next.js/test/integration/basic/pages/url-prop-override.js

import React from 'react'
export default class extends React.Component {
  static getInitialProps () {
    return {
      url: 'test' // This gets overridden by Next in lib/_app.js
    }
  }
  render () {
    const {url} = this.props
    return <div>
      <p id='pathname'>{url.pathname}</p>
      <p id='query'>{Object.keys(url.query).length}</p>
      <p id='aspath'>{url.asPath}</p>
    </div>
  }
}