Add interpretPacketQueue for testing purpose

src/main/java/net/minestom/server/entity/Player.java

@@ -316,7 +316,7 @@ public class Player extends LivingEntity implements CommandSender, Localizable,
         this.playerConnection.update();
 
         // Process received packets
-        this.packets.drain(packet -> MinecraftServer.getPacketListenerManager().processClientPacket(packet, this));
+        interpretPacketQueue();
 
         super.update(time); // Super update (item pickup/fire management)
 
@@ -1673,6 +1673,13 @@ public class Player extends LivingEntity implements CommandSender, Localizable,
         this.packets.offer(packet);
     }
 
+    @ApiStatus.Internal
+    @ApiStatus.Experimental
+    public void interpretPacketQueue() {
+        // This method is NOT thread-safe
+        this.packets.drain(packet -> MinecraftServer.getPacketListenerManager().processClientPacket(packet, this));
+    }
+
     /**
      * Changes the storage player latency and update its tab value.
      *

src/test/java/net/minestom/server/entity/PlayerHeldIntegrationTest.java

@@ -26,7 +26,7 @@ public class PlayerHeldIntegrationTest {
         assertEquals(0, player.getHeldSlot());
 
         player.addPacketToQueue(new ClientHeldItemChangePacket((short) 1));
-        env.tick();
+        player.interpretPacketQueue();
 
         assertEquals(ItemStack.of(Material.STONE), player.getItemInMainHand());
         assertEquals(1, player.getHeldSlot());