Add test for multiple form submissions

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

@@ -1670,6 +1670,37 @@ describe('ReactDOMForm', () => {
     expect(divRef.current.textContent).toEqual('Current username: acdlite');
   });
 
+  it('parallel form submissions do not throw', async () => {
+    const formRef = React.createRef();
+    let resolve = null;
+    function App() {
+      async function submitForm() {
+        Scheduler.log('Action');
+        if (!resolve) {
+          await new Promise(res => {
+            resolve = res;
+          });
+        }
+      }
+      return <form ref={formRef} action={submitForm} />;
+    }
+    const root = ReactDOMClient.createRoot(container);
+    await act(() => root.render(<App />));
+
+    // Start first form submission
+    await act(async () => {
+      formRef.current.requestSubmit();
+    });
+    assertLog(['Action']);
+
+    // Submit form again while first form action is still pending
+    await act(async () => {
+      formRef.current.requestSubmit();
+      resolve(); // Resolve the promise to allow the first form action to complete
+    });
+    assertLog(['Action']);
+  });
+
   it(
     'requestFormReset works with inputs that are not descendants ' +
       'of the form element',