Testing Recipes - Timers: call useFakeTimers/userRealTimers before/af…

…ter each test (reactjs#3591)

content/docs/testing-recipes.md

@@ -465,20 +465,20 @@ import { act } from "react-dom/test-utils";
 
 import Card from "./card";
 
-jest.useFakeTimers();
-
 let container = null;
 beforeEach(() => {
   // setup a DOM element as a render target
   container = document.createElement("div");
   document.body.appendChild(container);
+  jest.useFakeTimers();
 });
 
 afterEach(() => {
   // cleanup on exiting
   unmountComponentAtNode(container);
   container.remove();
   container = null;
+  jest.useRealTimers();
 });
 
 it("should select null after timing out", () => {