How to use the mike.commands.retitle function in mike

def test_retitle(self):
        self._deploy()
        commands.retitle('1.0', '1.0.1')
        check_call_silent(['git', 'checkout', 'gh-pages'])
        self._test_retitle()

def test_retitle_invalid(self):
        self._deploy()
        self.assertRaises(ValueError, commands.retitle, '2.0', '2.0.2')
        self.assertRaises(ValueError, commands.retitle, '1.0', '1.0.1',
                          branch='branch')

def test_commit_message(self):
        self._deploy()
        commands.retitle('1.0', '1.0.1', message='commit message')
        check_call_silent(['git', 'checkout', 'gh-pages'])
        self._test_retitle('commit message')

def test_branch(self):
        self._deploy('branch')
        commands.retitle('1.0', '1.0.1', branch='branch')
        check_call_silent(['git', 'checkout', 'branch'])
        self._test_retitle()

def retitle(args):
    check_remote_status(args, strict=True)
    commands.retitle(args.version, args.title, args.branch, args.message)
    if args.push:
        git_utils.push_branch(args.remote, args.branch, args.force)