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from functools import wraps
from django.db import IntegrityError, connections, transaction
from django.test import TestCase, ignore_warnings, skipUnlessDBFeature
from django.test.testcases import TestData
from django.utils.deprecation import RemovedInDjango41Warning
from .models import Car, Person, 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()
class NonDeepCopyAble:
def __deepcopy__(self, memo):
raise TypeError
def assert_no_queries(test):
@wraps(test)
def inner(self):
with self.assertNumQueries(0):
test(self)
return inner
class TestDataTests(TestCase):
# setUpTestData re-assignment are also wrapped in TestData.
jim_douglas = None
@classmethod
def setUpTestData(cls):
cls.jim_douglas = Person.objects.create(name='Jim Douglas')
cls.car = Car.objects.create(name='1963 Volkswagen Beetle')
cls.herbie = cls.jim_douglas.possessed_cars.create(
car=cls.car,
belongs_to=cls.jim_douglas,
)
cls.non_deepcopy_able = NonDeepCopyAble()
cls.person_binary = Person.objects.create(name='Person', data=b'binary data')
cls.person_binary_get = Person.objects.get(pk=cls.person_binary.pk)
@assert_no_queries
def test_class_attribute_equality(self):
"""Class level test data is equal to instance level test data."""
self.assertEqual(self.jim_douglas, self.__class__.jim_douglas)
self.assertEqual(self.person_binary, self.__class__.person_binary)
self.assertEqual(self.person_binary_get, self.__class__.person_binary_get)
@assert_no_queries
def test_class_attribute_identity(self):
"""
Class level test data is not identical to instance level test data.
"""
self.assertIsNot(self.jim_douglas, self.__class__.jim_douglas)
self.assertIsNot(self.person_binary, self.__class__.person_binary)
self.assertIsNot(self.person_binary_get, self.__class__.person_binary_get)
@assert_no_queries
def test_binaryfield_data_type(self):
self.assertEqual(bytes(self.person_binary.data), b'binary data')
self.assertEqual(bytes(self.person_binary_get.data), b'binary data')
self.assertEqual(
type(self.person_binary_get.data),
type(self.__class__.person_binary_get.data),
)
self.assertEqual(
type(self.person_binary.data),
type(self.__class__.person_binary.data),
)
@assert_no_queries
def test_identity_preservation(self):
"""Identity of test data is preserved between accesses."""
self.assertIs(self.jim_douglas, self.jim_douglas)
@assert_no_queries
def test_known_related_objects_identity_preservation(self):
"""Known related objects identity is preserved."""
self.assertIs(self.herbie.car, self.car)
self.assertIs(self.herbie.belongs_to, self.jim_douglas)
@ignore_warnings(category=RemovedInDjango41Warning)
def test_undeepcopyable(self):
self.assertIs(self.non_deepcopy_able, self.__class__.non_deepcopy_able)
def test_undeepcopyable_warning(self):
msg = (
"Assigning objects which don't support copy.deepcopy() during "
"setUpTestData() is deprecated. Either assign the "
"non_deepcopy_able attribute during setUpClass() or setUp(), or "
"add support for deepcopy() to "
"test_utils.test_testcase.TestDataTests.non_deepcopy_able."
)
with self.assertRaisesMessage(RemovedInDjango41Warning, msg):
self.non_deepcopy_able
def test_repr(self):
self.assertEqual(
repr(TestData('attr', 'value')),
"<TestData: name='attr', data='value'>",
)
class SetupTestDataIsolationTests(TestCase):
"""
In-memory data isolation is respected for model instances assigned to class
attributes during setUpTestData.
"""
@classmethod
def setUpTestData(cls):
cls.car = Car.objects.create(name='Volkswagen Beetle')
def test_book_name_deutsh(self):
self.assertEqual(self.car.name, 'Volkswagen Beetle')
self.car.name = 'VW sKäfer'
self.car.save()
def test_book_name_french(self):
self.assertEqual(self.car.name, 'Volkswagen Beetle')
self.car.name = 'Volkswagen Coccinelle'
self.car.save()
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