Test fails on Node 18

[pieterocp]

~/careplanner/nodejs-websocket (master) $ npm test

nodejs-websocket@1.7.2 test
mocha -R spec -b

extraHeaders
✓ should create a headerString with extra header options

frames
✓ should connect to a websocket server
1) should deliver texts in order

2 passing (50ms)
1 failing

1. frames
   should deliver texts in order:
   TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: 1
   at new NodeError (node:internal/errors:405:5)
   at _write (node:internal/streams/writable:296:13)
   at Writable.write (node:internal/streams/writable:337:10)
   at Connection.sendText (Connection.js:142:23)
   at Array.forEach ()
   at Context. (test/test.js:75:8)
   at process.processImmediate (node:internal/timers:476:21)