Test the behavior defined in useEffect

EffectComponent.test.js

import * as reactModule from "react";
import { shallow } from "enzyme";
import EffectComponent from "./EffectComponent";

describe("test App Component", () => {
  it("should call the logic in useEffect", () => {
    const setDataSize = jest.fn(size => {});
    reactModule.useState = jest.fn(initialDataSize => [
      initialDataSize,
      setDataSize
    ]);

    reactModule.useEffect = jest.fn((effectLogic, triggers) => effectLogic());
    wrapper = shallow(<EffectComponent />);
    expect(setDataSize).toHaveBeenCalledWith(3);
  });
});