Add stopSound for specific sound category & unit test for SoundCategory

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -322,15 +322,25 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public void stopSound(Sound sound) {
-        stopSound(CraftSound.getSound(sound));
+        stopSound(sound, null);
     }
 
     @Override
     public void stopSound(String sound) {
+        stopSound(sound, null);
+    }
+
+    @Override
+    public void stopSound(Sound sound, org.bukkit.SoundCategory category) {
+        stopSound(CraftSound.getSound(sound), category);
+    }
+
+    @Override
+    public void stopSound(String sound, org.bukkit.SoundCategory category) {
         if (getHandle().playerConnection == null) return;
         PacketDataSerializer packetdataserializer = new PacketDataSerializer(Unpooled.buffer());
 
-        packetdataserializer.a("");
+        packetdataserializer.a(category == null ? "" : net.minecraft.server.SoundCategory.valueOf(category.name()).a());
         packetdataserializer.a(sound);
         getHandle().playerConnection.sendPacket(new PacketPlayOutCustomPayload("MC|StopSound", packetdataserializer));
     }

src/test/java/org/bukkit/SoundTest.java

@@ -24,4 +24,18 @@ public class SoundTest {
             assertNotNull(effect + "", Sound.valueOf(effect.a().replace('.', '_').toUpperCase(java.util.Locale.ENGLISH)));
         }
     }
+
+    @Test
+    public void testCategory() {
+        for (SoundCategory category : SoundCategory.values()) {
+            assertNotNull(category + "", net.minecraft.server.SoundCategory.valueOf(category.name()));
+        }
+    }
+
+    @Test
+    public void testCategoryReverse() {
+        for (net.minecraft.server.SoundCategory category : net.minecraft.server.SoundCategory.values()) {
+            assertNotNull(category + "", SoundCategory.valueOf(category.name()));
+        }
+    }
 }