1. <!DOCTYPE html>

  2. <html>

  3.   <head>

  4.     <title>sanity test for ReactTestUtils.act</title>

  5.   </head>

  6.   <body>

  7.     this page tests whether act runs properly in a browser.

  8.     <br />

  9.     your console should say "5"

  10.     <script src="scheduler-unstable_mock.development.js"></script>

  11.     <script src="react.development.js"></script>

  12.     <script type="text/javascript">

  13.       window.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler =

  14.         window.SchedulerMock;

  15.     </script>

  16.     <script src="react-dom.development.js"></script>

  17.     <script src="react-dom-test-utils.development.js"></script>

  18.     <script>

  19.       // from ReactTestUtilsAct-test.js

  20.       function App() {

  21.         let [state, setState] = React.useState(0);

  22.         async function ticker() {

  23.           await null;

  24.           setState(x => x + 1);

  25.         }

  26.         React.useEffect(() => {

  27.           ticker();

  28.         }, [Math.min(state, 4)]);

  29.         return state;

  30.       }

  31. 

  32.       async function testAsyncAct() {

  33.         const el = document.createElement("div");

  34.         await ReactTestUtils.act(async () => {

  35.           ReactDOM.render(React.createElement(App), el);

  36.         });

  37.         // all 5 ticks present and accounted for

  38.         console.log(el.innerHTML);

  39.       }

  40. 

  41.       testAsyncAct();

  42.     </script>

  43.   </body>

  44. </html>
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