Remove leftover artifacts from before React revert

Author: howard-e

client/jest.setup.js

@@ -1,5 +1,3 @@
 const fetch = require('node-fetch');
-const ResizeObserver = require('resize-observer-polyfill');
 
 global.fetch = fetch;
-global.ResizeObserver = require('resize-observer-polyfill')

client/tests/App.test.jsx

@@ -1,3 +1,7 @@
+/**
+ * @jest-environment jsdom
+ */
+
 import React from 'react';
 import Enzyme, { shallow } from 'enzyme';
 import EnzymeAdapter from 'enzyme-adapter-react-16';
@@ -15,7 +19,7 @@ const setup = () => {
     return wrapper;
 };
 
-test.skip('renders without crashing', () => {
+test('renders without crashing', () => {
     const wrapper = setup();
     expect(wrapper).toBeTruthy();
 });