How to use the pygelf.gelf.object_to_json function in pygelf

def test_object_to_json(obj, expected):
    result = gelf.object_to_json(obj)
    assert result == expected

def __init__(self, debug=False, version='1.1', include_extra_fields=False, compress=False,
                 static_fields=None, json_default=gelf.object_to_json, **kwargs):
        """
        Logging handler that transforms each record into GELF (graylog extended log format) and sends it over TCP.

        :param debug: include debug fields, e.g. line number, or not
        :param include_extra_fields: include non-default fields from record to message, or not
        :param json_default: function that is called for objects that cannot be serialized to JSON natively by python
        :param kwargs: additional fields that will be included in the log message, e.g. application name.
                       Each additional field should start with underscore, e.g. _app_name
        """

        self.debug = debug
        self.version = version
        self.additional_fields = static_fields if static_fields else kwargs
        self.include_extra_fields = include_extra_fields
        self.additional_fields.pop('_id', None)
        self.domain = socket.gethostname()