Created QrCodeModal test

test/short-urls/helpers/QrCodeModal.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import QrCodeModal from '../../../src/short-urls/helpers/QrCodeModal';
+import ExternalLink from '../../../src/utils/ExternalLink';
+
+describe('<QrCodeModal />', () => {
+  let wrapper;
+  const url = 'https://doma.in/abc123';
+
+  beforeEach(() => {
+    wrapper = shallow(<QrCodeModal url={url} />);
+  });
+  afterEach(() => wrapper.unmount());
+
+  it('shows an external link to the URL', () => {
+    const externalLink = wrapper.find(ExternalLink);
+
+    expect(externalLink).toHaveLength(1);
+    expect(externalLink.prop('href')).toEqual(url);
+  });
+
+  it('displays an image with the QR code of the URL', () => {
+    const img = wrapper.find('img');
+
+    expect(img).toHaveLength(1);
+    expect(img.prop('src')).toEqual(`${url}/qr-code`);
+  });
+});