Created ScrollToTop test

test/common/ScrollToTop.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import * as sinon from 'sinon';
+import createScrollToTop from '../../src/common/ScrollToTop';
+
+describe('<ScrollToTop />', () => {
+  let wrapper;
+  const window = {
+    scrollTo: sinon.spy(),
+  };
+
+  beforeEach(() => {
+    const ScrollToTop = createScrollToTop(window);
+
+    wrapper = shallow(<ScrollToTop locaction={{ href: 'foo' }}>Foobar</ScrollToTop>);
+  });
+
+  afterEach(() => {
+    wrapper.unmount();
+    window.scrollTo.resetHistory();
+  });
+
+  it('just renders children', () => expect(wrapper.text()).toEqual('Foobar'));
+
+  it('scrolls to top when location changes', () => {
+    wrapper.instance().componentDidUpdate({ location: { href: 'bar' } });
+    expect(window.scrollTo.calledOnce).toEqual(true);
+  });
+});