Created App test

src/utils/Storage.js

@@ -15,6 +15,14 @@ export class Storage {
   set = (key, value) => this.localStorage.setItem(buildPath(key), JSON.stringify(value));
 }
 
-const storage = typeof localStorage !== 'undefined' ? localStorage : {};
+const browserStorage = global.localStorage || {
+  getItem() {
+    return '';
+  },
+  setItem() {
+    return '';
+  },
+};
+const storage = new Storage(browserStorage);
 
-export default new Storage(storage);
+export default storage;

test/App.test.js

@@ -0,0 +1,26 @@
+import React from 'react';
+import { shallow } from 'enzyme';
+import { Route } from 'react-router-dom';
+import App from '../src/App';
+import MainHeader from '../src/common/MainHeader';
+
+describe('<App />', () => {
+  let wrapper;
+
+  beforeEach(() => {
+    wrapper = shallow(<App />);
+  });
+  afterEach(() => wrapper.unmount());
+
+  it('renders a header', () => expect(wrapper.find(MainHeader)).toHaveLength(1));
+
+  it('renders app main routes', () => {
+    const routes = wrapper.find(Route);
+    const expectedRoutesCount = 3;
+
+    expect(routes).toHaveLength(expectedRoutesCount);
+    expect(routes.at(0).prop('path')).toEqual('/server/create');
+    expect(routes.at(1).prop('path')).toEqual('/');
+    expect(routes.at(2).prop('path')).toEqual('/server/:serverId');
+  });
+});