jest-dev-server can't detect used ports since 4.1.1

💥 Regression Report

Since the latest release (4.1.1), jest-puppeteer will timeout when trying to detect if a port is used. I was able to narrow it down to the changes in jest-dev-server introduced in #227.

Last working version

Worked up to version: jest-dev-server@4.0.0

Stopped working in version: jest-dev-server@4.1.1

To Reproduce

Steps to reproduce the behavior:

1. Start an express server on port 3000
2. Set the server.port to 3000 in the jest-puppeteer.config.js file
3. jest

Expected behavior

jest-puppeteer should be able to detect if the port is used, and the tests should pass.

Link to repl or repo (highly encouraged)

https://github.com/Dilatorily/jest-puppeteer-issue

Run npx envinfo --system --binaries --npmPackages expect-puppeteer,jest-dev-server,jest-environment-puppeteer,jest-puppeteer,spawnd --markdown --clipboard

Paste the results here:

## System:
 - OS: macOS Sierra 10.12.6
 - CPU: (4) x64 Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
 - Memory: 2.71 GB / 16.00 GB
 - Shell: 3.2.57 - /bin/bash
## Binaries:
 - Node: 11.14.0 - /usr/local/bin/node
 - Yarn: 1.15.2 - /usr/local/bin/yarn
 - npm: 6.9.0 - /usr/local/bin/npm
 - Watchman: 4.9.0 - /usr/local/bin/watchman
## npmPackages:
 - jest-puppeteer: ^4.1.1 => 4.1.1

[sync]

Don’t work too hard. Take the time and don’t stress about it ❤️

[xiaoyuhen]

it seems like we must set tcp prefixes, then wait-on package can find our server.

very sorry about the problem, it will fix on this https://github.com/smooth-code/jest-puppeteer/pull/235 PR. cc @sync @Dilatorily