Fixed test

react-scroll/react-scroll-tests.ts

@@ -1,5 +1,7 @@
 /// <reference path="./react-scroll.d.ts" />
+/// <reference path="../react/react.d.ts" />
 
+import * as React from 'react';
 import { Link, Element, Events, scroller } from 'react-scroll';
 
 class LinkTest extends React.Component<React.Props<{}>, {}> {