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from unittest import TestCase
from scrapy.spiders import Spider
from scrapy.http import Request
from scrapy.downloadermiddlewares.useragent import UserAgentMiddleware
from scrapy.utils.test import get_crawler
class UserAgentMiddlewareTest(TestCase):
def get_spider_and_mw(self, default_useragent):
crawler = get_crawler(Spider, {'USER_AGENT': default_useragent})
spider = crawler._create_spider('foo')
return spider, UserAgentMiddleware.from_crawler(crawler)
def test_default_agent(self):
spider, mw = self.get_spider_and_mw('default_useragent')
req = Request('http://scrapytest.org/')
assert mw.process_request(req, spider) is None
self.assertEquals(req.headers['User-Agent'], 'default_useragent')
def test_remove_agent(self):
# settings UESR_AGENT to None should remove the user agent
spider, mw = self.get_spider_and_mw('default_useragent')
spider.user_agent = None
mw.spider_opened(spider)
req = Request('http://scrapytest.org/')
assert mw.process_request(req, spider) is None
assert req.headers.get('User-Agent') is None
def test_spider_agent(self):
spider, mw = self.get_spider_and_mw('default_useragent')
spider.user_agent = 'spider_useragent'
mw.spider_opened(spider)
req = Request('http://scrapytest.org/')
assert mw.process_request(req, spider) is None
self.assertEquals(req.headers['User-Agent'], 'spider_useragent')
def test_header_agent(self):
spider, mw = self.get_spider_and_mw('default_useragent')
spider.user_agent = 'spider_useragent'
mw.spider_opened(spider)
req = Request('http://scrapytest.org/', headers={'User-Agent': 'header_useragent'})
assert mw.process_request(req, spider) is None
self.assertEquals(req.headers['User-Agent'], 'header_useragent')
def test_no_agent(self):
spider, mw = self.get_spider_and_mw(None)
spider.user_agent = None
mw.spider_opened(spider)
req = Request('http://scrapytest.org/')
assert mw.process_request(req, spider) is None
assert 'User-Agent' not in req.headers
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