@TavoNiievez This check breaks some tests in one of my own projects if I try to access $this->tester. Error message: Undefined property: xxxTest::$tester

The test works fine if I remove the if clause and just call $this->{$property} = $di->instantiate($actor);

@W0rma Sounds like you're right. Could you open a PR with something like this:

$di = $this->getMetadata()->getService('di');

if (($actor = $this->getMetadata()->getCurrent('actor')) &&
    ($property = lcfirst((string) Configuration::config()['actor_suffix']))) {

    $this->{$property} = $di->instantiate($actor);
}

?

@TavoNiievez See #6856

The change fixes the tests of my own project.