'L{LogFile.listLogs} ignores log files which rotated suffix is 0.'

def test_listLogsIgnoresZeroSuffixedFiles(self):

    log = logfile.LogFile(self.name, self.dir)
    self.addCleanup(log.close)
    for i in range(0, 3):
        with open('{0}.{1}'.format(log.path, i), 'w') as fp:
            fp.write('123')
    self.assertEqual([1, 2], log.listLogs())
