frontend/src/test/setup.ts

import '@testing-library/jest-dom/vitest'
import { beforeEach } from 'vitest'

function createStorageMock(): Storage {
  const store = new Map<string, string>()

  return {
    getItem(key: string) {
      return store.has(key) ? store.get(key)! : null
    },
    setItem(key: string, value: string) {
      store.set(String(key), String(value))
    },
    removeItem(key: string) {
      store.delete(String(key))
    },
    clear() {
      store.clear()
    },
    key(index: number) {
      return Array.from(store.keys())[index] ?? null
    },
    get length() {
      return store.size
    }
  }
}

function ensureStorage(name: 'localStorage' | 'sessionStorage'): Storage {
  const current = window[name]
  if (current && typeof current.getItem === 'function' && typeof current.setItem === 'function') {
    return current
  }

  const storage = createStorageMock()
  Object.defineProperty(window, name, {
    value: storage,
    configurable: true
  })
  Object.defineProperty(globalThis, name, {
    value: storage,
    configurable: true
  })
  return storage
}

const localStorageMock = ensureStorage('localStorage')
const sessionStorageMock = ensureStorage('sessionStorage')

beforeEach(() => {
  localStorageMock.clear()
  sessionStorageMock.clear()
})