Created TagVisitsHeader test

test/visits/TagVisitsHeader.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import Tag from '../../src/tags/helpers/Tag';
+import TagVisitsHeader from '../../src/visits/TagVisitsHeader';
+
+describe('<TagVisitsHeader />', () => {
+  let wrapper;
+  const tagVisits = {
+    tag: 'foo',
+    visits: [{}, {}, {}],
+  };
+  const goBack = jest.fn();
+
+  beforeEach(() => {
+    wrapper = shallow(
+      <TagVisitsHeader tagVisits={tagVisits} goBack={goBack} colorGenerator={{}} />
+    );
+  });
+  afterEach(() => wrapper.unmount());
+
+  it('shows expected visits', () => {
+    expect(wrapper.prop('visits')).toEqual(tagVisits.visits);
+  });
+
+  it('shows title for tag', () => {
+    const title = shallow(wrapper.prop('title'));
+    const tag = title.find(Tag).first();
+
+    expect(tag.prop('text')).toEqual(tagVisits.tag);
+
+    title.unmount();
+  });
+});