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from twisted.trial import unittest
from scrapy.settings import Settings
from scrapy.exceptions import NotConfigured
from scrapy.middleware import MiddlewareManager
class M1:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
def process(self, response, request, spider):
pass
class M2:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
pass
class M3:
def process(self, response, request, spider):
pass
class MOff:
def open_spider(self, spider):
pass
def close_spider(self, spider):
pass
def __init__(self):
raise NotConfigured
class TestMiddlewareManager(MiddlewareManager):
@classmethod
def _get_mwlist_from_settings(cls, settings):
return [M1, MOff, M3]
def _add_middleware(self, mw):
super()._add_middleware(mw)
if hasattr(mw, 'process'):
self.methods['process'].append(mw.process)
class MiddlewareManagerTest(unittest.TestCase):
def test_init(self):
m1, m2, m3 = M1(), M2(), M3()
mwman = TestMiddlewareManager(m1, m2, m3)
self.assertEqual(list(mwman.methods['open_spider']), [m1.open_spider, m2.open_spider])
self.assertEqual(list(mwman.methods['close_spider']), [m2.close_spider, m1.close_spider])
self.assertEqual(list(mwman.methods['process']), [m1.process, m3.process])
def test_methods(self):
mwman = TestMiddlewareManager(M1(), M2(), M3())
self.assertEqual(
[x.__self__.__class__ for x in mwman.methods['open_spider']],
[M1, M2])
self.assertEqual(
[x.__self__.__class__ for x in mwman.methods['close_spider']],
[M2, M1])
self.assertEqual(
[x.__self__.__class__ for x in mwman.methods['process']],
[M1, M3])
def test_enabled(self):
m1, m2, m3 = M1(), M2(), M3()
mwman = MiddlewareManager(m1, m2, m3)
self.assertEqual(mwman.middlewares, (m1, m2, m3))
def test_enabled_from_settings(self):
settings = Settings()
mwman = TestMiddlewareManager.from_settings(settings)
classes = [x.__class__ for x in mwman.middlewares]
self.assertEqual(classes, [M1, M3])
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