go: calculateAveragePrice 테스트 추가

Author: KubrickCode

src/go/apps/auction-item-stat-scraper/converter/util_test.go

@@ -0,0 +1,47 @@
+package converter
+
+import (
+	"testing"
+
+	"github.com/KubrickCode/loa-work/src/go/libs/loadb"
+	"github.com/shopspring/decimal"
+)
+
+func TestCalculateAveragePrice(t *testing.T) {
+	tests := []struct {
+		name     string
+		stats    []loadb.AuctionItemStat
+		expected decimal.Decimal
+	}{
+		{
+			name: "정상적인 가격",
+			stats: []loadb.AuctionItemStat{
+				{BuyPrice: 100},
+				{BuyPrice: 200},
+				{BuyPrice: 300},
+			},
+			expected: decimal.NewFromInt(200),
+		},
+		{
+			name:     "빈 배열",
+			stats:    []loadb.AuctionItemStat{},
+			expected: decimal.NewFromInt(0),
+		},
+		{
+			name: "하나의 가격",
+			stats: []loadb.AuctionItemStat{
+				{BuyPrice: 150},
+			},
+			expected: decimal.NewFromInt(150),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := calculateAveragePrice(tt.stats)
+			if !result.Equal(tt.expected) {
+				t.Errorf("expected %s, got %s", tt.expected.String(), result.String())
+			}
+		})
+	}
+}