How to use the flaky._flaky_plugin._FlakyPlugin function in flaky

def __init__(self, plugin):
        super(FlakyXdist, self).__init__()
        self._plugin = plugin

    def pytest_testnodedown(self, node, error):
        """
        Pytest hook for responding to a test node shutting down.
        Copy worker flaky report output so it's available on the master flaky report.
        """
        # pylint: disable=unused-argument, no-self-use
        worker_output = _get_worker_output(node)
        if worker_output is not None and 'flaky_report' in worker_output:
            self._plugin.stream.write(worker_output['flaky_report'])


class FlakyPlugin(_FlakyPlugin):
    """
    Plugin for pytest that allows retrying flaky tests.

    """
    runner = None
    flaky_report = True
    force_flaky = False
    max_runs = None
    min_passes = None
    config = None
    _call_infos = {}
    _PYTEST_WHEN_SETUP = 'setup'
    _PYTEST_WHEN_CALL = 'call'
    _PYTEST_WHENS = (_PYTEST_WHEN_SETUP, _PYTEST_WHEN_CALL)
    _PYTEST_OUTCOME_PASSED = 'passed'
    _PYTEST_OUTCOME_FAILED = 'failed'

def __init__(self):
        super(_FlakyPlugin, self).__init__()
        self._stream = StringIO()
        self._flaky_success_report = True
        self._had_flaky_tests = False

# coding: utf-8

from __future__ import unicode_literals

import logging
from optparse import OptionGroup
import os

from nose.failure import Failure
from nose.plugins import Plugin
from nose.result import TextTestResult

from flaky._flaky_plugin import _FlakyPlugin


class FlakyPlugin(_FlakyPlugin, Plugin):
    """
    Plugin for nosetests that allows retrying flaky tests.
    """
    name = 'flaky'

    def __init__(self):
        super(FlakyPlugin, self).__init__()
        self._logger = logging.getLogger('nose.plugins.flaky')
        self._flaky_result = None
        self._nose_result = None
        self._flaky_report = True
        self._force_flaky = False
        self._max_runs = None
        self._min_passes = None
        self._test_status = {}
        self._tests_that_reran = set()