diff --git a/packages/react-dom/src/__tests__/ReactDOMTestSelectors-test.js b/packages/react-dom/src/__tests__/ReactDOMTestSelectors-test.js
index cd7a668246686..65bb49e06a1c8 100644
--- a/packages/react-dom/src/__tests__/ReactDOMTestSelectors-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMTestSelectors-test.js
@@ -11,7 +11,7 @@
 
 describe('ReactDOMTestSelectors', () => {
   let React;
-
+  let createRoot;
   let act;
   let createComponentSelector;
   let createHasPseudoClassSelector;
@@ -23,7 +23,6 @@ describe('ReactDOMTestSelectors', () => {
   let focusWithin;
   let getFindAllNodesFailureDescription;
   let observeVisibleRects;
-  let render;
 
   let container;
 
@@ -31,7 +30,8 @@ describe('ReactDOMTestSelectors', () => {
     jest.resetModules();
 
     React = require('react');
-    act = React.unstable_act;
+
+    act = require('internal-test-utils').act;
 
     if (__EXPERIMENTAL__ || global.__WWW__) {
       const ReactDOM = require('react-dom/unstable_testing');
@@ -46,7 +46,7 @@ describe('ReactDOMTestSelectors', () => {
       getFindAllNodesFailureDescription =
         ReactDOM.getFindAllNodesFailureDescription;
       observeVisibleRects = ReactDOM.observeVisibleRects;
-      render = ReactDOM.render;
+      createRoot = ReactDOM.createRoot;
     }
 
     container = document.createElement('div');
@@ -59,7 +59,7 @@ describe('ReactDOMTestSelectors', () => {
 
   describe('findAllNodes', () => {
     // @gate www || experimental
-    it('should support searching from the document root', () => {
+    it('should support searching from the document root', async () => {
       function Example() {
         return (
           <div>
@@ -68,7 +68,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -79,7 +82,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support searching from the container', () => {
+    it('should support searching from the container', async () => {
       function Example() {
         return (
           <div>
@@ -88,7 +91,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(container, [
         createComponentSelector(Example),
@@ -99,7 +105,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support searching from a previous match if the match had a data-testname', () => {
+    it('should support searching from a previous match if the match had a data-testname', async () => {
       function Outer() {
         return (
           <div data-testname="outer" id="outer">
@@ -112,7 +118,10 @@ describe('ReactDOMTestSelectors', () => {
         return <div data-testname="inner" id="inner" />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       let matches = findAllNodes(container, [
         createComponentSelector(Outer),
@@ -130,7 +139,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should not support searching from a previous match if the match did not have a data-testname', () => {
+    it('should not support searching from a previous match if the match did not have a data-testname', async () => {
       function Outer() {
         return (
           <div id="outer">
@@ -143,7 +152,10 @@ describe('ReactDOMTestSelectors', () => {
         return <div id="inner" />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       const matches = findAllNodes(container, [createComponentSelector(Outer)]);
       expect(matches).toHaveLength(1);
@@ -160,7 +172,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support an multiple component types in the selector array', () => {
+    it('should support an multiple component types in the selector array', async () => {
       function Outer() {
         return (
           <>
@@ -185,7 +197,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       let matches = findAllNodes(document.body, [
         createComponentSelector(Outer),
@@ -214,7 +229,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should find multiple matches', () => {
+    it('should find multiple matches', async () => {
       function Example1() {
         return (
           <div>
@@ -232,13 +247,15 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(
-        <>
-          <Example1 />
-          <Example2 />
-        </>,
-        container,
-      );
+      const root = createRoot(container);
+      await act(() => {
+        root.render(
+          <>
+            <Example1 />
+            <Example2 />
+          </>,
+        );
+      });
 
