def test_join(self, size):
        s = 'A' * size
        x = s.join(['aaaaa', 'bbbbb'])
        self.assertEquals(x.count('a'), 5)
        self.assertEquals(x.count('b'), 5)
        self.failUnless(x.startswith('aaaaaA'))
        self.failUnless(x.endswith('Abbbbb'))