test_runner: chai.expect() error properties are missing in reporter

[f3oall]

Version

v22.11.0

Platform

Linux F3OAllGAMELAP 5.15.167.4-microsoft-standard-WSL2 #1 SMP Tue Nov 5 00:21:55 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

test_runner

What steps will reproduce the bug?

import {describe, it} from 'node:test'
import {expect} from 'chai'

describe('Group', () => {
    it('should show diff if fails', () => {
        try {
            expect({number: {type: Number}}).to.deep.equal({number: {type: Number, required: true}}) 
        } catch (e) {
            console.log('Actual Error', e) // AssertionError from chai has `actual`, `expected` and `showDiff` properties
            throw e // but in test reporter, these properties are missing
        }
    })
    it('shows diff if fails', () => {
        expect({number: {type: 1}}).to.deep.equal({number: {type: 2, required: true}}) // works fine, when no function type is present
    })
})

Run this code with node --test, seems like running it with just node fixes the issue.

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

100%

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

AssertionError properties like (actual, expected) are preserved.

What do you see instead?

AssertionError properties are missing, if some of them have functions inside.

Additional information

Repo for reproduction: https://github.com/f3oall/node-test-runner-issue

[cjihrig]

This has nothing to do with chai. The reason you aren't seeing those function values is because a function cannot be sent between processes (which is what happens with --test). If you run with --test --experimental-test-isolation=none, which does not spawn any child processes, you'll see the functions included.