diff --git a/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Item.java b/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Item.java
index 8b6cc9f..44fc02d 100644
--- a/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Item.java
+++ b/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Item.java
@@ -12,4 +12,8 @@ public class Item {
 	public boolean inStock() {
 		return availability > 0;
 	}
+	
+	public void updateAvailability(int newAmount) {
+		availability = newAmount;
+	}
 }
diff --git a/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/ItemTest.java b/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/ItemTest.java
index c6467ba..1ba1359 100644
--- a/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/ItemTest.java
+++ b/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/ItemTest.java
@@ -13,4 +13,15 @@ public class ItemTest extends TestCase {
 		// Then
 		assertFalse(notInStock);
 	}
+	
+	public void test_ItemInStock() {
+		// Given
+		Item item = new Item();
+		item.updateAvailability(1);
+		// When
+		boolean inStock = item.inStock();
+		
+		// Then
+		assertTrue(inStock);
+	}
 }