Function act

packages/react-dom/src/__tests__/ReactDOMFizzStatic-test.js:65–97

(callback)

  });

  async function act(callback) {
    await callback();
    // Await one turn around the event loop.
    // This assumes that we'll flush everything we have so far.
    await new Promise(resolve => {
      setImmediate(resolve);
    });
    if (hasErrored) {
      throw fatalError;
    }
    // JSDOM doesn't support stream HTML parser so we need to give it a proper fragment.
    // We also want to execute any scripts that are embedded.
    // We assume that we have now received a proper fragment of HTML.
    const bufferedContent = buffer;
    buffer = '';
    const fakeBody = document.createElement('body');
    fakeBody.innerHTML = bufferedContent;
    while (fakeBody.firstChild) {
      const node = fakeBody.firstChild;
      if (node.nodeName === 'SCRIPT') {
        const script = document.createElement('script');
        script.textContent = node.textContent;
        for (let i = 0; i < node.attributes.length; i++) {
          const attribute = node.attributes[i];
          script.setAttribute(attribute.name, attribute.value);
        }
        fakeBody.removeChild(node);
        container.appendChild(script);
      } else {
        container.appendChild(node);
      }
    }
  }

  function getVisibleChildren(element) {
    const children = [];