Test runner run function crashing

Version

v18.15.0

Platform

Microsoft Windows NT 10.0.19045.0 x64

Subsystem

No response

What steps will reproduce the bug?

import { run } from 'node:test';

run({ files: [] }).pipe(process.stdout);

How often does it reproduce? Is there a required condition?

Always. Crashes as well when files is not empty.

What is the expected behavior? Why is that the expected behavior?

It shouldn't crash.

What do you see instead?

node:internal/test_runner/harness:45                                                                                                                
      throw err;                                                                                                                                    
      ^                

TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer or Uint8Array. Received an instance of Object
    at new NodeError (node:internal/errors:399:5)
    at _write (node:internal/streams/writable:315:13)
    at Writable.write (node:internal/streams/writable:337:10)
    at TestsStream.ondata (node:internal/streams/readable:766:22)
    at TestsStream.emit (node:events:513:28)
    at Readable.read (node:internal/streams/readable:539:10)
    at flow (node:internal/streams/readable:1023:34)
    at resume_ (node:internal/streams/readable:1004:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  code: 'ERR_INVALID_ARG_TYPE'
}

Additional information

No response