Once the sell by date has passed (<=0), Quality degrades twice as fast

Java/README.md

@@ -10,7 +10,7 @@
 
 # unit tests
 -[x] At the end of each day our system lowers both values for every item
--[ ] Once the sell by date has passed, Quality degrades twice as fast
+-[x] Once the sell by date has passed, Quality degrades twice as fast
 -[ ] The Quality of an item is never negative
 -[ ] "Aged Brie" actually increases in Quality the older it gets
 -[ ] The Quality of an item is never more than 50

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

@@ -17,11 +17,28 @@ public class GildedRoseTest {
     //At the end of each day our system lowers both values for every item
     @Test
     public void shouldLowerBothValues(){
-        Item[] items = new Item[] { TestHelper.getItem("foobar", 1, 1) };
+        Item[] items = new Item[] { TestHelper.getItem("foobar", 2, 2) };
         GildedRose app = new GildedRose(items);
         app.updateQuality();
-        assertEquals(0, app.items[0].quality);
+        assertEquals(1, app.items[0].quality);
+        assertEquals(1, app.items[0].sellIn);
+    }
+
+    //Once the sell by date has passed (<=0), Quality degrades twice as fast
+    @Test
+    public void shouldDowngradeTwiceAsFastAfterSellDate(){
+        Item[] items = new Item[] { TestHelper.getItem("foobar", 1, 5) };
+        GildedRose app = new GildedRose(items);
+
+        //day 1, drop by 1
+        app.updateQuality();
+        assertEquals(4, app.items[0].quality);
         assertEquals(0, app.items[0].sellIn);
+
+        //day 2, drop by 2
+        app.updateQuality();
+        assertEquals(2, app.items[0].quality);
+        assertEquals(-1, app.items[0].sellIn);
     }
 
 }