Wrapper for testing nested smart redux components with jest

test.js

let preprops = {
  foo: 'bar'
};

spyOn(Redux, 'connect').andReturn(function (UnconnectedComponent) {
  return class Prepropulator extends React.Component {
    render() {
      let props = Object.assign({}, this.props, preprops);

      return (
        <UnconnectedComponent {...props} />
      );
    }
  };
});