Add regression_test that uses https://github.com/approvals/ApprovalTests.Java to verify the system's output against Golden Master.

When you add JUnit to the classpath to get GildedRoseTest to run, also add ApprovalTests.jar, found in the latest zip @ https://github.com/approvals/ApprovalTests.Java/releases.

Java/com/gildedrose/GildedRoseTest.java

@@ -2,10 +2,18 @@ package com.gildedrose;
 
 import static org.junit.Assert.*;
 
+import org.approvaltests.Approvals;
+import org.approvaltests.reporters.JunitReporter;
+import org.approvaltests.reporters.UseReporter;
 import org.junit.Test;
 
+import java.io.File;
+
+@UseReporter(JunitReporter.class)
 public class GildedRoseTest {
 
+    public static final File OUTPUT_FILE = new File("com/gildedrose/GildedRoseTest.regression_test.received.txt");
+
     @Test
     public void foo() {
         Item[] items = new Item[] { new Item("foo", 0, 0) };
@@ -14,4 +22,9 @@ public class GildedRoseTest {
         assertEquals("fixme", app.items[0].name);
     }
 
+    @Test
+    public void regression_test() throws Exception {
+        TexttestFixture.updateQualityOverTenDays(OUTPUT_FILE);
+        Approvals.verify(OUTPUT_FILE);
+    }
 }

Java/com/gildedrose/GildedRoseTest.regression_test.approved.txt

@@ -0,0 +1,121 @@
+OMGHAI!
+-------- day 0 --------
+name, sellIn, quality
++5 Dexterity Vest, 10, 20
+Aged Brie, 2, 0
+Elixir of the Mongoose, 5, 7
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 15, 200
+Backstage passes to a TAFKAL80ETC concert, 10, 49
+Backstage passes to a TAFKAL80ETC concert, 5, 49
+Conjured Mana Cake, 3, 6
+
+-------- day 1 --------
+name, sellIn, quality
++5 Dexterity Vest, 9, 19
+Aged Brie, 1, 1
+Elixir of the Mongoose, 4, 6
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 14, 200
+Backstage passes to a TAFKAL80ETC concert, 9, 50
+Backstage passes to a TAFKAL80ETC concert, 4, 50
+Conjured Mana Cake, 2, 5
+
+-------- day 2 --------
+name, sellIn, quality
++5 Dexterity Vest, 8, 18
+Aged Brie, 0, 2
+Elixir of the Mongoose, 3, 5
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 13, 200
+Backstage passes to a TAFKAL80ETC concert, 8, 50
+Backstage passes to a TAFKAL80ETC concert, 3, 50
+Conjured Mana Cake, 1, 4
+
+-------- day 3 --------
+name, sellIn, quality
++5 Dexterity Vest, 7, 17
+Aged Brie, -1, 4
+Elixir of the Mongoose, 2, 4
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 12, 200
+Backstage passes to a TAFKAL80ETC concert, 7, 50
+Backstage passes to a TAFKAL80ETC concert, 2, 50
+Conjured Mana Cake, 0, 3
+
+-------- day 4 --------
+name, sellIn, quality
++5 Dexterity Vest, 6, 16
+Aged Brie, -2, 6
+Elixir of the Mongoose, 1, 3
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 11, 200
+Backstage passes to a TAFKAL80ETC concert, 6, 50
+Backstage passes to a TAFKAL80ETC concert, 1, 50
+Conjured Mana Cake, -1, 1
+
+-------- day 5 --------
+name, sellIn, quality
++5 Dexterity Vest, 5, 15
+Aged Brie, -3, 8
+Elixir of the Mongoose, 0, 2
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 10, 200
+Backstage passes to a TAFKAL80ETC concert, 5, 50
+Backstage passes to a TAFKAL80ETC concert, 0, 50
+Conjured Mana Cake, -2, 0
+
+-------- day 6 --------
+name, sellIn, quality
++5 Dexterity Vest, 4, 14
+Aged Brie, -4, 10
+Elixir of the Mongoose, -1, 0
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 9, 200
+Backstage passes to a TAFKAL80ETC concert, 4, 50
+Backstage passes to a TAFKAL80ETC concert, -1, 0
+Conjured Mana Cake, -3, 0
+
+-------- day 7 --------
+name, sellIn, quality
++5 Dexterity Vest, 3, 13
+Aged Brie, -5, 12
+Elixir of the Mongoose, -2, 0
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 8, 200
+Backstage passes to a TAFKAL80ETC concert, 3, 50
+Backstage passes to a TAFKAL80ETC concert, -2, 0
+Conjured Mana Cake, -4, 0
+
+-------- day 8 --------
+name, sellIn, quality
++5 Dexterity Vest, 2, 12
+Aged Brie, -6, 14
+Elixir of the Mongoose, -3, 0
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 7, 200
+Backstage passes to a TAFKAL80ETC concert, 2, 50
+Backstage passes to a TAFKAL80ETC concert, -3, 0
+Conjured Mana Cake, -5, 0
+
+-------- day 9 --------
+name, sellIn, quality
++5 Dexterity Vest, 1, 11
+Aged Brie, -7, 16
+Elixir of the Mongoose, -4, 0
+Sulfuras, Hand of Ragnaros, 0, 80
+Sulfuras, Hand of Ragnaros, -1, 80
+Backstage passes to a TAFKAL80ETC concert, 6, 200
+Backstage passes to a TAFKAL80ETC concert, 1, 50
+Backstage passes to a TAFKAL80ETC concert, -4, 0
+Conjured Mana Cake, -6, 0
+

Java/com/gildedrose/TexttestFixture.java

@@ -1,8 +1,22 @@
 package com.gildedrose;
 
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.PrintStream;
+
 public class TexttestFixture {
     public static void main(String[] args) {
-        System.out.println("OMGHAI!");
+        int days = getDays(args);
+        updateQuality(days, System.out);
+    }
+
+    public static void updateQualityOverTenDays(File outputFile) throws FileNotFoundException {
+        int days = 10;
+        updateQuality(days, new PrintStream(outputFile));
+    }
+
+    private static void updateQuality(int days, PrintStream out) {
+        out.println("OMGHAI!");
 
         Item[] items = new Item[] {
                 new Item("+5 Dexterity Vest", 10, 20), //
@@ -10,7 +24,7 @@ public class TexttestFixture {
                 new Item("Elixir of the Mongoose", 5, 7), //
                 new Item("Sulfuras, Hand of Ragnaros", 0, 80), //
                 new Item("Sulfuras, Hand of Ragnaros", -1, 80),
-                new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+                new Item("Backstage passes to a TAFKAL80ETC concert", 15, 200),
                 new Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
                 new Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
                 // this conjured item does not work properly yet
@@ -18,20 +32,22 @@ public class TexttestFixture {
 
         GildedRose app = new GildedRose(items);
 
-        int days = 2;
-        if (args.length > 0) {
-            days = Integer.parseInt(args[0]) + 1;
-        }
-
         for (int i = 0; i < days; i++) {
-            System.out.println("-------- day " + i + " --------");
-            System.out.println("name, sellIn, quality");
+            out.println("-------- day " + i + " --------");
+            out.println("name, sellIn, quality");
             for (Item item : items) {
-                System.out.println(item);
+                out.println(item);
             }
-            System.out.println();
+            out.println();
             app.updateQuality();
         }
     }
 
+    private static int getDays(String[] args) {
+        int days = 2;
+        if (args.length > 0) {
+            days = Integer.parseInt(args[0]) + 1;
+        }
+        return days;
+    }
 }