public function testYamlContainerCompiles($directory, $actualServiceId, $expectedServiceId, ContainerBuilder $mainContainer = null)
{
// allow a container to be passed in, which might have autoconfigure settings
public function testYamlContainerCompiles($directory, $actualServiceId, $expectedServiceId, ContainerBuilder $mainContainer = null)
{
// allow a container to be passed in, which might have autoconfigure settings