feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

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+# `siginfo`
+
+[![Build Status](https://travis-ci.org/emilbayes/siginfo.svg?branch=master)](https://travis-ci.org/eemilbayes/siginfo)
+
+> Utility module to print pretty messages on SIGINFO/SIGUSR1
+
+`SIGINFO` on BSD / macOS and `SIGUSR1` on Linux, usually triggered by
+`Ctrl + T`, are by convention used to print information about
+a long running process internal state. Eg. `dd` will tell you how many blocks it
+has written and at what speed, while `xz` will tell you progress, compression
+ratio and estimated time remaining.
+
+This module wraps both signals, checks if the process is connected to TTY and
+lets you do whatever you want.
+
+## Usage
+
+```js
+var siginfo = require('siginfo')
+var pkg = require('./package.json')
+
+siginfo(function () {
+  console.dir({
+    version: pkg.version,
+    uptime: process.uptime()
+  })
+})
+
+```
+
+## API
+
+### `var removeListener = siginfo(queryFn, [force])`
+
+`queryFn` can be used for whatever you want (logging, sending a UDP message, etc.).
+Setting `force = true` will attach the event handlers whether a TTY is present
+or not.
+
+## Install
+
+```sh
+npm install siginfo
+```
+
+## License
+
+[ISC](LICENSE)