40 lines
1.6 KiB
Python
40 lines
1.6 KiB
Python
from django.db import IntegrityError, models
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from django.db.models.constraints import BaseConstraint
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from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
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from .models import Product
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class BaseConstraintTests(SimpleTestCase):
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def test_constraint_sql(self):
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c = BaseConstraint('name')
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msg = 'This method must be implemented by a subclass.'
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with self.assertRaisesMessage(NotImplementedError, msg):
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c.constraint_sql(None, None)
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class CheckConstraintTests(TestCase):
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def test_repr(self):
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check = models.Q(price__gt=models.F('discounted_price'))
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name = 'price_gt_discounted_price'
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constraint = models.CheckConstraint(check=check, name=name)
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self.assertEqual(
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repr(constraint),
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"<CheckConstraint: check='{}' name='{}'>".format(check, name),
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)
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def test_deconstruction(self):
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check = models.Q(price__gt=models.F('discounted_price'))
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name = 'price_gt_discounted_price'
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constraint = models.CheckConstraint(check=check, name=name)
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path, args, kwargs = constraint.deconstruct()
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self.assertEqual(path, 'django.db.models.CheckConstraint')
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self.assertEqual(args, ())
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self.assertEqual(kwargs, {'check': check, 'name': name})
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@skipUnlessDBFeature('supports_table_check_constraints')
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def test_database_constraint(self):
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Product.objects.create(name='Valid', price=10, discounted_price=5)
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with self.assertRaises(IntegrityError):
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Product.objects.create(name='Invalid', price=10, discounted_price=20)
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