`IntersectionObserverMock`

Mock-implementation of IntersectionObserver with ability of simulating intersections programmatically.

Basic usage

import { IntersectionObserverMock } from '@krutoo/utils/testing';

// creating like normal IntersectionObserver
const observer = new IntersectionObserverMock(callback, options);

// using like normal IntersectionObserver
observer.observe(element);
observer.unobserve(element);
observer.disconnect();

// ...somewhere in your tests
observer.simulateIntersection([
  // all entry properties except `target` is optional
  // properties that is not provided will be filled by mocks
  {
    target: document.querySelector('#my-widget'),
    isIntersecting: false,
  },
]);