jest.setup.js

require('@testing-library/jest-dom');

if (typeof window !== 'undefined') {
  Object.defineProperty(window, 'matchMedia', {
    writable: true,
    value: jest.fn().mockImplementation((query) => ({
      matches: query === '(prefers-color-scheme: dark)',
      media: query,
      onchange: null,
      addListener: jest.fn(),
      removeListener: jest.fn(),
      addEventListener: jest.fn(),
      removeEventListener: jest.fn(),
      dispatchEvent: jest.fn(),
    })),
  });

  const localStorageMock = (() => {
    let store = {};
    return {
      getItem: jest.fn((key) => store[key] ?? null),
      setItem: jest.fn((key, value) => {
        store[key] = value;
      }),
      removeItem: jest.fn((key) => {
        delete store[key];
      }),
      clear: jest.fn(() => {
        store = {};
      }),
    };
  })();

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