[py3] Fixed admin_custom_urls tests.

tests/regressiontests/admin_custom_urls/models.py

@@ -28,7 +28,7 @@ class ActionAdmin(admin.ModelAdmin):
         Remove all entries named 'name' from the ModelAdmin instance URL
         patterns list
         """
-        return filter(lambda e: e.name != name, super(ActionAdmin, self).get_urls())
+        return [url for url in super(ActionAdmin, self).get_urls() if url.name != name]
 
     def get_urls(self):
         # Add the URL of our custom 'add_view' view to the front of the URLs

tests/regressiontests/admin_custom_urls/tests.py

@@ -29,10 +29,7 @@ class AdminCustomUrlsTest(TestCase):
     def testAddWithGETArgs(self):
         response = self.client.get('/custom_urls/admin/admin_custom_urls/action/!add/', {'name': 'My Action'})
         self.assertEqual(response.status_code, 200)
-        self.assertTrue(
-            'value="My Action"' in response.content,
-            "Couldn't find an input with the right value in the response."
-        )
+        self.assertContains(response, 'value="My Action"')
 
     def testBasicAddPost(self):
         """