Add unittest

Author: aibaq

AUTHORS

@@ -11,6 +11,7 @@ Abhishek Patel
 Adam Johnson
 Adam Zahradník
 Adheeth P Praveen
+Aibek Prenov
 Alan Crosswell
 Alan Rominger
 Alejandro Mantecon Guillen

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * #1584 Fix IDP container in docker compose environment could not find templates and static files.
 * #1562 Fix: Handle AttributeError in IntrospectTokenView
 * #1583 Fix: Missing pt_BR translations
+* #1597 Fix: TypeError at /s/auth/o/token/
 <!--
 ### Security
 -->

tests/test_oauth2_validators.py

@@ -60,6 +60,8 @@ def always_invalid_token():
 class TestOAuth2Validator(TransactionTestCase):
     def setUp(self):
         self.user = UserModel.objects.create_user("user", "[email protected]", "123456")
+        self.user.last_login = None
+        self.user.save()
         self.request = mock.MagicMock(wraps=Request)
         self.request.user = self.user
         self.request.grant_type = "not client"