Added NormalItemUpdateService tests

go/services/normal_item_update_service_test.go

@@ -0,0 +1,52 @@
+package services
+
+import (
+    "testing"
+    "github.com/stretchr/testify/assert"
+
+    "github.com/emilybache/gildedrose-refactoring-kata/models"
+)
+
+// Normal item quality decrements in 1 after each day
+func TestNormalItemUpdateService_QualityBeforeSellIn(t *testing.T) {
+    runTestCase(t, func(
+        normalItemUpdateService NormalItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Random normal item", 5, 5})
+        normalItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, item.Model.Quality, 4)
+    })
+}
+
+// If the sellIn date has been passed, the Normal item quality decrements in 2
+func TestNormalItemUpdateService_QualityAfterSellIn0Days(t *testing.T) {
+    runTestCase(t, func(
+        normalItemUpdateService NormalItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Random normal item", 0, 5})
+        normalItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, item.Model.Quality, 3)
+    })
+}
+
+// If the sellIn date has been passed, the Normal item quality decrements in 2
+func TestNormalItemUpdateService_QualityAfterSellIn4Days(t *testing.T) {
+    runTestCase(t, func(
+        normalItemUpdateService NormalItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Random normal item", -4, 5})
+        normalItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, item.Model.Quality, 3)
+    })
+}
+
+// Quality must not be lower than 0
+func TestNormalItemUpdateService_QualityNotLowerThan0(t *testing.T) {
+    runTestCase(t, func(
+        agedBrieItemUpdateService AgedBrieItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Random normal item", -4, 0})
+        agedBrieItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, item.Model.Quality, 0)
+    })
+}