Jest test fails due to mock function despite its execution

Question

The following Jest unit test:

const onSuccess = jest.fn(() => console.log("Boooboooo"));
render(
  <Footer onSuccess={onSuccess}
  />
);
const approveButton = screen.getByRole("button", {name: "APPROVE"});
userEvent.click(approveButton);
expect(onSuccess).toHaveBeenCalled();

fails:

expect(jest.fn()).toHaveBeenCalled()

Expected number of calls: >= 1
Received number of calls:    0

whereas onSuccess does run:

console.log
Boooboooo

The last two parts are from Jest logs. Any idea what's the issue?