After updating my dependencies this morning with composer ("symfony/symfony": "2.1.*"), I figured out that every commands using the option "--env=test" would throw the following exception:

[ErrorException]                                                                                                                                                               
  Notice: unserialize(): Error at offset 65 of 67 bytes in [...]/vendor/symfony/symfony/src/Symfony/Component/Config/Resource/FileResource.php line 115

After putting a nice var_dump($serialized); in FileResource::unserialized(), and running different commands we can see that the content of $serialize causing this exception is the following one:

s:59:"[...]/app/cache/test/kernel.tmp";}i:1

This "}i:1" looks particulary suspicious to me.
Anyone having the same trouble?