creates tests

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

@@ -2,16 +2,158 @@ package com.gildedrose;
 
 import static org.junit.Assert.*;
 
+import com.gildedrose.item.Item;
 import org.junit.Test;
 
 public class GildedRoseTest {
 
     @Test
     public void foo() {
-        Item[] items = new Item[] { new Item("foo", 0, 0) };
-        GildedRose app = new GildedRose(items);
+        GildedRose app = newGildedRose("foo", 0, 0);
+
         app.updateQuality();
-        assertEquals("fixme", app.items[0].name);
+
+        assertEquals("foo", app.items[0].name);
     }
 
+    @Test
+    public void standardItemDecreasesSellByDayNumberEachTime() {
+        GildedRose app = newGildedRose("standard item", 0, 0);
+
+        app.updateQuality();
+
+        assertEquals(-1, itemSellByDayNumber(app));
+    }
+
+    @Test
+    public void brieDecreasesSellByDayNumberEachTime() {
+        GildedRose app = newGildedRose("Aged Brie", 0, 0);
+
+        app.updateQuality();
+
+        assertEquals(-1, itemSellByDayNumber(app));
+    }
+
+    @Test
+    public void backstagePassesItemDecreasesSellByDayNumberEachTime() {
+        GildedRose app = newGildedRose("Backstage passes to a TAFKAL80ETC concert", 0, 0);
+
+        app.updateQuality();
+
+        assertEquals(-1, itemSellByDayNumber(app));
+    }
+
+    @Test
+    public void sulfurasItemDoesNotDecreaseSellByDayNumberEachTime() {
+        GildedRose app = newGildedRose("Sulfuras, Hand of Ragnaros", 0, 0);
+
+        app.updateQuality();
+
+        assertEquals(0, itemSellByDayNumber(app));
+    }
+
+    @Test
+    public void brieIncreasesInQualityEachTime() {
+        GildedRose app = newGildedRose("Aged Brie", 1, 1);
+
+        app.updateQuality();
+
+        assertEquals(2, itemQualityNumber(app));
+    }
+
+    @Test
+    public void brieQualityCannotGoAboveFiftyWhenIncreasing() {
+        GildedRose app = newGildedRose("Aged Brie", 1, 49);
+
+        app.updateQuality();
+        app.updateQuality();
+
+        assertEquals(50, itemQualityNumber(app));
+    }
+
+    @Test
+    public void backstagePassesItemDecreasesQualityByOneIfSellByDayMoreThanEleven() {
+        GildedRose app = newGildedRose("Backstage passes to a TAFKAL80ETC concert", 12, 1);
+
+        app.updateQuality();
+
+        assertEquals(2, itemQualityNumber(app));
+    }
+
+    @Test
+    public void backstagePassesItemDecreasesQualityByTwoIfSellByDayLessThanEleven() {
+        GildedRose app = newGildedRose("Backstage passes to a TAFKAL80ETC concert", 10, 1);
+
+        app.updateQuality();
+
+        assertEquals(3, itemQualityNumber(app));
+    }
+
+    @Test
+    public void backstagePassesItemDecreasesQualityByThreeIfSellByDayLessThanSix() {
+        GildedRose app = newGildedRose("Backstage passes to a TAFKAL80ETC concert", 5, 1);
+
+        app.updateQuality();
+
+        assertEquals(4, itemQualityNumber(app));
+    }
+
+    @Test
+    public void backstagePassesItemQualityDropsToZeroIfSellByDayHasPassed() {
+        GildedRose app = newGildedRose("Backstage passes to a TAFKAL80ETC concert", 0,50);
+
+        app.updateQuality();
+
+        assertEquals(0, itemQualityNumber(app));
+    }
+
+    @Test
+    public void normalItemDecreasesQualityByOneIfSellByDayIsAboveZero() {
+       GildedRose app = newGildedRose("foo", 2, 1);
+
+       app.updateQuality();
+
+       assertEquals(0, itemQualityNumber(app));
+    }
+
+    @Test
+    public void normalItemDecreasesQualityByTwoOnceSellByDayHasPassed() {
+        GildedRose app = newGildedRose("foo",0, 5);
+
+        app.updateQuality();
+
+        assertEquals(3, itemQualityNumber(app));
+    }
+
+    @Test
+    public void normalItemCannotHaveQualityBelowZero() {
+        GildedRose app = newGildedRose("foo", 0, 0);
+
+        app.updateQuality();
+
+        assertEquals(0, itemQualityNumber(app));
+    }
+
+    @Test
+    public void nothingHappensToSulfurasItem() {
+        GildedRose app = newGildedRose("Sulfuras, Hand of Ragnaros", 1, 1);
+
+        app.updateQuality();
+
+        assertEquals(1, itemQualityNumber(app));
+        assertEquals(1, itemSellByDayNumber(app));
+    }
+
+    private GildedRose newGildedRose(String itemName, int itemSellIn, int itemQuality) {
+        Item[] items = new Item[] { new Item(itemName, itemSellIn, itemQuality)};
+        return new GildedRose(items);
+    }
+
+    private int itemSellByDayNumber(GildedRose app) {
+        return app.items[0].sellIn;
+    }
+
+    private int itemQualityNumber(GildedRose app) {
+        return app.items[0].quality;
+    }
 }