def METHOD_NAME(self, mock_BlockID):
    block_id = Mock()
    mock_BlockID.return_value = block_id
    block_id.get_filesystem.return_value = 'ext3'
    assert self.veritysetup.get_block_storage_filesystem() == 'ext3'
    block_id.get_filesystem.side_effect = Exception
    assert self.veritysetup.get_block_storage_filesystem() == ''