学习单元测试

src/views/Demo/Root.js

+import React, { Component } from 'react';
+
+const styles = {
+  height: '100%',
+  background: '#333'
+}
+
+class Root extends Component {
+  render() {
+    return (
+      <div style={styles}>
+        <h1 className='welcome-header'>Welcome to testing React!</h1>
+      </div>
+    )
+  }
+}
+
+export default Root;
\ No newline at end of file

src/views/Demo/index.js

+import React, { Component } from 'react';
+import { render } from 'react-dom';
+
+class Root extends Component {
+  render() {
+    return <h1> Hello World </h1>;
+  }
+}
+
+export default Root;
\ No newline at end of file