private function createBlackfireConfig(Step $step, Build $build = null)
{
$config = new ProfileConfiguration();
if (null !== $build) {
$config->setBuild($build);
}
$config->setSamples($step->getSamples());
$config->setTitle($step->getTitle());
foreach ($step->getAssertions() as $assertion) {
$config->assert($assertion);
}
return $config;
}