diff --git a/scrapy/tests/test_utils_url.py b/scrapy/tests/test_utils_url.py
index deda64398..3bc56b5c3 100644
--- a/scrapy/tests/test_utils_url.py
+++ b/scrapy/tests/test_utils_url.py
@@ -54,15 +54,11 @@ class UrlUtilsTest(unittest.TestCase):
 
         spider = BaseSpider(name='example.com', allowed_domains=('example.com', 'example.net'))
         self.assertTrue(url_is_from_spider('http://www.example.com/some/page.html', spider))
-        self.assertFalse(url_is_from_spider('http://www.example.org/some/page.html', spider))
-
-        spider = BaseSpider(name='example.com', allowed_domains={'example.org': None})
-        self.assertTrue(url_is_from_spider('http://www.example.org/some/page.html', spider))
 
     def test_url_is_from_spider_with_allowed_domains_class_attributes(self):
         class MySpider(BaseSpider):
             name = 'example.com'
-            allowed_domains = ['example.org', 'example.net']
+            allowed_domains = ('example.org', 'example.net')
         self.assertTrue(url_is_from_spider('http://www.example.com/some/page.html', MySpider))
         self.assertTrue(url_is_from_spider('http://sub.example.com/some/page.html', MySpider))
         self.assertTrue(url_is_from_spider('http://example.com/some/page.html', MySpider))
@@ -70,16 +66,6 @@ class UrlUtilsTest(unittest.TestCase):
         self.assertTrue(url_is_from_spider('http://www.example.net/some/page.html', MySpider))
         self.assertFalse(url_is_from_spider('http://www.example.us/some/page.html', MySpider))
 
-        class MySetSpider(BaseSpider):
-            name = 'example.com'
-            allowed_domains = set(('example.org', 'example.net'))
-        self.assertTrue(url_is_from_spider('http://www.example.com/some/page.html', MySetSpider))
-        self.assertTrue(url_is_from_spider('http://sub.example.com/some/page.html', MySetSpider))
-        self.assertTrue(url_is_from_spider('http://example.com/some/page.html', MySetSpider))
-        self.assertTrue(url_is_from_spider('http://www.example.org/some/page.html', MySetSpider))
-        self.assertTrue(url_is_from_spider('http://www.example.net/some/page.html', MySetSpider))
-        self.assertFalse(url_is_from_spider('http://www.example.us/some/page.html', MySetSpider))
-
     def test_canonicalize_url(self):
         # simplest case
         self.assertEqual(canonicalize_url("http://www.example.com/"),