school_compare/nextjs-app/jest.setup.js

// Learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom';

// Mock Next.js router
jest.mock('next/navigation', () => ({
  useRouter: () => ({
    push: jest.fn(),
    replace: jest.fn(),
    prefetch: jest.fn(),
  }),
  usePathname: () => '/',
  useSearchParams: () => new URLSearchParams(),
}));

// Everything below this line is browser furniture, and this file runs for
// every suite — including the ones that declare `@jest-environment node` to
// test route handlers, where NextRequest needs Fetch API globals jsdom does
// not provide. There is no `window` there, so guard rather than assume one.
if (typeof window !== 'undefined') {

// Mock window.matchMedia
Object.defineProperty(window, 'matchMedia', {
  writable: true,
  value: jest.fn().mockImplementation((query) => ({
    matches: false,
    media: query,
    onchange: null,
    addListener: jest.fn(),
    removeListener: jest.fn(),
    addEventListener: jest.fn(),
    removeEventListener: jest.fn(),
    dispatchEvent: jest.fn(),
  })),
});

// jsdom implements neither of these; the school detail views use both
// (IntersectionObserver for the scroll-spy and the hero-CTA tracker,
// scrollTo for the "back to top" control).
global.IntersectionObserver = class {
  constructor(callback) {
    this.callback = callback;
  }
  observe() {}
  unobserve() {}
  disconnect() {}
  takeRecords() {
    return [];
  }
};

window.scrollTo = jest.fn();

// Mock localStorage
const localStorageMock = {
  getItem: jest.fn(),
  setItem: jest.fn(),
  removeItem: jest.fn(),
  clear: jest.fn(),
};
global.localStorage = localStorageMock;

} // end: browser-only globals