utils.js

import http from 'http'

export const checkFields = (t, object, fields) => {
    fields.forEach(field => {
        t.truthy(field in object)
    })
}

const generatePort = (() => {
    let portNum = 9000
    return () => portNum++
})()

export const createHttpServer = requestHandler => {
    const server = http.createServer(requestHandler)
    const port = generatePort()
    return {
        url: `http://127.0.0.1:${port}`,
        start: () =>
            new Promise((resolve, reject) =>
                server.listen(port, err => (err ? reject(err) : resolve())),
            ),
        stop: () =>
            new Promise((resolve, reject) => server.close(err => (err ? reject(err) : resolve()))),
    }
}