound).play(0.5f);
+        verify(mockSound).play(audioService.getSoundVolume());
 
         soundEntity.getEvents().trigger("playSoundWithVolume", "effect", 0.8f);
         verify(mockSound).play(0.8f);

source/core/src/test/com/csse3200/game/services/AudioServiceTest.java

@@ -61,7 +61,7 @@ void shouldPlayMusic() {
 
         audioService.playMusic("testMusic", true);
 
-        verify(mockMusic).setVolume(0.5f);
+        verify(mockMusic).setVolume(audioService.getMusicVolume());
         verify(mockMusic).setLooping(true);
         verify(mockMusic).play();
     }
@@ -84,7 +84,7 @@ void shouldPlaySound() {
 
         audioService.playSound("testSound");
 
-        verify(mockSound).play(0.5f);
+        verify(mockSound).play(audioService.getSoundVolume());
     }
 
     @Test