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from unittest import TextTestResult
from twisted.trial import unittest
from scrapy.spiders import Spider
from scrapy.http import Request
from scrapy.item import Item, Field
from scrapy.contracts import ContractsManager
from scrapy.contracts.default import (
UrlContract,
ReturnsContract,
ScrapesContract,
)
class TestItem(Item):
name = Field()
url = Field()
class ResponseMock(object):
url = 'http://scrapy.org'
class TestSpider(Spider):
name = 'demo_spider'
def returns_request(self, response):
""" method which returns request
@url http://scrapy.org
@returns requests 1
"""
return Request('http://scrapy.org', callback=self.returns_item)
def returns_item(self, response):
""" method which returns item
@url http://scrapy.org
@returns items 1 1
"""
return TestItem(url=response.url)
def returns_dict_item(self, response):
""" method which returns item
@url http://scrapy.org
@returns items 1 1
"""
return {"url": response.url}
def returns_fail(self, response):
""" method which returns item
@url http://scrapy.org
@returns items 0 0
"""
return TestItem(url=response.url)
def returns_dict_fail(self, response):
""" method which returns item
@url http://scrapy.org
@returns items 0 0
"""
return {'url': response.url}
def scrapes_item_ok(self, response):
""" returns item with name and url
@url http://scrapy.org
@returns items 1 1
@scrapes name url
"""
return TestItem(name='test', url=response.url)
def scrapes_dict_item_ok(self, response):
""" returns item with name and url
@url http://scrapy.org
@returns items 1 1
@scrapes name url
"""
return {'name': 'test', 'url': response.url}
def scrapes_item_fail(self, response):
""" returns item with no name
@url http://scrapy.org
@returns items 1 1
@scrapes name url
"""
return TestItem(url=response.url)
def scrapes_dict_item_fail(self, response):
""" returns item with no name
@url http://scrapy.org
@returns items 1 1
@scrapes name url
"""
return {'url': response.url}
def parse_no_url(self, response):
""" method with no url
@returns items 1 1
"""
pass
class ContractsManagerTest(unittest.TestCase):
contracts = [UrlContract, ReturnsContract, ScrapesContract]
def setUp(self):
self.conman = ContractsManager(self.contracts)
self.results = TextTestResult(stream=None, descriptions=False, verbosity=0)
def should_succeed(self):
self.assertFalse(self.results.failures)
self.assertFalse(self.results.errors)
def should_fail(self):
self.assertTrue(self.results.failures)
self.assertFalse(self.results.errors)
def test_contracts(self):
spider = TestSpider()
# extract contracts correctly
contracts = self.conman.extract_contracts(spider.returns_request)
self.assertEqual(len(contracts), 2)
self.assertEqual(frozenset(type(x) for x in contracts),
frozenset([UrlContract, ReturnsContract]))
# returns request for valid method
request = self.conman.from_method(spider.returns_request, self.results)
self.assertNotEqual(request, None)
# no request for missing url
request = self.conman.from_method(spider.parse_no_url, self.results)
self.assertEqual(request, None)
def test_returns(self):
spider = TestSpider()
response = ResponseMock()
# returns_item
request = self.conman.from_method(spider.returns_item, self.results)
request.callback(response)
self.should_succeed()
# returns_dict_item
request = self.conman.from_method(spider.returns_dict_item, self.results)
request.callback(response)
self.should_succeed()
# returns_request
request = self.conman.from_method(spider.returns_request, self.results)
request.callback(response)
self.should_succeed()
# returns_fail
request = self.conman.from_method(spider.returns_fail, self.results)
request.callback(response)
self.should_fail()
# returns_dict_fail
request = self.conman.from_method(spider.returns_dict_fail, self.results)
request.callback(response)
self.should_fail()
def test_scrapes(self):
spider = TestSpider()
response = ResponseMock()
# scrapes_item_ok
request = self.conman.from_method(spider.scrapes_item_ok, self.results)
request.callback(response)
self.should_succeed()
# scrapes_dict_item_ok
request = self.conman.from_method(spider.scrapes_dict_item_ok, self.results)
request.callback(response)
self.should_succeed()
# scrapes_item_fail
request = self.conman.from_method(spider.scrapes_item_fail,
self.results)
request.callback(response)
self.should_fail()
# scrapes_dict_item_fail
request = self.conman.from_method(spider.scrapes_dict_item_fail,
self.results)
request.callback(response)
self.should_fail()
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