Created NotFound component

test/common/NotFound.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import { Link } from 'react-router-dom';
+import NotFound from '../../src/common/NotFound';
+
+describe('<NotFound />', () => {
+  let wrapper;
+  let content;
+
+  beforeEach(() => {
+    wrapper = shallow(<NotFound />);
+    content = wrapper.text();
+  });
+
+  afterEach(() => wrapper.unmount());
+
+  it('shows expected error title', () => expect(content).toContain('Oops! We could not find requested route.'));
+
+  it('shows expected error message', () =>
+    expect(content).toContain(
+      'Use your browser\'s back button to navigate to the page you have previously come from, or just press this button.'
+    ));
+
+  it('shows a link to the home', () => {
+    const link = wrapper.find(Link);
+
+    expect(link.prop('to')).toEqual('/');
+    expect(link.prop('className')).toEqual('btn btn-outline-primary btn-lg');
+  });
+});