Ensure DeprecationErrorHandler::collectDeprecations() is triggered #24696
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Ensure DeprecationErrorHandler::collectDeprecations() is triggered if SYMFONY_DEPRECATIONS_SERIALIZE is set
Drupal doesn't use src/Symfony/Bridge/PhpUnit/bin/simple-phpunit but would like to use the deprecation collection features of src/Symfony/Bridge/PhpUnit. The checks in src/Symfony/Bridge/PhpUnit/bootstrap.php mean that this is difficult because they rely on simple-phpunit - but I'm not sure that that is necessary.
The problem is even in isolated tests we have PHPUNIT_COMPOSER_INSTALL set because we use a custom phpunit config file.