test: add cart-notifications store tests

client/src/shared/model/__tests__/cart-notifications.test.ts

@@ -0,0 +1,23 @@
+import { allSettled, fork } from 'effector'
+import { describe, it, expect } from 'vitest'
+import { $cartSnackOpen, cartAdded, cartDismissed } from '../cart-notifications'
+
+describe('cart-notifications store', () => {
+  it('opens on cartAdded', async () => {
+    const scope = fork()
+    await allSettled(cartAdded, { scope })
+    expect(scope.getState($cartSnackOpen)).toBe(true)
+  })
+
+  it('closes on cartDismissed', async () => {
+    const scope = fork()
+    await allSettled(cartAdded, { scope })
+    await allSettled(cartDismissed, { scope })
+    expect(scope.getState($cartSnackOpen)).toBe(false)
+  })
+
+  it('starts closed by default', () => {
+    const scope = fork()
+    expect(scope.getState($cartSnackOpen)).toBe(false)
+  })
+})