import warnings
import unittest

from scrapy.crawler import Crawler
from scrapy.settings import Settings
from scrapy.utils.spider import DefaultSpider
from scrapy.utils.misc import load_object


class CrawlerTestCase(unittest.TestCase):

    def setUp(self):
        self.crawler = Crawler(DefaultSpider, Settings())

    def test_deprecated_attribute_spiders(self):
        with warnings.catch_warnings(record=True) as w:
            spiders = self.crawler.spiders
            self.assertEqual(len(w), 1)
            self.assertIn("Crawler.spiders", str(w[0].message))
            sm_cls = load_object(self.crawler.settings['SPIDER_MANAGER_CLASS'])
            self.assertIsInstance(spiders, sm_cls)

            self.crawler.spiders
            self.assertEqual(len(w), 1, "Warn deprecated access only once")

import warnings
import unittest

from twisted.internet import defer

from scrapy.crawler import Crawler, CrawlerRunner
from scrapy.settings import Settings
from scrapy.utils.spider import DefaultSpider
from scrapy.utils.misc import load_object


class CrawlerTestCase(unittest.TestCase):

    def setUp(self):
        self.crawler = Crawler(DefaultSpider, Settings())

    def test_deprecated_attribute_spiders(self):
        with warnings.catch_warnings(record=True) as w:
            spiders = self.crawler.spiders
            self.assertEqual(len(w), 1)
            self.assertIn("Crawler.spiders", str(w[0].message))
            sm_cls = load_object(self.crawler.settings['SPIDER_MANAGER_CLASS'])
            self.assertIsInstance(spiders, sm_cls)

            self.crawler.spiders
            self.assertEqual(len(w), 1, "Warn deprecated access only once")


class CrawlerRunnerTest(unittest.TestCase):

    def setUp(self):
        self.crawler_runner = CrawlerRunner(Settings())

    @defer.inlineCallbacks
    def test_populate_spidercls_settings(self):
        spider_settings = {'TEST1': 'spider', 'TEST2': 'spider'}
        project_settings = {'TEST1': 'project', 'TEST3': 'project'}

        class CustomSettingsSpider(DefaultSpider):
            custom_settings = spider_settings

        self.crawler_runner.settings.setdict(project_settings,
                                             priority='project')

        yield self.crawler_runner.crawl(CustomSettingsSpider)
        crawler = self.crawler_runner.crawlers.pop()
        self.assertEqual(crawler.settings.get('TEST1'), 'spider')
        self.assertEqual(crawler.settings.get('TEST2'), 'spider')
        self.assertEqual(crawler.settings.get('TEST3'), 'project')

Test verifying that CrawlerRunner populates spider class settings
Test verifying that CrawlerRunner populates spider class settings
