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/extend-expect'

class LocalStorageMock {
  constructor() {
    this.store = {}
  }
  getItem(key) {
    return this.store[key] || null
  }
  setItem(key, value) {
    this.store[key] = String(value)
  }
}

global.localStorage = new LocalStorageMock()
localStorage.setItem('username', 'admin')