def test_format(self, size):
        s = '-' * size
        sf = '%s' % (s,)
        self.failUnless(s == sf)
        del sf
        sf = '..%s..' % (s,)
        self.assertEquals(len(sf), len(s) + 4)
        self.failUnless(sf.startswith('..-'))
        self.failUnless(sf.endswith('-..'))
        del s, sf