       const matches = findAllNodes(document.body, [
         createTestNameSelector('match'),
@@ -252,7 +269,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should ignore nested matches', () => {
+    it('should ignore nested matches', async () => {
       function Example() {
         return (
           <div data-testname="match" id="match1">
@@ -261,7 +278,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -272,7 +292,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should enforce the specific order of selectors', () => {
+    it('should enforce the specific order of selectors', async () => {
       function Outer() {
         return (
           <>
@@ -285,7 +305,10 @@ describe('ReactDOMTestSelectors', () => {
         return <div data-testname="match" id="match1" />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       expect(
         findAllNodes(document.body, [
@@ -297,7 +320,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should not search within hidden subtrees', () => {
+    it('should not search within hidden subtrees', async () => {
       const ref1 = React.createRef(null);
       const ref2 = React.createRef(null);
 
@@ -315,7 +338,10 @@ describe('ReactDOMTestSelectors', () => {
         return <div ref={ref2} data-testname="match" />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Outer),
@@ -327,7 +353,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support filtering by display text', () => {
+    it('should support filtering by display text', async () => {
       function Example() {
         return (
           <div>
@@ -339,7 +365,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -350,7 +379,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support filtering by explicit accessibiliy role', () => {
+    it('should support filtering by explicit accessibiliy role', async () => {
       function Example() {
         return (
           <div>
@@ -364,7 +393,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -375,7 +407,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support filtering by explicit secondary accessibiliy role', () => {
+    it('should support filtering by explicit secondary accessibiliy role', async () => {
       const ref = React.createRef();
 
       function Example() {
@@ -389,7 +421,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -400,7 +435,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support filtering by implicit accessibiliy role', () => {
+    it('should support filtering by implicit accessibiliy role', async () => {
       function Example() {
         return (
           <div>
@@ -412,7 +447,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -423,7 +461,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support filtering by implicit accessibiliy role with attributes qualifications', () => {
+    it('should support filtering by implicit accessibiliy role with attributes qualifications', async () => {
       function Example() {
         return (
           <div>
@@ -435,7 +473,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -446,7 +487,7 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should support searching ahead with the has() selector', () => {
+    it('should support searching ahead with the has() selector', async () => {
       function Example() {
         return (
           <div>
@@ -466,7 +507,10 @@ describe('ReactDOMTestSelectors', () => {
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const matches = findAllNodes(document.body, [
         createComponentSelector(Example),
@@ -489,13 +533,16 @@ describe('ReactDOMTestSelectors', () => {
     });
 
     // @gate www || experimental
-    it('should throw if an invalid host root is specified', () => {
+    it('should throw if an invalid host root is specified', async () => {
       const ref = React.createRef();
       function Example() {
         return <div ref={ref} />;
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       expect(() => findAllNodes(ref.current, [])).toThrow(
         'Invalid host root specified. Should be either a React container or a node with a testname attribute.',
@@ -505,7 +552,7 @@ describe('ReactDOMTestSelectors', () => {
 
   describe('getFindAllNodesFailureDescription', () => {
     // @gate www || experimental
-    it('should describe findAllNodes failures caused by the component type selector', () => {
+    it('should describe findAllNodes failures caused by the component type selector', async () => {
       function Outer() {
         return <Middle />;
       }
@@ -516,7 +563,10 @@ describe('ReactDOMTestSelectors', () => {
         return <div data-testname="match" />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       const description = getFindAllNodesFailureDescription(document.body, [
         createComponentSelector(Outer),
@@ -535,7 +585,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return null if findAllNodes was able to find a match', () => {
+    it('should return null if findAllNodes was able to find a match', async () => {
       function Example() {
         return (
           <div>
@@ -544,7 +594,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const description = getFindAllNodesFailureDescription(document.body, [
         createComponentSelector(Example),
@@ -571,7 +624,7 @@ No matching component was found for:
     }
 
