How to use the pelican.Pelican function in pelican

def assert_rst_equal(self, rstfile, expected, **kwargs):
        pelican = Pelican(settings=get_settings(**kwargs))
        reader = Readers(pelican.settings)
        content = reader.read_file(base_path=RESOURCES_PATH, path=rstfile).content
        self.assertEqual(normalize(content), normalize(expected))

test_data/content``
        Remember to remove the output/ folder before that.
        '''
        base_path = os.path.dirname(os.path.abspath(__file__))
        base_path = os.path.join(base_path, 'test_data')
        content_path = os.path.join(base_path, 'content')
        output_path = os.path.join(base_path, 'output')
        settings_path = os.path.join(base_path, 'pelicanconf.py')
        settings = read_settings(path=settings_path, override={
            'PATH': content_path,
            'OUTPUT_PATH': self.temp_path,
            'CACHE_PATH': self.temp_cache,
            'PLUGINS': [i18ns],
            }
        )
        pelican = Pelican(settings)
        pelican.run()

        # compare output
        out, err = subprocess.Popen(
            ['git', 'diff', '--no-ext-diff', '--exit-code', '-w', output_path,
             self.temp_path], env={'PAGER': ''},
            stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        self.assertFalse(out, 'non-empty `diff` stdout:\n{}'.format(out))
        self.assertFalse(err, 'non-empty `diff` stderr:\n{}'.format(out))

# encoding=utf-8

import os.path
import json

from bunch import Bunch

from flask import current_app

from pelican import Pelican
from pelican.settings import _DEFAULT_CONFIG


class Calepin(Pelican):

    USER_CONFIG_PROPERTIES = (
        'AUTHOR',
        'DEFAULT_DATE_FORMAT',
        'GOOGLE_ANALYTICS',
        'GAUGE_ID',
        'CLICKY',
        'DEFAULT_PAGINATION',
        'WITH_FUTURE_DATES',
        'OUTPUT_SOURCES',
        'TIMEZONE',
    )

    def __init__(self, blog):
        self.blog = blog
        self._config = Bunch(current_app.config)