diff --git a/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js b/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
index bacf9da7029a7..80dcaff819eef 100644
--- a/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
@@ -1777,7 +1777,7 @@ describe('ReactHooksWithNoopRenderer', () => {
         }, [props.count]);
         return <Text text={'Count: ' + count} />;
       }
-      expect(() =>
+      expect(() => {
         act(() => {
           ReactNoop.render(<Counter count={0} />, () =>
             Scheduler.unstable_yieldValue('Sync effect'),
@@ -1787,8 +1787,8 @@ describe('ReactHooksWithNoopRenderer', () => {
             'Sync effect',
           ]);
           expect(ReactNoop.getChildren()).toEqual([span('Count: (empty)')]);
-        }),
-      ).toErrorDev('flushSync was called from inside a lifecycle method');
+        });
+      }).toErrorDev('flushSync was called from inside a lifecycle method');
       expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
     });
 
@@ -2648,32 +2648,32 @@ describe('ReactHooksWithNoopRenderer', () => {
       }
 
       const root1 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root1.render(<App return={17} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned: 17',
       ]);
 
       const root2 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root2.render(<App return={null} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned null. If your ' +
           'effect does not require clean up, return undefined (or nothing).',
       ]);
 
       const root3 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root3.render(<App return={Promise.resolve()} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useEffect must not return anything besides a ' +
           'function, which is used for clean-up.\n\n' +
           'It looks like you wrote useEffect(async () => ...) or returned a Promise.',
@@ -3052,32 +3052,32 @@ describe('ReactHooksWithNoopRenderer', () => {
       }
 
       const root1 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root1.render(<App return={17} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useInsertionEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned: 17',
       ]);
 
       const root2 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root2.render(<App return={null} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useInsertionEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned null. If your ' +
           'effect does not require clean up, return undefined (or nothing).',
       ]);
 
       const root3 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root3.render(<App return={Promise.resolve()} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useInsertionEffect must not return anything besides a ' +
           'function, which is used for clean-up.\n\n' +
           'It looks like you wrote useInsertionEffect(async () => ...) or returned a Promise.',
@@ -3104,11 +3104,11 @@ describe('ReactHooksWithNoopRenderer', () => {
       }
 
       const root = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root.render(<App />);
-        }),
-      ).toErrorDev(['Warning: useInsertionEffect must not schedule updates.']);
+        });
+      }).toErrorDev(['Warning: useInsertionEffect must not schedule updates.']);
 
       expect(() => {
         act(() => {
@@ -3359,32 +3359,32 @@ describe('ReactHooksWithNoopRenderer', () => {
       }
 
       const root1 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root1.render(<App return={17} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useLayoutEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned: 17',
       ]);
 
       const root2 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root2.render(<App return={null} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useLayoutEffect must not return anything besides a ' +
           'function, which is used for clean-up. You returned null. If your ' +
           'effect does not require clean up, return undefined (or nothing).',
       ]);
 
       const root3 = ReactNoop.createRoot();
-      expect(() =>
+      expect(() => {
         act(() => {
           root3.render(<App return={Promise.resolve()} />);
-        }),
-      ).toErrorDev([
+        });
+      }).toErrorDev([
         'Warning: useLayoutEffect must not return anything besides a ' +
           'function, which is used for clean-up.\n\n' +
           'It looks like you wrote useLayoutEffect(async () => ...) or returned a Promise.',
diff --git a/packages/react/src/__tests__/ReactCoffeeScriptClass-test.coffee b/packages/react/src/__tests__/ReactCoffeeScriptClass-test.coffee
index 772905b7e0142..c9caacb9c405b 100644
--- a/packages/react/src/__tests__/ReactCoffeeScriptClass-test.coffee
+++ b/packages/react/src/__tests__/ReactCoffeeScriptClass-test.coffee
@@ -131,6 +131,7 @@ describe 'ReactCoffeeScriptClass', ->
     expect(->
       act ->
         root.render React.createElement(Foo, foo: 'foo')
+      return
     ).toErrorDev 'Foo: getDerivedStateFromProps() is defined as an instance method and will be ignored. Instead, declare it as a static method.'
 
   it 'warns if getDerivedStateFromError is not static', ->
@@ -142,6 +143,7 @@ describe 'ReactCoffeeScriptClass', ->
     expect(->
       act ->
         root.render React.createElement(Foo, foo: 'foo')
+      return
     ).toErrorDev 'Foo: getDerivedStateFromError() is defined as an instance method and will be ignored. Instead, declare it as a static method.'
 
   it 'warns if getSnapshotBeforeUpdate is static', ->
@@ -153,6 +155,7 @@ describe 'ReactCoffeeScriptClass', ->
     expect(->
       act ->
         root.render React.createElement(Foo, foo: 'foo')
+      return
     ).toErrorDev 'Foo: getSnapshotBeforeUpdate() is defined as a static method and will be ignored. Instead, declare it as an instance method.'
 
   it 'warns if state not initialized before static getDerivedStateFromProps', ->
@@ -169,6 +172,7 @@ describe 'ReactCoffeeScriptClass', ->
     expect(->
       act ->
         root.render React.createElement(Foo, foo: 'foo')
+      return
     ).toErrorDev (
       '`Foo` uses `getDerivedStateFromProps` but its initial state is ' +
       'undefined. This is not recommended. Instead, define the initial state by ' +
diff --git a/packages/react/src/__tests__/ReactES6Class-test.js b/packages/react/src/__tests__/ReactES6Class-test.js
index 67b9e11a49805..5cee6f961948b 100644
--- a/packages/react/src/__tests__/ReactES6Class-test.js
+++ b/packages/react/src/__tests__/ReactES6Class-test.js
@@ -147,7 +147,9 @@ describe('ReactES6Class', () => {
         return <div />;
       }
     }
-    expect(() => act(() => root.render(<Foo foo="foo" />))).toErrorDev(
+    expect(() => {
+      act(() => root.render(<Foo foo="foo" />));
+    }).toErrorDev(
       'Foo: getDerivedStateFromProps() is defined as an instance method ' +
         'and will be ignored. Instead, declare it as a static method.',
     );
@@ -162,7 +164,9 @@ describe('ReactES6Class', () => {
         return <div />;
       }
     }
-    expect(() => act(() => root.render(<Foo foo="foo" />))).toErrorDev(
+    expect(() => {
+      act(() => root.render(<Foo foo="foo" />));
+    }).toErrorDev(
       'Foo: getDerivedStateFromError() is defined as an instance method ' +
         'and will be ignored. Instead, declare it as a static method.',
     );
@@ -175,7 +179,9 @@ describe('ReactES6Class', () => {
         return <div />;
       }
     }
-    expect(() => act(() => root.render(<Foo foo="foo" />))).toErrorDev(
+    expect(() => {
+      act(() => root.render(<Foo foo="foo" />));
+    }).toErrorDev(
       'Foo: getSnapshotBeforeUpdate() is defined as a static method ' +
         'and will be ignored. Instead, declare it as an instance method.',
     );
@@ -193,7 +199,9 @@ describe('ReactES6Class', () => {
         return <div className={`${this.state.foo} ${this.state.bar}`} />;
       }
     }
-    expect(() => act(() => root.render(<Foo foo="foo" />))).toErrorDev(
+    expect(() => {
+      act(() => root.render(<Foo foo="foo" />));
+    }).toErrorDev(
       '`Foo` uses `getDerivedStateFromProps` but its initial state is ' +
         'undefined. This is not recommended. Instead, define the initial state by ' +
         'assigning an object to `this.state` in the constructor of `Foo`. ' +