python3: define a FileType in tests/test_commands.py (#32815)

as file is not a builtin anymore

tests/test_commands.py

@@ -19,6 +19,7 @@ import importlib
 import json
 
 from django.core import management
+from django.utils import six
 from django.utils.timezone import now
 import py
 
@@ -26,6 +27,12 @@ from authentic2.models import Attribute, DeletedUser
 from authentic2_auth_oidc.models import OIDCProvider
 from django_rbac.utils import get_ou_model
 
+if six.PY2:
+    FileType = file
+else:
+    from io import TextIOWrapper, BufferedReader, BufferedWriter
+    FileType = (TextIOWrapper, BufferedReader, BufferedWriter)
+
 
 def test_changepassword(db, simple_user, monkeypatch):
     import getpass