Update tests

Author: LarryKlugerDS

src/App.js

@@ -62,7 +62,7 @@ class App extends React.Component {
             window.history.replaceState(null, '', config.DS_APP_URL);
         }
 
-        if (config.DS_REDIRECT_AUTHENTICATION) {
+        if (config?.DS_REDIRECT_AUTHENTICATION) {
             const hash = window.location.hash;
             if (!hash) {return}
             // possible OAuth response

src/App.test.js

@@ -1,8 +1,18 @@
 import { render, screen } from '@testing-library/react';
 import App from './App';
+import React from 'react';
+import ReactDOM from 'react-dom';
 
-test('renders learn react link', () => {
+test('renders login button', () => {
   render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
+  const loginEls = screen.getAllByText(/Login/i);
+  //expect(linkElement).toBeInTheDocument();
+  expect(loginEls.length).toEqual(2);
 });
+
+it('renders without crashing', () => {
+    const div = document.createElement('div');
+    ReactDOM.render(<App />, div);
+    ReactDOM.unmountComponentAtNode(div);
+  });
+