separate brie update

go/README.md

@@ -18,4 +18,16 @@ go test
 go test -coverprofile=coverage.out
 
 go tool cover -html=coverage.out
-```
+```
+
+- Create golden test file using textest (*nix):
+
+```bash
+go run texttest_fixture.go gilded-rose.go > golden_test.txt 
+```
+
+- Testing changes against the golden test file (*nix):
+
+```bash
+diff <(go run texttest_fixture.go gilded-rose.go) golden_test.txt
+```

go/gilded-rose.go

@@ -5,14 +5,41 @@ type Item struct {
 	sellIn, quality int
 }
 
+func UpdateQualityBrie(item *Item) {
+	defer func() {
+		item.sellIn = item.sellIn - 1
+	}()
+
+	if item.quality == 50 {
+		return
+	}
+	if item.quality == 49 && item.sellIn <= 0 {
+		item.quality = 50
+	}
+	if item.sellIn > 0 {
+		item.quality++
+	}
+	if item.sellIn <= 0 {
+		item.quality += 2
+	}
+
+}
+
 func UpdateQuality(items []*Item) {
 	for i := 0; i < len(items); i++ {
 
-		if items[i].name != "Aged Brie" && items[i].name != "Backstage passes to a TAFKAL80ETC concert" {
+		if items[i].name == "Sulfuras, Hand of Ragnaros" {
+			continue
+		}
+
+		if items[i].name == "Aged Brie" {
+			UpdateQualityBrie(items[i])
+			continue
+		}
+
+		if items[i].name != "Backstage passes to a TAFKAL80ETC concert" {
 			if items[i].quality > 0 {
-				if items[i].name != "Sulfuras, Hand of Ragnaros" {
-					items[i].quality = items[i].quality - 1
-				}
+				items[i].quality = items[i].quality - 1
 			}
 		} else {
 			if items[i].quality < 50 {
@@ -32,17 +59,13 @@ func UpdateQuality(items []*Item) {
 			}
 		}
 
-		if items[i].name != "Sulfuras, Hand of Ragnaros" {
-			items[i].sellIn = items[i].sellIn - 1
-		}
+		items[i].sellIn = items[i].sellIn - 1
 
 		if items[i].sellIn < 0 {
 			if items[i].name != "Aged Brie" {
 				if items[i].name != "Backstage passes to a TAFKAL80ETC concert" {
 					if items[i].quality > 0 {
-						if items[i].name != "Sulfuras, Hand of Ragnaros" {
-							items[i].quality = items[i].quality - 1
-						}
+						items[i].quality = items[i].quality - 1
 					}
 				} else {
 					items[i].quality = items[i].quality - items[i].quality

go/gilded-rose_test.go

@@ -43,7 +43,7 @@ func Test_Items(t *testing.T) {
 	for i, item := range items {
 		actual := [2]int{item.sellIn, item.quality}
 		if actual != expected[i] {
-			t.Errorf("Expected %+v but got %+v", expected[i], actual)
+			t.Errorf("%s: Expected %+v but got %+v", item.name, expected[i], actual)
 		}
 	}