added offside spider middleware test

scrapy/tests/test_spidermiddleware_offsite.py

@@ -0,0 +1,32 @@
+from unittest import TestCase
+
+from scrapy.http import Response, Request
+from scrapy.spider import BaseSpider
+from scrapy.contrib.spidermiddleware.offsite import OffsiteMiddleware
+
+
+class TestOffsiteMiddleware(TestCase):
+
+    def setUp(self):
+        self.spider = BaseSpider()
+        self.spider.domain_name = 'scrapytest.org'
+        self.spider.extra_domain_names = ['scrapy.org']
+
+        self.mw = OffsiteMiddleware()
+        self.mw.domain_opened(self.spider)
+
+    def test_process_spider_output(self):
+        res = Response('http://scrapytest.org')
+
+        onsite_reqs = [Request('http://scrapytest.org/1'),
+                       Request('http://scrapy.org/1'),
+                       Request('http://sub.scrapy.org/1')]
+        offsite_reqs = [Request('http://scrapy2.org')]
+        reqs = onsite_reqs + offsite_reqs
+
+        out = list(self.mw.process_spider_output(res, reqs, self.spider))
+        self.assertEquals(out, onsite_reqs)
+
+    def tearDown(self):
+        self.mw.domain_closed(self.spider)
+