'``Volume.get_filesystem`` returns the filesystem for the volume.'

def test_get_filesystem(self):

    pool = FilesystemStoragePool(FilePath(self.mktemp()))
    service = VolumeService(FilePath(self.mktemp()), pool, None)
    volume = Volume(node_id=u'123', name=MY_VOLUME, service=service)
    self.assertEqual(volume.get_filesystem(), pool.get(volume))
