Add test coverage for Twig_Cache_Filesystem
Add test coverage for Twig_Cache_Filesystem

derickr/Twig,nicolas-grekas/Twig,hhamon/Twig,craue/Twig,nicolas-grekas/Twig,apishka/templater,twigphp/Twig,derickr/Twig,gencer/Twig,dkarvounaris/Twig,hhamon/Twig,gencer/Twig,nicolas-grekas/Twig,twigphp/Twig,nicolas-grekas/Twig,derickr/Twig,dkarvounaris/Twig,hhamon/Twig,craue/Twig,gamernetwork/Twig,gamernetwork/Twig,twigphp/Twig,nicolas-grekas/Twig,apishka/templater,dkarvounaris/Twig,gamernetwork/Twig