优化结构

internal/biz/payment/payment_test.go

@@ -157,6 +157,33 @@ func testBizPaymentOrder() *PaymentOrder {
 	return &PaymentOrder{Provider: PaymentAlipay, TradeNo: "order-1", BusinessType: "game_item", BusinessID: "item-1", Subject: "item", Amount: 100, Currency: "CNY", PaymentStatus: PaymentStatusPending, FulfillmentStatus: FulfillmentStatusPending, RefundStatus: RefundStatusNone, ConfirmationID: "11111111-1111-1111-1111-111111111111"}
 }
 
+func TestDemoPaymentOperationsNeverReachExternalProviderOrFulfillment(t *testing.T) {
+	repo := &paymentRepoStub{query: successPaymentResult(), refund: successPaymentResult()}
+	order := testBizPaymentOrder()
+	order.TradeNo = "DEMO-PAY-01"
+	order.BusinessType = DemoBusinessType
+	order.PaymentStatus = PaymentStatusPaid
+	orders := &paymentOrderRepoStub{order: order}
+	registry := NewPaymentFulfillmentRegistry()
+	handler := &paymentFulfillmentStub{}
+	if err := registry.Register(handler); err != nil {
+		t.Fatal(err)
+	}
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	uc := NewPaymentUsecase(repo, orders, nil, nil, registry, logger)
+
+	result, err := uc.Query(context.Background(), order.Provider, order.TradeNo)
+	if err != nil || result == nil || repo.queryCalls != 0 {
+		t.Fatalf("demo query result=%#v calls=%d err=%v", result, repo.queryCalls, err)
+	}
+	if _, err = uc.Refund(context.Background(), order.Provider, order.TradeNo, 10); err == nil || repo.refundedReq != nil {
+		t.Fatalf("demo refund reached provider: req=%#v err=%v", repo.refundedReq, err)
+	}
+	if _, err = uc.Fulfill(context.Background(), order.Provider, order.TradeNo); err == nil || handler.calls != 0 {
+		t.Fatalf("demo fulfillment reached handler: calls=%d err=%v", handler.calls, err)
+	}
+}
+
 func successPaymentResult() *PaymentResult {
 	return &PaymentResult{
 		Provider:        PaymentAlipay,