Add regression test

Java/src/main/java/com/gildedrose/TexttestFixture.java

@@ -7,7 +7,7 @@ public class TexttestFixture {
         Item[] items = new Item[] {
                 new Item("+5 Dexterity Vest", 10, 20), //
                 new Item("Aged Brie", 2, 0), //
-                new Item("Elixir of the Mongoose", 5, 7), //
+                new Item("Elixi r 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),

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

@@ -0,0 +1,52 @@
+package com.gildedrose;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class GildedRoseApprovalTest {
+
+    @Test
+    void oneDayRegressionTest() {
+        Item[] items = {
+            new Item("+5 Dexterity Vest", 10, 20),
+            new Item("Aged Brie", 2, 0),
+            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", 10, 49),
+            new Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+            new Item("Conjured Mana Cake", 3, 6)
+        };
+
+        GildedRose app = new GildedRose(items);
+        app.updateQuality(); // simulate day 1
+
+        String result = String.join("\n",
+            items[0].toString(),
+            items[1].toString(),
+            items[2].toString(),
+            items[3].toString(),
+            items[4].toString(),
+            items[5].toString(),
+            items[6].toString(),
+            items[7].toString(),
+            items[8].toString()
+        );
+        System.out.println("result tessssssst\n"+result);
+
+        // Vérifie CORRESPONDANCE EXACTE pour éviter de casser la logique
+        assertEquals(
+            "+5 Dexterity Vest, 9, 19\n" +
+                "Aged Brie, 1, 1\n" +
+                "Elixir of the Mongoose, 4, 6\n" +
+                "Sulfuras, Hand of Ragnaros, 0, 80\n" +
+                "Sulfuras, Hand of Ragnaros, -1, 80\n" +
+                "Backstage passes to a TAFKAL80ETC concert, 14, 21\n" +
+                "Backstage passes to a TAFKAL80ETC concert, 9, 50\n" +
+                "Backstage passes to a TAFKAL80ETC concert, 4, 50\n" +
+                "Conjured Mana Cake, 2, 5",
+            result
+        );
+    }
+}