Code Refactoring :Separated expired item quality check and common logic into its own method for clearer code flow

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

@@ -22,15 +22,11 @@ class GildedRose {
 
                     if (item.name.equals("Backstage passes to a TAFKAL80ETC concert")) {
                         if (item.sellIn < 11) {
-                            if (item.quality < 50) {
+                            addQualityWhenWithInLimit(item);
-                                item.quality = item.quality + 1;
-                            }
                         }
 
                         if (item.sellIn < 6) {
-                            if (item.quality < 50) {
+                            addQualityWhenWithInLimit(item);
-                                item.quality = item.quality + 1;
-                            }
                         }
                     }
                 }
@@ -40,25 +36,33 @@ class GildedRose {
 				updateSellInDays(item);
             }
 
-            if (item.sellIn < 0) {
+            updateQualityForExpiredItem(item);
-                if (!item.name.equals("Aged Brie")) {
-                    if (!item.name.equals("Backstage passes to a TAFKAL80ETC concert")) {
-                        if (item.quality > 0) {
-                            if (!item.name.equals("Sulfuras, Hand of Ragnaros")) {
-                                item.quality = item.quality - 1;
-                            }
-                        }
-                    } else {
-                        item.quality = item.quality - item.quality;
-                    }
-                } else {
-                    if (item.quality < 50) {
-                        item.quality = item.quality + 1;
-                    }
-                }
-            }
         }
     }
+
+	private void addQualityWhenWithInLimit(Item item) {
+		if (item.quality < 50) {
+		    item.quality = item.quality + 1;
+		}
+	}
+
+	private void updateQualityForExpiredItem(Item item) {
+		if (item.sellIn < 0) {
+		    if (!item.name.equals("Aged Brie")) {
+		        if (!item.name.equals("Backstage passes to a TAFKAL80ETC concert")) {
+		            if (item.quality > 0) {
+		                if (!item.name.equals("Sulfuras, Hand of Ragnaros")) {
+		                    item.quality = item.quality - 1;
+		                }
+		            }
+		        } else {
+		            item.quality = item.quality - item.quality;
+		        }
+		    } else {
+		        addQualityWhenWithInLimit(item);
+		    }
+		}
+	}
     
     
 	private void updateSellInDays(Item item) {

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

@@ -1,24 +1,57 @@
 package com.gildedrose;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import java.util.stream.Stream;
+
 class GildedRoseTest {
-	@Test
+	
-	void testUpdateSellInDaysForAgedBrie() {
+	private static Stream<Arguments> getTestItemsForSellInDayCheck() {
-		Item[] items = new Item[] { new Item("Aged Brie", 1, 1) };
+		return Stream.of(
-		GildedRose app = new GildedRose(items);
+				Arguments.of(new Item[] { new Item("Aged Brie", 1, 1) }, 0),
-		app.updateQuality();
+				Arguments.of(new Item[] { new Item("Sulfuras, Hand of Ragnaros", 1, 1) }, 1)
-		assertEquals(0, items[0].sellIn);
+
+		);
 	}
 
-	@Test
+	@ParameterizedTest(name = "Test sellin days for items - {index}")
-	void testUpdateSellInDaysForSulfuras() {
+	@MethodSource("getTestItemsForSellInDayCheck")
-		Item[] items = new Item[] { new Item("Sulfuras, Hand of Ragnaros", 1, 1) };
+	void testUpdateSellInDays(Item[] items, int expectedSellinDays) {
 		GildedRose app = new GildedRose(items);
 		app.updateQuality();
-		assertEquals(1, items[0].sellIn);
+		assertEquals(expectedSellinDays, items[0].sellIn);
+	}
+	
+	private static Stream<Arguments> getTestItemsForQualityCheck() {
+		return Stream.of(Arguments.of(new Item[] { new Item("Aged Brie", 1, 1) }, 2),
+				Arguments.of(new Item[] { new Item("Aged Brie", 1, 50) }, 50),
+
+				Arguments.of(new Item[] { new Item("Aged Brie", -1, 1) }, 3),
+				Arguments.of(new Item[] { new Item("Aged Brie", -1, 50) }, 50),
+
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 5, 10) }, 13),
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 5, 50) }, 50),
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 10, 10) }, 12),
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 10, 50) }, 50),
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 12, 10) }, 11),
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", 12, 50) }, 50),
+
+				Arguments.of(new Item[] { new Item("Backstage passes to a TAFKAL80ETC concert", -1, 10) }, 0)
+
+		);
+	}
+
+	@ParameterizedTest(name = "Test quality for non expired and expired items - {index}")
+	@MethodSource("getTestItemsForQualityCheck")
+	void testUpdateQuality(Item[] items, int expectedQuality) {
+		GildedRose app = new GildedRose(items);
+		app.updateQuality();
+		assertEquals(expectedQuality, items[0].quality);
 	}
 
 }