Updated jest for frontend

frontend/utils/setupJest.js

@@ -0,0 +1,11 @@
+/* eslint-disable */
+import React from 'react';
+import { shallow } from 'enzyme';
+import toJson from 'enzyme-to-json';
+
+const snap = children => {
+  const wrapper = shallow(children);
+  expect(toJson(wrapper)).toMatchSnapshot();
+};
+
+global.snap = snap;