     // @gate www || experimental
-    it('should return a single rect for a component that returns a single root host element', () => {
+    it('should return a single rect for a component that returns a single root host element', async () => {
       const ref = React.createRef();
 
       function Example() {
@@ -583,7 +636,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       setBoundingClientRect(ref.current, {
         x: 10,
@@ -605,7 +661,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return a multiple rects for multiple matches', () => {
+    it('should return a multiple rects for multiple matches', async () => {
       const outerRef = React.createRef();
       const innerRef = React.createRef();
 
@@ -621,7 +677,10 @@ No matching component was found for:
         return <div ref={innerRef} />;
       }
 
-      render(<Outer />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Outer />);
+      });
 
       setBoundingClientRect(outerRef.current, {
         x: 10,
@@ -655,7 +714,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return a multiple rects for single match that returns a fragment', () => {
+    it('should return a multiple rects for single match that returns a fragment', async () => {
       const refA = React.createRef();
       const refB = React.createRef();
 
@@ -671,7 +730,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       setBoundingClientRect(refA.current, {
         x: 10,
@@ -705,7 +767,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should merge overlapping rects', () => {
+    it('should merge overlapping rects', async () => {
       const refA = React.createRef();
       const refB = React.createRef();
       const refC = React.createRef();
@@ -720,7 +782,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       setBoundingClientRect(refA.current, {
         x: 10,
@@ -760,7 +825,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should merge some types of adjacent rects (if they are the same in one dimension)', () => {
+    it('should merge some types of adjacent rects (if they are the same in one dimension)', async () => {
       const refA = React.createRef();
       const refB = React.createRef();
       const refC = React.createRef();
@@ -783,7 +848,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // A, B, and C are all adjacent and/or overlapping, with the same height.
       setBoundingClientRect(refA.current, {
@@ -860,7 +928,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should not search within hidden subtrees', () => {
+    it('should not search within hidden subtrees', async () => {
       const refA = React.createRef();
       const refB = React.createRef();
       const refC = React.createRef();
@@ -875,7 +943,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       setBoundingClientRect(refA.current, {
         x: 10,
@@ -917,7 +988,7 @@ No matching component was found for:
 
   describe('focusWithin', () => {
     // @gate www || experimental
-    it('should return false if the specified component path has no matches', () => {
+    it('should return false if the specified component path has no matches', async () => {
       function Example() {
         return <Child />;
       }
@@ -928,7 +999,10 @@ No matching component was found for:
         return null;
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -938,7 +1012,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return false if there are no focusable elements within the matched subtree', () => {
+    it('should return false if there are no focusable elements within the matched subtree', async () => {
       function Example() {
         return <Child />;
       }
@@ -946,7 +1020,10 @@ No matching component was found for:
         return 'not focusable';
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -956,7 +1033,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return false if the only focusable elements are disabled', () => {
+    it('should return false if the only focusable elements are disabled', async () => {
       function Example() {
         return (
           <button disabled={true} style={{width: 10, height: 10}}>
@@ -965,7 +1042,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -974,12 +1054,15 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should return false if the only focusable elements are hidden', () => {
+    it('should return false if the only focusable elements are hidden', async () => {
       function Example() {
         return <button hidden={true}>not clickable</button>;
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -988,7 +1071,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should successfully focus the first focusable element within the tree', () => {
+    it('should successfully focus the first focusable element within the tree', async () => {
       const secondRef = React.createRef(null);
 
       const handleFirstFocus = jest.fn();
@@ -1029,7 +1112,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -1043,7 +1129,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should successfully focus the first focusable element even if application logic interferes', () => {
+    it('should successfully focus the first focusable element even if application logic interferes', async () => {
       const ref = React.createRef(null);
 
       const handleFocus = jest.fn(event => {
@@ -1061,7 +1147,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -1073,7 +1162,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should not focus within hidden subtrees', () => {
+    it('should not focus within hidden subtrees', async () => {
       const secondRef = React.createRef(null);
 
       const handleFirstFocus = jest.fn();
@@ -1116,7 +1205,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       const didFocus = focusWithin(document.body, [
         createComponentSelector(Example),
@@ -1197,14 +1289,17 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should notify a listener when the underlying instance intersection changes', () => {
+    it('should notify a listener when the underlying instance intersection changes', async () => {
       const ref = React.createRef(null);
 
       function Example() {
         return <div ref={ref} />;
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // Stub out the size of the element this test will be observing.
       const rect = {
@@ -1234,7 +1329,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should notify a listener of multiple targets when the underlying instance intersection changes', () => {
+    it('should notify a listener of multiple targets when the underlying instance intersection changes', async () => {
       const ref1 = React.createRef(null);
       const ref2 = React.createRef(null);
 
@@ -1247,7 +1342,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // Stub out the size of the element this test will be observing.
       const rect1 = {
@@ -1311,14 +1409,17 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should stop listening when its disconnected', () => {
+    it('should stop listening when its disconnected', async () => {
       const ref = React.createRef(null);
 
       function Example() {
         return <div ref={ref} />;
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // Stub out the size of the element this test will be observing.
       const rect = {
@@ -1346,7 +1447,7 @@ No matching component was found for:
 
     // This test reuires gating because it relies on the __DEV__ only commit hook to work.
     // @gate www || experimental && __DEV__
-    it('should update which targets its listening to after a commit', () => {
+    it('should update which targets its listening to after a commit', async () => {
       const ref1 = React.createRef(null);
       const ref2 = React.createRef(null);
 
@@ -1363,7 +1464,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // Stub out the size of the element this test will be observing.
       const rect1 = {
@@ -1389,7 +1493,7 @@ No matching component was found for:
         {rect: rect1, ratio: 1},
       ]);
 
-      act(() => increment());
+      await act(() => increment());
 
       const rect2 = {
         x: 110,
@@ -1412,7 +1516,7 @@ No matching component was found for:
         {rect: rect2, ratio: 0.25},
       ]);
 
-      act(() => increment());
+      await act(() => increment());
 
       handleVisibilityChange.mockClear();
 
@@ -1425,7 +1529,7 @@ No matching component was found for:
     });
 
     // @gate www || experimental
-    it('should not observe components within hidden subtrees', () => {
+    it('should not observe components within hidden subtrees', async () => {
       const ref1 = React.createRef(null);
       const ref2 = React.createRef(null);
 
@@ -1438,7 +1542,10 @@ No matching component was found for:
         );
       }
 
-      render(<Example />, container);
+      const root = createRoot(container);
+      await act(() => {
+        root.render(<Example />);
+      });
 
       // Stub out the size of the element this test will be observing.
       const rect1 = {
diff --git a/packages/react-dom/unstable_testing.classic.fb.js b/packages/react-dom/unstable_testing.classic.fb.js
index 2f623787958d3..6dd68f3669dc3 100644
--- a/packages/react-dom/unstable_testing.classic.fb.js
+++ b/packages/react-dom/unstable_testing.classic.fb.js
@@ -7,7 +7,31 @@
  * @flow
  */
 
-export * from './index.classic.fb.js';
+export {
+  createPortal,
+  findDOMNode,
+  flushSync,
+  hydrate,
+  render,
+  unmountComponentAtNode,
+  unstable_batchedUpdates,
+  unstable_createEventHandle,
+  unstable_renderSubtreeIntoContainer,
+  unstable_runWithPriority, // DO NOT USE: Temporarily exposed to migrate off of Scheduler.runWithPriority.
+  useFormStatus,
+  useFormState,
+  prefetchDNS,
+  preconnect,
+  preload,
+  preloadModule,
+  preinit,
+  preinitModule,
+  version,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+} from './index.classic.fb.js';
+
+export {createRoot, hydrateRoot} from './client.js';
+
 export {
   createComponentSelector,
   createHasPseudoClassSelector,
diff --git a/packages/react-dom/unstable_testing.experimental.js b/packages/react-dom/unstable_testing.experimental.js
index 3ed081d85b9b1..b84561272bef3 100644
--- a/packages/react-dom/unstable_testing.experimental.js
+++ b/packages/react-dom/unstable_testing.experimental.js
@@ -7,7 +7,29 @@
  * @flow
  */
 
