优化结构

internal/integration/payment/vendor_test.go

@@ -56,3 +56,23 @@ func TestVendorRefundMapsBusinessFailureStatus(t *testing.T) {
 		t.Fatalf("Refund() result = %#v, want failed status", result)
 	}
 }
+
+func TestVendorRefundRejectsUnknownBusinessStatus(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"status":"UNKNOWN"}`))
+	}))
+	defer server.Close()
+
+	adapter := &vendorPaymentAdapter{provider: "vendor", profile: vendorSFT}
+	result, err := adapter.Refund(context.Background(), &bizpayment.PaymentRefundRequest{TradeNo: "trade-1", RefundNo: "refund-1", Amount: 100, TotalAmount: 100, Currency: "CNY"}, map[string]any{
+		"refund_url": server.URL,
+		"app_key":    "secret",
+	})
+	if err == nil || !strings.Contains(err.Error(), "状态无法识别") {
+		t.Fatalf("Refund() error = %v, want unknown-status error", err)
+	}
+	if result != nil {
+		t.Fatalf("Refund() result = %#v, want nil", result)
+	}
+}