Failing test for ignored suppressHydrationWarning using hydrateRoot

packages/react-dom/src/__tests__/ReactDOMServerIntegrationReconnecting-test.js

@@ -13,17 +13,21 @@ const ReactDOMServerIntegrationUtils = require('./utils/ReactDOMServerIntegratio
 
 let React;
 let ReactDOM;
+let ReactDOMClient;
 let ReactDOMServer;
 let ReactTestUtils;
+let act;
 
 function initModules() {
   // Reset warning cache.
   jest.resetModuleRegistry();
 
   React = require('react');
   ReactDOM = require('react-dom');
+  ReactDOMClient = require('react-dom/client');
   ReactDOMServer = require('react-dom/server');
   ReactTestUtils = require('react-dom/test-utils');
+  act = require('jest-react').act;
 
   // Make them available to the helpers.
   return {
@@ -357,6 +361,30 @@ describe('ReactDOMServerIntegration', () => {
           <div>{''}</div>,
         ));
 
+      it('can explicitly ignore reconnecting new children', async () => {
+        const container = document.createElement('div');
+        container.innerHTML = ReactDOMServer.renderToString(
+          <div suppressHydrationWarning={true}>{null}</div>,
+        );
+
+        const recoverableErrors = [];
+        act(() => {
+          ReactDOMClient.hydrateRoot(
+            container,
+            <div suppressHydrationWarning={true}>
+              <p>Hello, Dave!</p>
+            </div>,
+            {
+              onRecoverableError: error => {
+                recoverableErrors.push(error);
+              },
+            },
+          );
+        });
+
+        expect(recoverableErrors).toEqual([]);
+      });
+
       it('can explicitly ignore reconnecting more children', () =>
         expectMarkupMatch(
           <div>

packages/react-dom/src/__tests__/utils/ReactDOMServerIntegrationTestUtils.js

@@ -384,5 +384,7 @@ module.exports = function(initModules) {
     clientRenderOnServerString,
     renderIntoDom,
     streamRender,
+    ReactDOMServer,
+    ReactDOM,
   };
 };