diff --git a/net/xeaf/rack/tests/models/mixins/expired_at_mixin_tests.py b/net/xeaf/rack/tests/models/mixins/expired_at_mixin_tests.py
index b90c8e2..fa76083 100644
--- a/net/xeaf/rack/tests/models/mixins/expired_at_mixin_tests.py
+++ b/net/xeaf/rack/tests/models/mixins/expired_at_mixin_tests.py
@@ -55,15 +55,26 @@ class ExpiresAtMixinTests(TransactionTestCase):
         with connection.cursor() as cursor:
             cursor.execute('PRAGMA foreign_keys = ON;')
 
-    def test_expires_at_required(self):
+    def test_expires_at_not_required(self):
         """
-        Проверяем, что expires_at обязательное поле
+        Проверяем, что expires_at не обязательное поле
         """
 
         field = self.TestModel._meta.get_field('expires_at')
-        self.assertFalse(field.null)
+        self.assertTrue(field.null)
         self.assertIsInstance(field, DateTimeField)
-        self.assertFalse(field.blank)
+        self.assertTrue(field.blank)
+
+    def test_expires_at_with_none_never_expires(self):
+        """
+        Проверяем, что при expires_at == None срок действия не ограничен
+        """
+
+        instance = self.TestModel.objects.create(
+            name='Test Instance',
+            expires_at=None
+        )
+        self.assertFalse(instance.is_expired())
 
     def test_renew_sets_expiration_time(self):
         """
@@ -101,6 +112,7 @@ class ExpiresAtMixinTests(TransactionTestCase):
         """
         Проверяем, что renew(save=False) НЕ сохраняет в БД
         """
+
         instance = self.TestModel.objects.create(
             name='Test Instance',
             expires_at=timezone.now() + timedelta(days=1)