Updated backstage passes to default to 0 quality when sellin is 0

src/main/java/com/zipcodewilmington/gildedrose/Inventory.java

                 increaseQualityByTwo(i);
                 if ((items[i].getSellIn() <= 5)) {
                 increaseQualityByOne(i);
-            } } else if ((items[i].getName().equals("Conjured")) || (items[i].getSellIn() == 0)) {
+                }
+                if (items[i].getSellIn() == 0) {
+                    items[i].setQuality(0);
+                }
+            } else if ((items[i].getName().equals("Conjured")) || (items[i].getSellIn() == 0)) {
                 decreaseQualityByTwo(i);
             } else {
                 decreaseQualityByOne(i);

src/test/java/com/zipcodewilmington/gildedrose/InventoryTest.java

     }
 
     @Test
+    public void backstagePasses0DaysUpdateQualityTest(){
+        //Given
+        Item backstagePass = new Item("Backstage Passes", 1, 10);
+        Item[] itemArr = new Item[1];
+        itemArr[0] = backstagePass;
+        Inventory newInv = new Inventory(itemArr);
+        int expected = 0;
+
+        //When
+        newInv.updateSellIn();
+        newInv.updateQuality();
+        newInv.updateSellIn();
+        newInv.updateQuality();
+
+        //Then
+        int actual = backstagePass.getQuality();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
     public void agedBrieUpdateQualityTest(){
         //Given
         Item agedBrie = new Item("Aged Brie", 20, 5);