Process isolation doesn't work starting from 10.2.0

[l-alexandrov]

Q	A
PHPUnit version	10.2.0
PHP version	8.3.0
Installation Method	Composer

Summary

When enable processs isolation in any form (CLI argument, PHP doc annotation or attribute in phpunit.xml) the tests are failing with an error.
I'm using PHPUnit in combination with Laravel 10.34.2. Prior to PHPUnit 10.2.0 I had no issues with proccess isolation.

Current behavior

When run a test in a process isolation I get Test was run in child process and ended unexpectedly error.

How to reproduce

vendor/bin/phpunit --process-isolation and see the error.

Expected behavior

Getting no errors.

Configuration

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd"
         bootstrap="vendor/autoload.php"
         executionOrder="depends,defects"
         beStrictAboutOutputDuringTests="true"
         failOnRisky="true"
         failOnWarning="true"
         colors="true"
         enforceTimeLimit="true"
         defaultTimeLimit="3"
>
    <testsuites>
        <testsuite name="Unit">
            <directory>./tests/Unit</directory>
        </testsuite>
        <testsuite name="Feature">
            <directory>./tests/Feature</directory>
        </testsuite>
        <testsuite name="Integration">
            <directory>./tests/Integration</directory>
        </testsuite>
    </testsuites>
  <coverage/>
    <php>
        <server name="APP_ENV" value="testing"/>
        <server name="BCRYPT_ROUNDS" value="4"/>
    </php>
  <source>
    <include>
      <directory suffix=".php">./app</directory>
    </include>
  </source>
</phpunit>

[sebastianbergmann]

Thank you for your report.

Please provide a minimal, self-contained, reproducing test case that shows the problem you are reporting.

Without such a minimal, self-contained, reproducing test case I will not be able to investigate this issue.

[l-alexandrov]

It looks it's a Laravel issue, since I have no problems when extending PHPUnit's TestCase class.

[arclw]

@l-alexandrov Were you able to solve it? Please share it how ?

[l-alexandrov]

@arclw In my case I'm using Laravel and it seems this is a feature that Laravel doesn't support.
They suggest using php artisan test --parallel instead, but it broke my tests.

Reference: laravel/framework#49237 (comment)

[SimplyCorey]

Does anyone know how to begin to debug this? I've tried adding the --debug flag to phpunit and it is not producing anything useful.

This is definitely related to Laravel, but they do not have any desire to resolve the issue on PHP 8.3.

The stdout is returning an empty string within processChildResult. I've looked into the pipes within DefaultPhpProcess and they are all empty as well.

[arclw]

The problem is not with PHPUnit itself. I have tried the annotation @runInSeparateProcess with PHP Unit's framework class i.e: \PHPUnit\Framework\TestCase everything is working in PHP 8.2 and 8.3, while when used Laravel's base test class i.e: Tests\TestCase; it works in PHP 8.2 but NOT in 8.3. So yes it is definitely Laravel.