Can't stream (live) child_process stdout and stderr

[stavalfi]

Running this code from ava cli will not print anything from child-process:

const test = require('ava')
const { spawn } = require('child_process')

test('foo', t => {
  spawn('node', ['./example.js'], {
    stdio: 'inherit',
  })
  t.pass()
})

example.js

console.log("good1")
console.error("good2")

---

running the same logic without ava, will print as execpted

const { spawn } = require('child_process')

spawn('node', ['./example.js'], {
  stdio: 'inherit',
})

output:

good1
good2

---

command: ava --verbose

Node.js v10.15.0
darwin 18.7.0
2.4.0
6.5.0

---

I couldn't find any working solution in the issues

[novemberborn]

With the example you give, the worker process may exit without giving the spawned process a chance to start. But I would expect this to work, yes.

(I'm closing this issue for housekeeping purposes, but let's keep the conversation going.)

[danielgormly]

I also ran into an issue with using spawn (both sync and async versions). In a request with the software consul-template whose IO times out when an external connection can't be made. Running in Node directly or with a different test runner, everything happens as expected. Ava on the other hand, fails silently.

Node v16.1.0
Ava 3.15

[novemberborn]

@danielgormly do you want to start a new discussion with more details about test setup and expected outcome?