[number field] Skip the owner stack spy when React cannot provide one

Author: atomiks

packages/react/src/number-field/input/NumberFieldInput.test.tsx

@@ -1422,7 +1422,11 @@ describe('<NumberField.Input />', () => {
 
   it('warns without an owner stack when React cannot provide one', async () => {
     const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
-    const ownerStackSpy = vi.spyOn(SafeReact, 'captureOwnerStack').mockReturnValue(null);
+    // React below 19.1 doesn't expose `captureOwnerStack` at all, which is the very
+    // condition under test, so there is nothing to stub on those versions.
+    const ownerStackSpy = SafeReact.captureOwnerStack
+      ? vi.spyOn(SafeReact, 'captureOwnerStack').mockReturnValue(null)
+      : null;
 
     try {
       await render(
@@ -1441,7 +1445,7 @@ describe('<NumberField.Input />', () => {
         'Base UI: <NumberField.Input> could not read clipboard text during paste handling. ',
       );
     } finally {
-      ownerStackSpy.mockRestore();
+      ownerStackSpy?.mockRestore();
       warnSpy.mockRestore();
     }
   });