add another item pickup test

tests/test_item_pickup.rs

@@ -679,3 +679,71 @@ async fn test_meseta_caps_at_999999_when_trying_to_pick_up_more() {
     let floor_meseta = ship.item_manager.get_floor_item_by_id(&char1, ClientItemId(0xF0000001));
     assert!(floor_meseta.is_err());
 }
+
+#[async_std::test]
+async fn test_player_drops_partial_stack_and_other_player_picks_it_up() {
+    let mut entity_gateway = InMemoryGateway::new();
+
+    let (_user1, char1) = new_user_character(&mut entity_gateway, "a1", "a").await;
+    let (_user2, char2) = new_user_character(&mut entity_gateway, "a2", "a").await;
+
+    for _ in 0..5 {
+        entity_gateway.create_item(
+            item::NewItemEntity {
+                item: item::ItemDetail::Tool(
+                    item::tool::Tool {
+                        tool: item::tool::ToolType::Monomate,
+                    }
+                ),
+                location: item::ItemLocation::Inventory {
+                    character_id: char1.id,
+                    slot: 0,
+                    equipped: false,
+                }
+            }).await;
+    }
+
+    let mut ship = ShipServerState::new(entity_gateway.clone());
+    log_in_char(&mut ship, ClientId(1), "a1", "a").await;
+    log_in_char(&mut ship, ClientId(2), "a2", "a").await;
+
+    join_lobby(&mut ship, ClientId(1)).await;
+    join_lobby(&mut ship, ClientId(2)).await;
+
+    create_room(&mut ship, ClientId(1), "room", "").await;
+    join_room(&mut ship, ClientId(2), 0).await;
+
+    ship.handle(ClientId(1), &RecvShipPacket::Message(Message::new(GameMessage::DropCoordinates(DropCoordinates {
+        client: 0,
+        target: 0,
+        item_id: 0x10000,
+        map_area: 0,
+        x: 0.0,
+        z: 0.0,
+    })))).await.unwrap().for_each(drop);
+
+    ship.handle(ClientId(1), &RecvShipPacket::Message(Message::new(GameMessage::PlayerSplitItemStack(PlayerSplitItemStack {
+        client: 0,
+        target: 0,
+        item_id: 0x10000,
+        amount: 2,
+    })))).await.unwrap().for_each(drop);
+
+    ship.handle(ClientId(2), &RecvShipPacket::DirectMessage(DirectMessage::new(0, GameMessage::PickupItem(PickupItem {
+        client: 0,
+        target: 0,
+        item_id: 0xF0000001,
+        area: 0,
+        unknown: [0; 3]
+    })))).await.unwrap().for_each(drop);
+
+    let p1_inventory = ship.item_manager.get_character_inventory(&char1).unwrap();
+    assert!(p1_inventory.count() == 1);
+    let inventory_item = p1_inventory.slot(0).unwrap();
+    assert!(inventory_item.item == HeldItemType::Stacked(item::tool::Tool {tool: item::tool::ToolType::Monomate}, 3));
+
+    let p2_inventory = ship.item_manager.get_character_inventory(&char2).unwrap();
+    assert!(p2_inventory.count() == 1);
+    let inventory_item = p2_inventory.slot(0).unwrap();
+    assert!(inventory_item.item == HeldItemType::Stacked(item::tool::Tool {tool: item::tool::ToolType::Monomate}, 2));
+}