test(utils): 添加事件驱动模型测试

- 在 sqrt_test.go 中添加了 fastSqr1 测试函数，用于测试事件驱动模型
- 新增了 Event 和 Uint32AsyncEvent 类型用于测试
- 更新了 go.work、go.mod 和

common/utils/event/test_scenarios/factory-request-reply/main_test.go

@@ -0,0 +1,81 @@
+package factory_request_reply
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/badu/bus"
+	"github.com/badu/bus/test_scenarios/factory-request-reply/cart"
+	"github.com/badu/bus/test_scenarios/factory-request-reply/events"
+	"github.com/badu/bus/test_scenarios/factory-request-reply/inventory"
+	"github.com/badu/bus/test_scenarios/factory-request-reply/prices"
+)
+
+var sb strings.Builder
+
+type pricesClientStub struct{}
+
+func (s *pricesClientStub) GetPricesForProduct(ctx context.Context, in *prices.ProductIDRequest) (*prices.ProductPriceResponse, error) {
+	return &prices.ProductPriceResponse{Price: 10.30}, nil
+}
+
+type fakeCloser struct {
+}
+
+func (f *fakeCloser) Close() error {
+	return nil
+}
+
+func OnPricesGRPCClientStubRequest(e *events.PricesGRPCClientRequestEvent) {
+	sb.WriteString("OnPricesGRPCClientStubRequest\n")
+	e.Client = &pricesClientStub{}
+	e.Conn = &fakeCloser{}
+	<-time.After(300 * time.Millisecond)
+	e.Reply()
+}
+
+type inventoryClientStub struct{}
+
+func (s *inventoryClientStub) GetStockForProduct(ctx context.Context, in *inventory.ProductIDRequest) (*inventory.ProductStockResponse, error) {
+	return &inventory.ProductStockResponse{Stock: 200}, nil
+}
+
+func OnInventoryGRPCClientStubRequest(e *events.InventoryGRPCClientRequestEvent) {
+	sb.WriteString("OnInventoryGRPCClientStubRequest\n")
+	e.Client = &inventoryClientStub{}
+	e.Conn = &fakeCloser{}
+	<-time.After(300 * time.Millisecond)
+	e.Reply()
+}
+
+func TestGRPCClientStub(t *testing.T) {
+
+	cartSvc := cart.NewService(&sb)
+
+	bus.Sub(OnInventoryGRPCClientStubRequest)
+	bus.Sub(OnPricesGRPCClientStubRequest)
+
+	err := cartSvc.AddProductToCart(context.Background(), "1")
+	if err != nil {
+		t.Fatalf("error adding product to cart : %#v", err)
+	}
+
+	err = cartSvc.AddProductToCart(context.Background(), "2")
+	if err != nil {
+		t.Fatalf("error adding product to cart : %#v", err)
+	}
+
+	const expecting = "OnInventoryGRPCClientStubRequest\n" +
+		"OnPricesGRPCClientStubRequest\n" +
+		"stock 200.00pcs @ price 10.30$\n" +
+		"OnInventoryGRPCClientStubRequest\n" +
+		"OnPricesGRPCClientStubRequest\n" +
+		"stock 200.00pcs @ price 10.30$\n"
+
+	got := sb.String()
+	if got != expecting {
+		t.Fatalf("expecting :\n%s but got : \n%s", expecting, got)
+	}
+}