fix version 1

pkgs/ecmall/internal/server/server_test.go

@@ -3,6 +3,7 @@ package server
 import (
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/gin-gonic/gin"
@@ -22,3 +23,38 @@ func TestHTTPRouterIsAvailable(t *testing.T) {
 		t.Fatalf("unexpected status: %d", response.Code)
 	}
 }
+
+// TestGatewayDispatchKeepsBusinessNotFound 守住 404 分流：网关未命中路由才回退 Gin，
+// 业务 handler 返回的 404 必须原样透出，不能被 Gin 的纯文本 404 覆盖。
+func TestGatewayDispatchKeepsBusinessNotFound(t *testing.T) {
+	srv, err := New("0123456789abcdef0123456789abcdef", 3600, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := srv.Gateway.HandlePath(http.MethodPost, "/demo.Thing/Get", func(w http.ResponseWriter, _ *http.Request, _ map[string]string) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNotFound)
+		_, _ = w.Write([]byte(`{"code":5,"message":"record not found"}`))
+	}); err != nil {
+		t.Fatal(err)
+	}
+	srv.HTTP.POST("/rest/demo/ping", func(c *gin.Context) { c.String(http.StatusOK, "gin") })
+
+	handler := srv.handler()
+
+	t.Run("business not found", func(t *testing.T) {
+		response := httptest.NewRecorder()
+		handler.ServeHTTP(response, httptest.NewRequest(http.MethodPost, "/demo.Thing/Get", nil))
+		if response.Code != http.StatusNotFound || !strings.Contains(response.Body.String(), "record not found") {
+			t.Fatalf("business 404 was overwritten: status=%d body=%s", response.Code, response.Body.String())
+		}
+	})
+
+	t.Run("gateway route miss", func(t *testing.T) {
+		response := httptest.NewRecorder()
+		handler.ServeHTTP(response, httptest.NewRequest(http.MethodPost, "/rest/demo/ping", nil))
+		if response.Code != http.StatusOK || response.Body.String() != "gin" {
+			t.Fatalf("gin fallback failed: status=%d body=%s", response.Code, response.Body.String())
+		}
+	})
+}