src/main/java/Inventory/Inventory.java

@@ -47,8 +47,8 @@ public class Inventory {
 
      public int getCurrentWeight() {
         int  currentWeight = 0;
-        for (ItemStack item : items) {
+        for (ItemStack stack : items) {
-            currentWeight += item.getItem().getWeight();
+            currentWeight += stack.getWeight();
         }
         return currentWeight;
     }

src/test/java/InventoryTest.java

@@ -59,4 +59,20 @@ public class InventoryTest {
 
         ));
     }
+
+    @Test
+    void current_weight_is_zero_if_no_item_is_added() {
+        var inventory = new Inventory(5);
+        assertThat(inventory.getCurrentWeight(), is(0));
+    }
+
+    @Test
+    void current_weight_calculates_correctly() {
+        var inventory = new Inventory(10);
+        var item = new BasicItem("iron_sword", "Iron Sword", 5);
+        var item2 = new BasicItem("berry", "Berry", 1);
+        inventory.addItem(new ItemStack(item, 1));
+        inventory.addItem(new ItemStack(item2, 2));
+        assertThat(inventory.getCurrentWeight(), is(7));
+    }
 }

src/test/java/LootTableTest.java

@@ -42,5 +42,4 @@ public class LootTableTest {
         assertThat(result, equalTo("Iron"));
     }
 
-
 }