Getting @now/node helpers with tests

helper.js

const micro = require('micro');

// taken directly from
// https://github.com/zeit/now-builders/blob/f67480a98ac461dc2fe6bb27e8a4ea86e9b6b60a/packages/now-node/src/helpers.ts#L47-L60
function queryParser({ url = '/' }) {

  const { URL } = require('url');
  // we provide a placeholder base url because we only want searchParams
  const params = new URL(url, 'https://n').searchParams;

  const query = {};
  for (const [key, value] of params) {
    query[key] = value;
  }

  return query;

}

const wrappedMicro = (route) => micro(async (req, res) => {
  req.query = queryParser(req);
  return await route(req, res);
});

module.exports = wrappedMicro;

route.js

const { send } = require('micro');

module.exports = async (req, res) => {
  try {
    const query = req.query;
    send(res, 200, query);
  } catch (err) {
    send(res, 500);
  }
};

test.js

// This example is using Jest
const listen = require('test-listen');
const fetch = require('isomorphic-unfetch');
const route = require('./route');
const server = require('./helper');

describe('A cool test', () => {

  it('Will have @now/node request.query helper', async () => {
    const service = server(route);
    const url = await listen(service);
    const res = await fetch(`${url}?test=working`);
    const body = await (res => res.json())(res);
    expect(res.status).toBe(200);
    expect(body).toEqual({ 'test': "working" });
    service.close();
  });

});