Crash tests __slots__ when Mixin is not from trytond module
Since #10719 (closed) , the test add check slots but in case a class import from other class that is not trytond module, has not slot is not defined.
Traceback (most recent call last): File "/home/raimon/projectes/nandev/nancore/trytond/trytond/tests/test_tryton.py", line 204, in wrapper result = func(*args, **kwargs) File "/home/raimon/projectes/nandev/nancore/trytond/trytond/tests/test_tryton.py", line 761, in test_pool_slots % (kls, type_, name)) AssertionError: False is not true : The <class 'flask_login.mixins.UserMixin'> of model 'galatea.user' has no slots