实现套餐生效条件覆盖与购买快照

internal/service/package/usage_terms_test.go

@@ -0,0 +1,59 @@
+package packagepkg
+
+import (
+	"testing"
+
+	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/pkg/constants"
+	"go.uber.org/zap"
+)
+
+// TestResolveUsageTerms 验证快照优先、历史完整空值回退和部分缺失拒绝。
+func TestResolveUsageTerms(t *testing.T) {
+	pkg := &model.Package{
+		ExpiryBase:   constants.PackageExpiryBaseFromActivation,
+		CalendarType: constants.PackageCalendarTypeByDay, DurationDays: 30,
+	}
+	usage := &model.PackageUsage{
+		ExpiryBaseSnapshot:     constants.PackageExpiryBaseFromPurchase,
+		CalendarTypeSnapshot:   constants.PackageCalendarTypeNaturalMonth,
+		DurationMonthsSnapshot: 12,
+	}
+	terms, err := ResolveUsageTerms(usage, pkg, zap.NewNop())
+	if err != nil || terms.ExpiryBase != constants.PackageExpiryBaseFromPurchase || terms.DurationMonths != 12 {
+		t.Fatalf("应优先读取不可变快照：%+v, %v", terms, err)
+	}
+
+	before := HistoricalTermsFallbackCount()
+	historical := &model.PackageUsage{Model: usage.Model}
+	terms, err = ResolveUsageTerms(historical, pkg, zap.NewNop())
+	if err != nil || terms.DurationDays != 30 || HistoricalTermsFallbackCount() != before+1 {
+		t.Fatalf("历史空快照应可观测回退：%+v, %v", terms, err)
+	}
+
+	broken := &model.PackageUsage{ExpiryBaseSnapshot: constants.PackageExpiryBaseFromPurchase}
+	if _, err = ResolveUsageTerms(broken, pkg, zap.NewNop()); err == nil {
+		t.Fatal("部分缺失快照必须拒绝")
+	}
+}
+
+// TestResolveUsageTermsKeepsPurchasedTerms 验证购买后修改套餐配置不改变已有使用记录语义。
+func TestResolveUsageTermsKeepsPurchasedTerms(t *testing.T) {
+	usage := &model.PackageUsage{
+		ExpiryBaseSnapshot:   constants.PackageExpiryBaseFromPurchase,
+		CalendarTypeSnapshot: constants.PackageCalendarTypeByDay,
+		DurationDaysSnapshot: 90,
+	}
+	pkg := &model.Package{
+		ExpiryBase:     constants.PackageExpiryBaseFromActivation,
+		CalendarType:   constants.PackageCalendarTypeNaturalMonth,
+		DurationMonths: 1,
+	}
+	terms, err := ResolveUsageTerms(usage, pkg, zap.NewNop())
+	if err != nil {
+		t.Fatalf("读取购买快照失败：%v", err)
+	}
+	if terms.ExpiryBase != constants.PackageExpiryBaseFromPurchase || terms.CalendarType != constants.PackageCalendarTypeByDay || terms.DurationDays != 90 {
+		t.Fatalf("套餐当前配置不应覆盖购买快照：%+v", terms)
+	}
+}