Function focus

packages/dom-event-testing-library/index.js:30–34

(payload)

    node.dispatchEvent(domEvents.click(payload));
  },
  focus(payload) {
    node.dispatchEvent(domEvents.focus(payload));
    node.dispatchEvent(domEvents.focusIn(payload));
    node.focus();
  },
  keydown(payload) {
    node.dispatchEvent(domEvents.keydown(payload));
  },