rewrote to use react.sfc

public/app/features/plugins/PluginList.test.tsx

@@ -2,12 +2,13 @@ import React from 'react';
 import { shallow } from 'enzyme';
 import PluginList from './PluginList';
 import { getMockPlugins } from './__mocks__/pluginMocks';
+import { LayoutModes } from '../../core/components/LayoutSelector/LayoutSelector';
 
 const setup = (propOverrides?: object) => {
   const props = Object.assign(
     {
       plugins: getMockPlugins(5),
-      layout: 'grid',
+      layoutMode: LayoutModes.Grid,
     },
     propOverrides
   );