frontend/src/setupTests.ts


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import '@testing-library/jest-dom';

// Mock IntersectionObserver
class IntersectionObserver {
  readonly root: Element | null = null;
  readonly rootMargin: string = '';
  readonly thresholds: ReadonlyArray<number> = [];

  constructor(_callback: IntersectionObserverCallback, _options?: IntersectionObserverInit) {
    // nothing
  }

  observe(_target: Element): void {
    // nothing
  }

  unobserve(_target: Element): void {
    // nothing
  }

  disconnect(): void {
    // nothing
  }

  takeRecords(): IntersectionObserverEntry[] {
    return [];
  }
}

Object.defineProperty(window, 'IntersectionObserver', {
  writable: true,
  configurable: true,
  value: IntersectionObserver,
});

Object.defineProperty(globalThis, 'IntersectionObserver', {
  writable: true,
  configurable: true,
  value: IntersectionObserver,
});