From e4d684019845cf69f7aa88d19bbd7b65686f40df Mon Sep 17 00:00:00 2001
From: Richard Xu <richard.xu@roadbotics.com>
Date: Thu, 22 Dec 2022 11:39:39 -0500
Subject: [PATCH] Add backstagePasses tests

---
 .../main/java/com/gildedrose/GildedRose.java  |  8 +++--
 .../java/com/gildedrose/GildedRoseTest.java   | 35 +++++++++++++++++++
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/Java/src/main/java/com/gildedrose/GildedRose.java b/Java/src/main/java/com/gildedrose/GildedRose.java
index 4b33e034..338a8d80 100644
--- a/Java/src/main/java/com/gildedrose/GildedRose.java
+++ b/Java/src/main/java/com/gildedrose/GildedRose.java
@@ -3,6 +3,8 @@ package com.gildedrose;
 class GildedRose {
     public static final String AGED_BRIE = "Aged Brie";
     public static final String SULFURAS = "Sulfuras, Hand of Ragnaros";
+    public static final String BACKSTAGE_PASSES = "Backstage passes to a TAFKAL80ETC concert";
+
 
     Item[] items;
 
@@ -13,7 +15,7 @@ class GildedRose {
     public void updateQuality() {
         for (int i = 0; i < items.length; i++) {
             if (!items[i].name.equals(AGED_BRIE)
-                    && !items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                    && !items[i].name.equals(BACKSTAGE_PASSES)) {
                 if (items[i].quality > 0) {
                     if (!items[i].name.equals(SULFURAS)) {
                         items[i].quality = items[i].quality - 1;
@@ -23,7 +25,7 @@ class GildedRose {
                 if (items[i].quality < 50) {
                     items[i].quality = items[i].quality + 1;
 
-                    if (items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                    if (items[i].name.equals(BACKSTAGE_PASSES)) {
                         if (items[i].sellIn < 11) {
                             if (items[i].quality < 50) {
                                 items[i].quality = items[i].quality + 1;
@@ -45,7 +47,7 @@ class GildedRose {
 
             if (items[i].sellIn < 0) {
                 if (!items[i].name.equals(AGED_BRIE)) {
-                    if (!items[i].name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+                    if (!items[i].name.equals(BACKSTAGE_PASSES)) {
                         if (items[i].quality > 0) {
                             if (!items[i].name.equals(SULFURAS)) {
                                 items[i].quality = items[i].quality - 1;
diff --git a/Java/src/test/java/com/gildedrose/GildedRoseTest.java b/Java/src/test/java/com/gildedrose/GildedRoseTest.java
index 46facc69..1c5d364f 100644
--- a/Java/src/test/java/com/gildedrose/GildedRoseTest.java
+++ b/Java/src/test/java/com/gildedrose/GildedRoseTest.java
@@ -44,4 +44,39 @@ class GildedRoseTest {
         app.updateQuality();
         assertEquals(app.items[0].quality, SULFURAS_QUALITY);
     }
+
+    @Test
+    public void backstagePassesQualityIncreasesByTwoWhenThereAreTenDaysOrLessBeforeTheConcert() {
+        int quality = 0;
+        Item[] items = new Item[] { new Item(GildedRose.BACKSTAGE_PASSES, 10, quality) };
+        GildedRose app = new GildedRose(items);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 2);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 4);
+    }
+
+    @Test
+    public void backstagePassesQualityIncreasesByThreeWhenThereAreFiveDaysOrLessBeforeTheConcert() {
+        int quality = 0;
+        Item[] items = new Item[] { new Item(GildedRose.BACKSTAGE_PASSES, 5, quality) };
+        GildedRose app = new GildedRose(items);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 3);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 6);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 9);
+    }
+
+    @Test
+    public void backstagePassesQualityDropsToZeroAfterTheConcert() {
+        int quality = 10;
+        Item[] items = new Item[] { new Item(GildedRose.BACKSTAGE_PASSES, 1, quality) };
+        GildedRose app = new GildedRose(items);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 13);
+        app.updateQuality();
+        assertEquals(app.items[0].quality, 0);
+    }
 }