def test_format_fs_label(self, _):
short_label = 'label'
long_label = '0123456789ABCD'
long_label_trimmed = long_label[:12]
template = ' -L {0} '
self.assertEqual(fu.format_fs_label(None), '')
self.assertEqual(fu.format_fs_label(short_label),
template.format(short_label))
self.assertEqual(fu.format_fs_label(long_label),
template.format(long_label_trimmed))
