diff --git a/fixtures/dom/src/__tests__/nested-act-test.js b/fixtures/dom/src/__tests__/nested-act-test.js
index c7a191943abdf..4a39a0ea98f7f 100644
--- a/fixtures/dom/src/__tests__/nested-act-test.js
+++ b/fixtures/dom/src/__tests__/nested-act-test.js
@@ -8,24 +8,21 @@
  */
 
 let React;
-let ReactDOM;
+let DOMAct;
 let TestRenderer;
+let TestAct;
 
 global.__DEV__ = process.env.NODE_ENV !== 'production';
 
-jest.mock('react-dom', () =>
-  require.requireActual('react-dom/cjs/react-dom-testing.development.js')
-);
-// we'll replace the above with react/testing and react-dom/testing right before the next minor
-
 expect.extend(require('../toWarnDev'));
 
 describe('unmocked scheduler', () => {
   beforeEach(() => {
     jest.resetModules();
     React = require('react');
-    ReactDOM = require('react-dom');
+    DOMAct = require('react-dom/test-utils').act;
     TestRenderer = require('react-test-renderer');
+    TestAct = TestRenderer.act;
   });
 
   it('flushes work only outside the outermost act() corresponding to its own renderer', () => {
@@ -37,8 +34,8 @@ describe('unmocked scheduler', () => {
       return null;
     }
     // in legacy mode, this tests whether an act only flushes its own effects
-    TestRenderer.act(() => {
-      ReactDOM.act(() => {
+    TestAct(() => {
+      DOMAct(() => {
         TestRenderer.create(<Effecty />);
       });
       expect(log).toEqual([]);
@@ -47,8 +44,8 @@ describe('unmocked scheduler', () => {
 
     log = [];
     // for doublechecking, we flip it inside out, and assert on the outermost
-    ReactDOM.act(() => {
-      TestRenderer.act(() => {
+    DOMAct(() => {
+      TestAct(() => {
         TestRenderer.create(<Effecty />);
       });
       expect(log).toEqual(['called']);
@@ -64,8 +61,9 @@ describe('mocked scheduler', () => {
       require.requireActual('scheduler/unstable_mock')
     );
     React = require('react');
-    ReactDOM = require('react-dom');
+    DOMAct = require('react-dom/test-utils').act;
     TestRenderer = require('react-test-renderer');
+    TestAct = TestRenderer.act;
   });
 
   afterEach(() => {
@@ -81,8 +79,8 @@ describe('mocked scheduler', () => {
       return null;
     }
     // with a mocked scheduler, this tests whether it flushes all work only on the outermost act
-    TestRenderer.act(() => {
-      ReactDOM.act(() => {
+    TestAct(() => {
+      DOMAct(() => {
         TestRenderer.create(<Effecty />);
       });
       expect(log).toEqual([]);
@@ -91,8 +89,8 @@ describe('mocked scheduler', () => {
 
     log = [];
     // for doublechecking, we flip it inside out, and assert on the outermost
-    ReactDOM.act(() => {
-      TestRenderer.act(() => {
+    DOMAct(() => {
+      TestAct(() => {
         TestRenderer.create(<Effecty />);
       });
       expect(log).toEqual([]);
diff --git a/fixtures/dom/src/__tests__/wrong-act-test.js b/fixtures/dom/src/__tests__/wrong-act-test.js
index 10df65ce6df60..38029be9b9cae 100644
--- a/fixtures/dom/src/__tests__/wrong-act-test.js
+++ b/fixtures/dom/src/__tests__/wrong-act-test.js
@@ -10,6 +10,7 @@
 let React;
 let ReactDOM;
 let ReactART;
+let TestUtils;
 let ARTSVGMode;
 let ARTCurrentMode;
 let TestRenderer;
@@ -18,11 +19,6 @@ let ARTTest;
 global.__DEV__ = process.env.NODE_ENV !== 'production';
 global.__EXPERIMENTAL__ = process.env.RELEASE_CHANNEL === 'experimental';
 
