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const isInitialMount = useRef(true);

useEffect(() => {
  if (isInitialMount.current) {
     isInitialMount.current = false;
  } else {
      // Your useEffect code here to be run on update
  }
});

import App from "./app.jsx";
import axios from "axios";

jest.mock("axios");

beforeEach(() => {
		axios.create = jest.fn(() => axios);

		axios.get.mockImplementation((url) => {
        return Promise.resolve({
            data: [{ id: 1, name: "books" }],
        });
    });
	});

test("should display app", async () => {

    render(<App />);

    expect(await screen.findByText("books")).toBeInTheDocument();
});