Validierung von Svelte Action Mount- und Destroy-Nebeneffekten mittels Isolierter Ereignissimulation

export function autoFocusAction(node, options = {}) {
  const handleKeyDown = (e) => {
    if (e.key === 'Escape') node.blur();
  };
  window.addEventListener('keydown', handleKeyDown);
  if (options.focusImmediately) node.focus();
  
  return {
    destroy() {
      window.removeEventListener('keydown', handleKeyDown);
    }
  };
}
 
export function testAutoFocusLifecycle(testNode) {
  const actionInstance = autoFocusAction(testNode, { focusImmediately: false });
  const escapeEvent = new KeyboardEvent('keydown', { key: 'Escape', bubbles: true });
  window.dispatchEvent(escapeEvent);
  
  actionInstance.destroy();
  const secondaryEvent = new KeyboardEvent('keydown', { key: 'Escape', bubbles: true });
  return window.dispatchEvent(secondaryEvent);
}