-jest.mock('react-dom', () =>
-  require.requireActual('react-dom/cjs/react-dom-testing.development.js')
-);
-// we'll replace the above with react/testing and react-dom/testing right before the next minor
-
 expect.extend(require('../toWarnDev'));
 
 function App(props) {
@@ -33,6 +29,7 @@ beforeEach(() => {
   jest.resetModules();
   React = require('react');
   ReactDOM = require('react-dom');
+  TestUtils = require('react-dom/test-utils');
   ReactART = require('react-art');
   ARTSVGMode = require('art/modes/svg');
   ARTCurrentMode = require('art/modes/current');
@@ -73,7 +70,7 @@ beforeEach(() => {
 });
 
 it("doesn't warn when you use the right act + renderer: dom", () => {
-  ReactDOM.act(() => {
+  TestUtils.act(() => {
     ReactDOM.render(<App />, document.createElement('div'));
   });
 });
@@ -89,7 +86,7 @@ it('resets correctly across renderers', () => {
     React.useEffect(() => {}, []);
     return null;
   }
-  ReactDOM.act(() => {
+  TestUtils.act(() => {
     TestRenderer.act(() => {});
     expect(() => {
       TestRenderer.create(<Effecty />);
@@ -126,7 +123,7 @@ it('warns when using the wrong act version - test + dom: updates', () => {
 
 it('warns when using the wrong act version - dom + test: .create()', () => {
   expect(() => {
-    ReactDOM.act(() => {
+    TestUtils.act(() => {
       TestRenderer.create(<App />);
     });
   }).toWarnDev(["It looks like you're using the wrong act()"], {
@@ -137,7 +134,7 @@ it('warns when using the wrong act version - dom + test: .create()', () => {
 it('warns when using the wrong act version - dom + test: .update()', () => {
   const root = TestRenderer.create(<App key="one" />);
   expect(() => {
-    ReactDOM.act(() => {
+    TestUtils.act(() => {
       root.update(<App key="two" />);
     });
   }).toWarnDev(["It looks like you're using the wrong act()"], {
@@ -154,14 +151,14 @@ it('warns when using the wrong act version - dom + test: updates', () => {
   }
   TestRenderer.create(<Counter />);
   expect(() => {
-    ReactDOM.act(() => {
+    TestUtils.act(() => {
       setCtr(1);
     });
   }).toWarnDev(["It looks like you're using the wrong act()"]);
 });
 
 it('does not warn when nesting react-act inside react-dom', () => {
-  ReactDOM.act(() => {
+  TestUtils.act(() => {
     ReactDOM.render(<ARTTest />, document.createElement('div'));
   });
 });
@@ -174,7 +171,7 @@ it('does not warn when nesting react-act inside react-test-renderer', () => {
 
 it("doesn't warn if you use nested acts from different renderers", () => {
   TestRenderer.act(() => {
-    ReactDOM.act(() => {
+    TestUtils.act(() => {
       TestRenderer.create(<App />);
     });
   });
diff --git a/scripts/rollup/bundles.js b/scripts/rollup/bundles.js
index 42bcf3653ea86..bed93da23b30c 100644
--- a/scripts/rollup/bundles.js
+++ b/scripts/rollup/bundles.js
@@ -104,22 +104,6 @@ const bundles = [
     externals: ['react', 'react-dom'],
   },
 
-  /******* React DOM - Testing *******/
-  {
-    moduleType: RENDERER,
-    bundleTypes: [
-      UMD_DEV,
-      UMD_PROD,
-      UMD_PROFILING,
-      NODE_DEV,
-      NODE_PROD,
-      NODE_PROFILING,
-    ],
-    entry: 'react-dom/testing',
-    global: 'ReactDOM',
-    externals: ['react'],
-  },
-
   /******* React DOM - www - Testing *******/
   {
     moduleType: RENDERER,
diff --git a/scripts/rollup/forks.js b/scripts/rollup/forks.js
index 27b3c97a51511..aa0938b7d539d 100644
--- a/scripts/rollup/forks.js
+++ b/scripts/rollup/forks.js
@@ -46,7 +46,7 @@ const forks = Object.freeze({
   // Without this fork, importing `shared/ReactSharedInternals` inside
   // the `react` package itself would not work due to a cyclical dependency.
   'shared/ReactSharedInternals': (bundleType, entry, dependencies) => {
-    if (entry === 'react' || entry === 'react/testing') {
+    if (entry === 'react') {
       return 'react/src/ReactSharedInternals';
     }
     if (dependencies.indexOf('react') === -1) {
@@ -107,7 +107,6 @@ const forks = Object.freeze({
         }
         return 'shared/forks/ReactFeatureFlags.test-renderer.js';
       case 'react-dom/testing':
-      case 'react/testing':
         switch (bundleType) {
           case FB_WWW_DEV:
           case FB_WWW_PROD: