Migrated some common components and their dependencies to TS

test/common/ScrollToTop.test.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+import { shallow, ShallowWrapper } from 'enzyme';
+import { Mock } from 'ts-mockery';
+import { RouteChildrenProps } from 'react-router';
+import createScrollToTop from '../../src/common/ScrollToTop';
+
+describe('<ScrollToTop />', () => {
+  let wrapper: ShallowWrapper;
+
+  beforeEach(() => {
+    const ScrollToTop = createScrollToTop();
+
+    wrapper = shallow(<ScrollToTop {...Mock.all<RouteChildrenProps>()}>Foobar</ScrollToTop>);
+  });
+
+  afterEach(() => wrapper.unmount());
+
+  it('just renders children', () => expect(wrapper.text()).toEqual('Foobar'));
+});