test2-test.jsx

// ...

describe("App", () => {
  const wrapper = mount(<App />);

  // ...

  test("Contains a Start and a Finish page", () => {
    // - when
    const startComp = wrapper.find("Start");
    const finishComp = wrapper.find("Finish");
    // - then
    expect(startComp.exists()).toBeTruthy();
    expect(finishComp.exists()).toBeTruthy();
  });
});