human
I wrote the below code

    if (extra_arguments is None):
        extra_arguments = []
    def parseOptions(options, argv):
        options.parseOptions((argv + extra_arguments))
    class VolumeOptionsTests(TestCase, ):
        '\n                                Tests    for    ``Options``    subclasses    decorated    with\n                                ``flocker_volume_options``.\n                                '
        def test_default_config(self):
            "\n                                                By    default    the    config    file    is    ``b'/etc/flocker/volume.json'``.\n                                                "
            options = make_options()
            parseOptions(options, [])
            self.assertEqual(FilePath('/etc/flocker/volume.json'), options['config'])
        def test_config(self):
            '\n                                                The    options    class    accepts    a    ``--config``    parameter.\n                                                '
            path = '/foo/bar'
            options = make_options()
            parseOptions(options, ['--config', path])
            self.assertEqual(FilePath(path), options['config'])
        def test_pool(self):
            '\n                                                The    options    class    accepts    a    ``--pool``    parameter.\n                                                '
            pool = 'foo-bar'
            options = make_options()
            parseOptions(options, ['--pool', pool])
            self.assertEqual(pool, options['pool'])
        def test_mountpoint(self):
            '\n                                                The    options    class    accepts    a    ``--mountpoint``    parameter.\n                                                '
            mountpoint = '/bar/baz'
            options = make_options()
            parseOptions(options, ['--mountpoint', mountpoint])
            self.assertEqual(mountpoint, options['mountpoint'])
    dummy_options = make_options()
   ...

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def make_volume_options_tests(make_options, extra_arguments=None):