fix: remove redundant timer, add navigation verification to CartSnackbar tests

client/src/shared/ui/CartSnackbar.tsx

@@ -1,4 +1,3 @@
-import { useEffect } from 'react'
 import Alert from '@mui/material/Alert'
 import Button from '@mui/material/Button'
 import Snackbar from '@mui/material/Snackbar'
@@ -10,13 +9,10 @@ export function CartSnackbar() {
   const open = useUnit($cartSnackOpen)
   const navigate = useNavigate()
 
-  useEffect(() => {
-    if (!open) return
-    const timer = setTimeout(() => cartDismissed(), 4000)
-    return () => clearTimeout(timer)
-  }, [open])
-
-  const handleClose = () => cartDismissed()
+  const handleClose = (_event: React.SyntheticEvent | Event, reason?: string) => {
+    if (reason === 'clickaway') return
+    cartDismissed()
+  }
 
   const handleGoToCart = () => {
     cartDismissed()

client/src/shared/ui/__tests__/CartSnackbar.test.tsx

@@ -1,12 +1,19 @@
 import { render, screen, fireEvent, act } from '@testing-library/react'
 import { describe, it, expect, vi } from 'vitest'
-import { MemoryRouter } from 'react-router-dom'
+import { MemoryRouter, useLocation } from 'react-router-dom'
 import { cartAdded, cartDismissed } from '@/shared/model/cart-notifications'
 import { CartSnackbar } from '@/shared/ui/CartSnackbar'
 
+function LocationSpy() {
+  const location = useLocation()
+  ;(window as any).__testLocation = location
+  return null
+}
+
 function renderWithRouter() {
   render(
-    <MemoryRouter>
+    <MemoryRouter initialEntries={['/']}>
+      <LocationSpy />
       <CartSnackbar />
     </MemoryRouter>,
   )
@@ -50,6 +57,7 @@ describe('CartSnackbar', () => {
     cartAdded()
     const goBtn = screen.getByRole('button', { name: /перейти в корзину/i })
     fireEvent.click(goBtn)
+    expect((window as any).__testLocation.pathname).toBe('/cart')
     expect(screen.queryByText(/товар добавлен/i)).not.toBeInTheDocument()
   })
 })