Modify comment and fix failing unit test (new error being raised)

Author: JamesDemeryNava

apps/dot_ext/tests/test_authorization.py

@@ -8,7 +8,6 @@
 # from oauth2_provider.compat import parse_qs, urlparse
 from oauthlib.oauth2.rfc6749.errors import AccessDeniedError as AccessDeniedTokenCustomError
 from oauth2_provider.models import get_access_token_model, get_refresh_token_model
-from django.core.exceptions import PermissionDenied
 from django.http import HttpRequest
 from django.urls import reverse
 from django.test import Client
@@ -1122,5 +1121,5 @@ def test_permission_denied_raised_for_refresh_token_app_not_in_flag(
         # Create an instance of the view
         view_instance = TokenView()
 
-        with self.assertRaises(PermissionDenied):
+        with self.assertRaises(AccessDeniedTokenCustomError):
             view_instance.validate_v3_token_call(request)

apps/dot_ext/views/authorization.py

@@ -482,9 +482,10 @@ def post(self, request, *args, **kwargs):
         version = get_api_version_number_from_url(path_info)
         url_query = parse_qs(request._body.decode('utf-8'))
         grant_type = url_query.get('grant_type', [None])
-        # If it is not version 3, we don't need to check anything, just return
-        # We only want to execute this on refresh_token grant types, not authorization_code
         try:
+            # If it is not version 3, we don't need to check that the application is in the v3_early_adopter flag,
+            # just continue with standard validation.
+            # Also, we only want to execute this on refresh_token grant types, not authorization_code
             if version == Versions.V3 and grant_type[0] and grant_type[0] == 'refresh_token':
                 self.validate_v3_token_call(request)
             self.validate_token_endpoint_request_body(request)