navidrome/ui/src/setupTests.js

// jest-dom adds custom jest matchers for asserting on DOM nodes.
// allows you to do things like:
// expect(element).toHaveTextContent(/react/i)
// learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom'

const localStorageMock = (function () {
  let store = {}

  return {
    getItem: function (key) {
      return store[key] || null
    },
    setItem: function (key, value) {
      store[key] = value.toString()
    },
    removeItem: function (key) {
      delete store[key]
    },
    clear: function () {
      store = {}
    },
  }
})()

Object.defineProperty(window, 'localStorage', {
  value: localStorageMock,
})

localStorage.setItem('username', 'admin')