Preserve route after login

src/App.jsx

@@ -19,7 +19,7 @@ import FullPageLoading from './components/FullPageLoading';
 const Explorer = lazy(() => import('./components/explorer'));
 const AnonymousLanding = lazy(() => import('./components/anonymous'));
 
-class App extends Component {
+export class App extends Component {
   constructor(props) {
     super(props);
 
@@ -87,12 +87,17 @@ class App extends Component {
   }
 
   redirectLink() {
+    if (this.redirectURL !== undefined) {
+      return this.redirectURL;
+    }
+
     let url = '/';
     if (typeof window.sessionStorage !== 'undefined' && sessionStorage.getItem('redirectURL') !== null) {
       url = sessionStorage.getItem('redirectURL');
       sessionStorage.removeItem('redirectURL');
     }
-    return url;
+    this.redirectURL = url;
+    return this.redirectURL;
   }
 
   authRoutes() {

src/__tests__/App.test.jsx

@@ -1,11 +1,21 @@
 /* eslint-env jest */
 import { act, render } from '@testing-library/react';
-import App from '../App';
+import App, { App as AppComponent } from '../App';
 
 describe('App', () => {
   it('should not crash', () => {
     act(() => {
       render(<App />);
     });
   });
+
+  it('preserves the login redirect across renders', () => {
+    const route = '/0123456789abcdef/00000000--0123456789/0/60';
+    window.sessionStorage.setItem('redirectURL', route);
+    const app = new AppComponent({});
+
+    expect(app.redirectLink()).toBe(route);
+    expect(window.sessionStorage.getItem('redirectURL')).toBeNull();
+    expect(app.redirectLink()).toBe(route);
+  });
 });