Django: How to test a not-null field

Question

I'm trying to make an unit test fail when a not-null field is not set in my model:

class Foo(models.Model):
    email = models.EmailField(
        unique=True,
        null=False,
        blank=False)

def testFoo(self):
    try:
        Foo.objects.create().save()
    except:
        self.fail("error!")

But it never fails.

The email format and not-null validations work perfectly when the application is running but I can't write the test.

Of course I can do the validations programmatically but I don't want to repeat myself. Any ideas?

Answer 1

Okay, you have a few issues, let me enumerate:

1. The save is superfluous. create already does the save.

2. Creating objects does not trigger validation of things like "is this email a valid email". If you tried to pass in email=None it would fail because of your null=False parameter to the field, but the default for email is '', so it's not failing at that level. If you want to validate whether the email is valid or not, do this:

   def testFoo(self):
       try:
           a = Foo.objects.create()
           a.clean_fields()
       except:
           self.fail("error!")