修复(#81): 修复永久订阅回归促销误判

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/common/promoEligibility_test.go

@@ -2,8 +2,13 @@ package common
 
 import (
 	"context"
+	"strings"
 	"testing"
 	"time"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
 )
 
 type fakePromoEligibilitySource struct {
@@ -148,3 +153,26 @@ func TestEvaluatePromoInactiveUser(t *testing.T) {
 		t.Fatal("inactive promo should require positive inactive_months")
 	}
 }
+
+func TestLastSubscribeExpireAtIncludesUnlimitedSubscription(t *testing.T) {
+	db, err := gorm.Open(mysql.New(mysql.Config{
+		DSN:                       "gorm:password@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local",
+		SkipInitializeWithVersion: true,
+	}), &gorm.Config{
+		DryRun:               true,
+		DisableAutomaticPing: true,
+		Logger:               logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		t.Fatalf("open gorm db: %v", err)
+	}
+
+	stmt := lastSubscribeExpireQuery(db, 10).Take(nil).Statement
+	sql := strings.ToLower(stmt.SQL.String())
+	if strings.Contains(sql, "expire_time <>") || strings.Contains(sql, "expire_time !=") {
+		t.Fatalf("last subscribe query should include unlimited subscription, sql: %s", stmt.SQL.String())
+	}
+	if !strings.Contains(sql, "case when expire_time = ? then 0 else 1 end asc") {
+		t.Fatalf("last subscribe query should prioritize unlimited subscription, sql: %s", stmt.SQL.String())
+	}
+}