Test that we don't call ref

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

@@ -239,21 +239,17 @@ describe('ReactFunctionComponent', () => {
     });
   });
 
-  it('should warn when given a function ref', async () => {
+  it('should warn when given a function ref and ignore them', async () => {
     function Indirection(props) {
       return <div>{props.children}</div>;
     }
 
+    const ref = jest.fn();
     class ParentUsingFunctionRef extends React.Component {
       render() {
         return (
           <Indirection>
-            <FunctionComponent
-              name="A"
-              ref={arg => {
-                expect(arg).toBe(null);
-              }}
-            />
+            <FunctionComponent name="A" ref={ref} />
           </Indirection>
         );
       }
@@ -276,6 +272,7 @@ describe('ReactFunctionComponent', () => {
         '    in Indirection (at **)\n' +
         '    in ParentUsingFunctionRef (at **)',
     );
+    expect(ref).not.toHaveBeenCalled();
 
     const container = document.createElement('div');
     const root = ReactDOMClient.createRoot(container);