Created VisitsHeader test

test/visits/VisitsHeader.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import Moment from 'react-moment';
+import { VisitsHeader } from '../../src/visits/VisitsHeader';
+import ExternalLink from '../../src/utils/ExternalLink';
+
+describe('<VisitsHeader />', () => {
+  let wrapper;
+  const shortUrlDetail = {
+    shortUrl: {
+      longUrl: 'https://foo.bar/bar/foo',
+      dateCreated: '2018-01-01T10:00:00+01:00',
+    },
+    loading: false,
+  };
+  const shortUrlVisits = {
+    visits: [{}, {}, {}],
+  };
+
+  beforeEach(() => {
+    wrapper = shallow(
+      <VisitsHeader shortUrlDetail={shortUrlDetail} shortUrlVisits={shortUrlVisits} shortLink="foo" />
+    );
+  });
+  afterEach(() => wrapper.unmount());
+
+  it('shows the amount of visits', () => {
+    const visitsBadge = wrapper.find('.badge');
+
+    expect(visitsBadge.text()).toEqual(`Visits: ${shortUrlVisits.visits.length}`);
+  });
+
+  it('shows when the URL was created', () => {
+    const moment = wrapper.find(Moment).first();
+
+    expect(moment.prop('children')).toEqual(shortUrlDetail.shortUrl.dateCreated);
+  });
+
+  it('shows the long URL', () => {
+    const longUrlLink = wrapper.find(ExternalLink).last();
+
+    expect(longUrlLink.prop('href')).toEqual(shortUrlDetail.shortUrl.longUrl);
+  });
+});