'Alphabet buckets can be named by listing the \'from-to\' syntax'

def test_alpha_first_last_chars(self):

    self._setup_config(bucket_alpha=['0->9', 'A->D', 'F-H', 'I->Z'])
    self.assertEqual(self.plugin._tmpl_bucket('garry'), 'F-H')
    self.assertEqual(self.plugin._tmpl_bucket('2pac'), '0->9')
