1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
from twisted.internet import defer
from twisted.trial.unittest import TestCase
from scrapy.signals import request_left_downloader
from scrapy.spiders import Spider
from scrapy.utils.test import get_crawler
from tests.mockserver import MockServer
class SignalCatcherSpider(Spider):
name = 'signal_catcher'
def __init__(self, crawler, url, *args, **kwargs):
super().__init__(*args, **kwargs)
crawler.signals.connect(self.on_request_left,
signal=request_left_downloader)
self.caught_times = 0
self.start_urls = [url]
@classmethod
def from_crawler(cls, crawler, *args, **kwargs):
spider = cls(crawler, *args, **kwargs)
return spider
def on_request_left(self, request, spider):
self.caught_times = self.caught_times + 1
class TestCatching(TestCase):
def setUp(self):
self.mockserver = MockServer()
self.mockserver.__enter__()
def tearDown(self):
self.mockserver.__exit__(None, None, None)
@defer.inlineCallbacks
def test_success(self):
crawler = get_crawler(SignalCatcherSpider)
yield crawler.crawl(self.mockserver.url("/status?n=200"))
self.assertEqual(crawler.spider.caught_times, 1)
@defer.inlineCallbacks
def test_timeout(self):
crawler = get_crawler(SignalCatcherSpider,
{'DOWNLOAD_TIMEOUT': 0.1})
yield crawler.crawl(self.mockserver.url("/delay?n=0.2"))
self.assertEqual(crawler.spider.caught_times, 1)
@defer.inlineCallbacks
def test_disconnect(self):
crawler = get_crawler(SignalCatcherSpider)
yield crawler.crawl(self.mockserver.url("/drop"))
self.assertEqual(crawler.spider.caught_times, 1)
@defer.inlineCallbacks
def test_noconnect(self):
crawler = get_crawler(SignalCatcherSpider)
yield crawler.crawl('http://thereisdefinetelynosuchdomain.com')
self.assertEqual(crawler.spider.caught_times, 1)
|
