Composer script - run only sometimes - php

Question

In my composer.json I have a script called tests that is just an array of several commands for testing tools.
One of those commands is pretty slow and somewhat unimportant. So I would like to run it only occasionally and not always (whole composer tests is run as pre-commit hook)
I had an idea of doing something like
"scripts": {
"slowScript": "rand(0,10) != 5 || actualSlowScript"
}
but I can't get it to work. The script needs to be platform independent as we use different OS.
Do you have an idea on how to get it working?

Answer 1

This is a solution:
Create a PHP class with static method as in https://getcomposer.org/doc/articles/scripts.md#defining-scripts
<?php
namespace ComposerScripts;
use Composer\Console\Application;
use Composer\Script\Event;
use Symfony\Component\Console\Input\ArrayInput;
final class RandomLint
{
public static function runLintAtRandom(Event $event): void
{
$random = random_int(1, 5);
if ($random === 1) {
$event->getIO()->write('Lint skipped');
return;
}
$input = new ArrayInput(array('command' => 'lint'));
$application = new Application();
$application->setAutoExit(false);
$application->run($input);
}
}
then define the script as
"scripts": {
"test": [
"ComposerScripts\\RandomLint::runLintAtRandom",
"secondScript",
"#thirdOne"
]
}
and you can control scripts from PHP Class. I can see quite some potential in this solution.

Answer 2

I would not build it into the test script because then you can never force the test to run when you want, like in a build pipeline. You can do it via the composer scripts feature by using the exit status of a shell command:
"scripts": {
"slowScript": "[ $(rand -M 5) -eq 0 ] && actualSlowScript"
}
Assuming you have the rand command installed, this picks a random number between 0 and 4, then only runs the test if it picked 0.
Note this will throw a composer warning 80% of the time. If that's problematic, you could do something like this:
"scripts": {
"slowScript": "if [ $(rand -M 5) -eq 0 ]; then actualSlowScript; else echo skipping slow test; fi"
}