When I save a User model, I would like to check if it has a username. Therefore I wrote this pre_save
:
@receiver(pre_save, sender=User)
def validate_user(sender, instance, **kwargs):
if len(instance.username) <= 5: raise Exception("Username too short")
Now in my testing method I would like to test this exception:
def test_user_no_username(self):
u = User.objects.create()
self.assertRaises(Exception, u.save())
The test fails. Why?
assertRaises
is kind of a specific exception - as a second argument you should pass a callable :
assertRaises(exception, callable, *args, **kwds)
In other words, don't call u.save()
:
self.assertRaises(Exception, u.save)
Also, you should really think about having custom exceptions or using built-in Django validation errors instead of raising and catching the broad Exception
.
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