1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
from django.db import IntegrityError, models
from django.db.models.constraints import BaseConstraint
from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
from .models import Product
class BaseConstraintTests(SimpleTestCase):
def test_constraint_sql(self):
c = BaseConstraint('name')
msg = 'This method must be implemented by a subclass.'
with self.assertRaisesMessage(NotImplementedError, msg):
c.constraint_sql(None, None)
class CheckConstraintTests(TestCase):
def test_repr(self):
check = models.Q(price__gt=models.F('discounted_price'))
name = 'price_gt_discounted_price'
constraint = models.CheckConstraint(check=check, name=name)
self.assertEqual(
repr(constraint),
"<CheckConstraint: check='{}' name='{}'>".format(check, name),
)
def test_deconstruction(self):
check = models.Q(price__gt=models.F('discounted_price'))
name = 'price_gt_discounted_price'
constraint = models.CheckConstraint(check=check, name=name)
path, args, kwargs = constraint.deconstruct()
self.assertEqual(path, 'django.db.models.CheckConstraint')
self.assertEqual(args, ())
self.assertEqual(kwargs, {'check': check, 'name': name})
@skipUnlessDBFeature('supports_table_check_constraints')
def test_database_constraint(self):
Product.objects.create(name='Valid', price=10, discounted_price=5)
with self.assertRaises(IntegrityError):
Product.objects.create(name='Invalid', price=10, discounted_price=20)
|