-export * from './index.experimental.js';
+export {
+  createPortal,
+  findDOMNode,
+  flushSync,
+  hydrate,
+  render,
+  unmountComponentAtNode,
+  unstable_batchedUpdates,
+  unstable_renderSubtreeIntoContainer,
+  useFormStatus,
+  useFormState,
+  prefetchDNS,
+  preconnect,
+  preload,
+  preloadModule,
+  preinit,
+  preinitModule,
+  version,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+} from './index.experimental.js';
+
+export {createRoot, hydrateRoot} from './client.js';
+
 export {
   createComponentSelector,
   createHasPseudoClassSelector,
diff --git a/packages/react-dom/unstable_testing.js b/packages/react-dom/unstable_testing.js
index fdad56d13c77d..9729a427e4aa6 100644
--- a/packages/react-dom/unstable_testing.js
+++ b/packages/react-dom/unstable_testing.js
@@ -7,7 +7,30 @@
  * @flow
  */
 
-export * from './index.js';
+export {
+  createPortal,
+  findDOMNode,
+  flushSync,
+  hydrate,
+  render,
+  unmountComponentAtNode,
+  unstable_batchedUpdates,
+  unstable_createEventHandle,
+  unstable_renderSubtreeIntoContainer,
+  unstable_runWithPriority, // DO NOT USE: Temporarily exposed to migrate off of Scheduler.runWithPriority.
+  useFormStatus,
+  useFormState,
+  prefetchDNS,
+  preconnect,
+  preload,
+  preloadModule,
+  preinit,
+  preinitModule,
+  version,
+} from './index.js';
+
+export {createRoot, hydrateRoot} from './client.js';
+
 export {
   createComponentSelector,
   createHasPseudoClassSelector,
diff --git a/packages/react-dom/unstable_testing.modern.fb.js b/packages/react-dom/unstable_testing.modern.fb.js
index c0a0e45ad79ca..17e78ae012adc 100644
--- a/packages/react-dom/unstable_testing.modern.fb.js
+++ b/packages/react-dom/unstable_testing.modern.fb.js
@@ -7,7 +7,23 @@
  * @flow
  */
 
-export * from './index.modern.fb.js';
+export {
+  createPortal,
+  flushSync,
+  unstable_batchedUpdates,
+  unstable_createEventHandle,
+  useFormStatus,
+  useFormState,
+  prefetchDNS,
+  preconnect,
+  preload,
+  preloadModule,
+  preinit,
+  preinitModule,
+  version,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+} from './index.modern.fb.js';
+export {createRoot, hydrateRoot} from './client.js';
 export {
   createComponentSelector,
   createHasPseudoClassSelector,
diff --git a/packages/react-dom/unstable_testing.stable.js b/packages/react-dom/unstable_testing.stable.js
index b983e17bef9bd..453e8b4fdece7 100644
--- a/packages/react-dom/unstable_testing.stable.js
+++ b/packages/react-dom/unstable_testing.stable.js
@@ -7,4 +7,24 @@
  * @flow
  */
 
-export * from './index.stable.js';
+export {
+  createPortal,
+  findDOMNode,
+  flushSync,
+  hydrate,
+  render,
+  unmountComponentAtNode,
+  unstable_batchedUpdates,
+  unstable_renderSubtreeIntoContainer,
+  useFormStatus,
+  useFormState,
+  prefetchDNS,
+  preconnect,
+  preload,
+  preloadModule,
+  preinit,
+  preinitModule,
+  version,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+} from './index.stable.js';
+export {createRoot, hydrateRoot} from './client.js';