End to end test for counter component

App.test.js

it("should initialise with the value stored in localStorage", () => {
  // set the localStorage to a value other than 0
  localStorage.setItem("count", 15);

  // render the App and check it initialises to the value in localStorage
  render(<App />);
  screen.getByText(/Number: 15/);

  // click the increment button and check the localStorage is updated
  const incrementButton = screen.getByText(/\+1/);
  fireEvent.click(incrementButton);
  screen.getByText(/Number: 16/);
  expect(localStorage.getItem("count")).toBe("16");
});