[IMP] base: improve test coverage
[IMP] base: improve test coverage

The forbidden cases were not tested, making it harder to detect

closes odoo/odoo#36846

Signed-off-by: Martin Trigaux (mat) <cc7c5be316e48d137cbb549833b85d91034d799d@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo