Backstage passes unit test

Java/README.md

@@ -16,8 +16,8 @@
 -[x] The Quality of an item is never more than 50
 -[x] "Sulfuras", being a legendary item, never has to be sold or decreases in Quality
 -[x] "Backstage passes", like aged brie, increases in Quality as its SellIn value approaches;
--[ ] Quality increases by 2 when there are 10 days or less and by 3 when there are 5 days or less but
+    -[x] Quality increases by 2 when there are 10 days or less and by 3 when there are 5 days or less but
--[ ] Quality drops to 0 after the concert
+    -[x] Quality drops to 0 after the concert
 -[ ] an item can never have its Quality increase above 50, however "Sulfuras" is a legendary item and as such its Quality is 80 and it never alters.
 
 ## Technical Issues, with a balanced priority

Java/src/test/java/com/gildedrose/GildedRoseTest.java

@@ -3,6 +3,7 @@ package com.gildedrose;
 import static org.junit.jupiter.api.Assertions.*;
 
 import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 public class GildedRoseTest {
@@ -108,7 +109,7 @@ public class GildedRoseTest {
 
     @Test
     @DisplayName("\"Backstage passes\", like aged brie, increases in Quality as its SellIn value approaches")
-    public void shouldDo(){
+    public void shouldIncreaseQualityForBrieWhenSellInReduces() {
         Item[] items = new Item[]{TestHelper.getItem("Backstage passes to a TAFKAL80ETC concert", 5, 10)};
         GildedRose app = new GildedRose(items);
 
@@ -123,4 +124,40 @@ public class GildedRoseTest {
         assertEquals(3, app.items[0].sellIn);
     }
 
+    @Nested
+    @DisplayName("Backstage passes")
+    class BaskstagePasses{
+        @Test
+        @DisplayName("Quality increases by 2 when there are 10 days or less and by 3 when there are 5 days or less but")
+        public void shouldIncreaseQualityBasedOnSellIn() {
+            Item[] items = new Item[]{
+                    TestHelper.getItem("Backstage passes to a TAFKAL80ETC concert", 10, 10),
+                    TestHelper.getItem("Backstage passes to a TAFKAL80ETC concert", 5, 10)
+            };
+            GildedRose app = new GildedRose(items);
+
+            app.updateQuality();
+            assertEquals(12, app.items[0].quality);
+            assertEquals(9, app.items[0].sellIn);
+
+            assertEquals(13, app.items[1].quality);
+            assertEquals(4, app.items[1].sellIn);
+        }
+
+        @Test
+        @DisplayName("Quality drops to 0 after the concert")
+        public void shouldHaveQualityDroppingToZeroAfterConcert(){
+            Item[] items = new Item[]{
+                    TestHelper.getItem("Backstage passes to a TAFKAL80ETC concert", 0, 10)
+            };
+
+            GildedRose app = new GildedRose(items);
+
+            app.updateQuality();
+            assertEquals(0, app.items[0].quality);
+            assertEquals(-1, app.items[0].sellIn);
+        }
+    }
+
+
 }