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from django.db import IntegrityError, connections, transaction
from django.test import TestCase, skipUnlessDBFeature
from .models import Car, PossessedCar
class TestTestCase(TestCase):
@skipUnlessDBFeature('can_defer_constraint_checks')
@skipUnlessDBFeature('supports_foreign_keys')
def test_fixture_teardown_checks_constraints(self):
rollback_atomics = self._rollback_atomics
self._rollback_atomics = lambda connection: None # noop
try:
car = PossessedCar.objects.create(car_id=1, belongs_to_id=1)
with self.assertRaises(IntegrityError), transaction.atomic():
self._fixture_teardown()
car.delete()
finally:
self._rollback_atomics = rollback_atomics
def test_disallowed_database_connection(self):
message = (
"Database connections to 'other' are not allowed in this test. "
"Add 'other' to test_utils.test_testcase.TestTestCase.databases to "
"ensure proper test isolation and silence this failure."
)
with self.assertRaisesMessage(AssertionError, message):
connections['other'].connect()
with self.assertRaisesMessage(AssertionError, message):
connections['other'].temporary_connection()
def test_disallowed_database_queries(self):
message = (
"Database queries to 'other' are not allowed in this test. "
"Add 'other' to test_utils.test_testcase.TestTestCase.databases to "
"ensure proper test isolation and silence this failure."
)
with self.assertRaisesMessage(AssertionError, message):
Car.objects.using('other').get()
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