Added BackstagePassItemUpdateService test

go/services/backstage_pass_item_update_service_test.go

@@ -0,0 +1,74 @@
+package services
+
+import (
+    "testing"
+    "github.com/stretchr/testify/assert"
+
+    "github.com/emilybache/gildedrose-refactoring-kata/models"
+)
+
+// BackstagePass item quality increments +1 >10 days before sellIn
+func TestBackstagePassItemUpdateService_QualityBeforeSellIn(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Backstage passes to a TAFKAL80ETC concert", 20, 5})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, 6, item.Model.Quality)
+    })
+}
+
+// BackstagePass item quality increments +2 10 days before sellIn
+func TestBackstagePassItemUpdateService_QualityBeforeSellIn10Days(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Backstage passes to a TAFKAL80ETC concert", 10, 5})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, 7, item.Model.Quality)
+    })
+}
+
+// BackstagePass item quality increments +3 5 days before sellIn
+func TestBackstagePassItemUpdateService_QualityBeforeSellIn5Days(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Backstage passes to a TAFKAL80ETC concert", 5, 5})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, 8, item.Model.Quality)
+    })
+}
+
+// If the sellIn date has been passed, the BackstagePass item quality is 0
+func TestBackstagePassItemUpdateService_QualityAfterSellIn0Days(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Backstage passes to a TAFKAL80ETC concert", 0, 5})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, 0, item.Model.Quality)
+    })
+}
+
+// If the sellIn date has been passed, the BackstagePass item quality is still 0
+func TestBackstagePassItemUpdateService_QualityAfterSellIn4Days(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Backstage passes to a TAFKAL80ETC concert", -4, 5})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, 0, item.Model.Quality)
+    })
+}
+
+// sellIn date must decrease
+func TestBackstagePassItemUpdateService_SellInIsDecreased(t *testing.T) {
+    runTestCase(t, func(
+        backstagePassItemUpdateService BackstagePassItemUpdateService,
+    ) {
+        item := models.NewItem(&models.ItemModel{"Random normal item", -4, 0})
+        backstagePassItemUpdateService.UpdateQuality(item)
+        assert.Equal(t, -5, item.Model.SellIn)
+    })
+}