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61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
from twisted.internet import defer
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from twisted.trial.unittest import TestCase
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from scrapy.signals import request_left_downloader
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from scrapy.spiders import Spider
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from scrapy.utils.test import get_crawler
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from tests.mockserver import MockServer
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class SignalCatcherSpider(Spider):
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name = 'signal_catcher'
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def __init__(self, crawler, url, *args, **kwargs):
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super().__init__(*args, **kwargs)
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crawler.signals.connect(self.on_request_left,
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signal=request_left_downloader)
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self.caught_times = 0
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self.start_urls = [url]
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@classmethod
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def from_crawler(cls, crawler, *args, **kwargs):
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spider = cls(crawler, *args, **kwargs)
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return spider
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def on_request_left(self, request, spider):
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self.caught_times += 1
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class TestCatching(TestCase):
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def setUp(self):
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self.mockserver = MockServer()
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self.mockserver.__enter__()
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def tearDown(self):
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self.mockserver.__exit__(None, None, None)
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@defer.inlineCallbacks
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def test_success(self):
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crawler = get_crawler(SignalCatcherSpider)
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yield crawler.crawl(self.mockserver.url("/status?n=200"))
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self.assertEqual(crawler.spider.caught_times, 1)
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@defer.inlineCallbacks
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def test_timeout(self):
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crawler = get_crawler(SignalCatcherSpider,
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{'DOWNLOAD_TIMEOUT': 0.1})
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yield crawler.crawl(self.mockserver.url("/delay?n=0.2"))
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self.assertEqual(crawler.spider.caught_times, 1)
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@defer.inlineCallbacks
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def test_disconnect(self):
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crawler = get_crawler(SignalCatcherSpider)
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yield crawler.crawl(self.mockserver.url("/drop"))
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self.assertEqual(crawler.spider.caught_times, 1)
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@defer.inlineCallbacks
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def test_noconnect(self):
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crawler = get_crawler(SignalCatcherSpider)
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yield crawler.crawl('http://thereisdefinetelynosuchdomain.com')
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self.assertEqual(crawler.spider.caught_times, 1)
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