removal of python, uses golang testing

internal/handler/budget.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"Engine/internal/model"
 	"Engine/internal/service"
@@ -23,6 +24,13 @@ func (h *BudgetHandler) Create(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, "invalid request body")
 		return
 	}
+
+	errs := req.Valid()
+	if len(errs) > 0 {
+		writeError(w, http.StatusBadRequest, strings.Join(errs, "; "))
+		return
+	}
+
 	budget, err := h.svc.Create(r.Context(), req)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err.Error())
@@ -42,6 +50,13 @@ func (h *BudgetHandler) Update(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, "invalid request body")
 		return
 	}
+
+	errs := req.Valid()
+	if len(errs) > 0 {
+		writeError(w, http.StatusBadRequest, strings.Join(errs, "; "))
+		return
+	}
+
 	budget, err := h.svc.Update(r.Context(), id, req)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err.Error())