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from unittest import TestCase
from scrapy.downloadermiddlewares.stats import DownloaderStats
from scrapy.http import Request, Response
from scrapy.spiders import Spider
from scrapy.utils.test import get_crawler
class MyException(Exception):
pass
class TestDownloaderStats(TestCase):
def setUp(self):
self.crawler = get_crawler(Spider)
self.spider = self.crawler._create_spider('scrapytest.org')
self.mw = DownloaderStats(self.crawler.stats)
self.crawler.stats.open_spider(self.spider)
self.req = Request('http://scrapytest.org')
self.res = Response('scrapytest.org', status=400)
def assertStatsEqual(self, key, value):
self.assertEqual(
self.crawler.stats.get_value(key, spider=self.spider),
value,
str(self.crawler.stats.get_stats(self.spider))
)
def test_process_request(self):
self.mw.process_request(self.req, self.spider)
self.assertStatsEqual('downloader/request_count', 1)
def test_process_response(self):
self.mw.process_response(self.req, self.res, self.spider)
self.assertStatsEqual('downloader/response_count', 1)
def test_process_exception(self):
self.mw.process_exception(self.req, MyException(), self.spider)
self.assertStatsEqual('downloader/exception_count', 1)
self.assertStatsEqual(
'downloader/exception_type_count/tests.test_downloadermiddleware_stats.MyException',
1
)
def tearDown(self):
self.crawler.stats.close_spider(self.spider, '')
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