[1.6.x] Fixed #21118 -- Isolated a test that uses the database.

Thanks rmboggs for the report.

Backport of 4f40b97d97 from master

tests/utils_tests/test_simplelazyobject.py

@@ -4,6 +4,8 @@ import copy
 import pickle
 import sys
 
+from django.contrib.auth.models import User
+from django.test import TestCase as DjangoTestCase
 from django.utils import six
 from django.utils.unittest import TestCase
 from django.utils.functional import SimpleLazyObject, empty
@@ -162,9 +164,19 @@ class TestUtilsSimpleLazyObject(TestCase):
         self.assertTrue(lazy1 != lazy3)
         self.assertFalse(lazy1 != lazy2)
 
-    def test_pickle_py2_regression(self):
-        from django.contrib.auth.models import User
+    def test_list_set(self):
+        lazy_list = SimpleLazyObject(lambda: [1, 2, 3, 4, 5])
+        lazy_set = SimpleLazyObject(lambda: set([1, 2, 3, 4]))
+        self.assertTrue(1 in lazy_list)
+        self.assertTrue(1 in lazy_set)
+        self.assertFalse(6 in lazy_list)
+        self.assertFalse(6 in lazy_set)
+        self.assertEqual(len(lazy_list), 5)
+        self.assertEqual(len(lazy_set), 4)
 
+class TestUtilsSimpleLazyObjectDjangoTestCase(DjangoTestCase):
+
+    def test_pickle_py2_regression(self):
         # See ticket #20212
         user = User.objects.create_user('johndoe', 'john@example.com', 'pass')
         x = SimpleLazyObject(lambda: user)