Testing applications Django with py.test (Django Stockholm meetup)

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.VMUJQMFUFTUpMFT # Typical contents of app/tests/__init__.py: from .test_foo import * from .test_bar import * from .test_spam import *

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QZUFTUUFTUTUZMF def greeter(name): return 'Hello %s!' % name def test_greeter(): assert greeter('Andreas') == 'Hello Andreas'

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)PXUPSVOUFTUT # run all tests $ py.test # run a specific file $ py.test tests/app/test_views.py # run test which matches tests named *test_foo* $ py.test tests/app/test_views.py -‐k test_foo # run all non database tests (more on this later) $ py.test tests/app -‐m 'not django_db'

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%BUBCBTFVTBHF w 8JUIQZUFTUEKBOHP ZPVNVTUCFFYQMJDJUBCPVU EBUBCBTFBDDFTT w %BUBCBTFBDDFTTJTSFRVFTUFEXJUIUIF pytest.mark.django_dbNBSLFS

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%BUBCBTFVTBHF import pytest def test_without_db_access(): # any db accesses will raise an error pass @pytest.mark.django_db def test_with_db_access(): # test db is available pass

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%BUBCBTFVTBHF import pytest # Allow all tests in this module database access pytestmark = pytest.mark.django_db def test_with_db_access_1(): pass def test_with_db_access_2(): pass def test_with_db_access_3(): pass

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%KBOHPUFTUpYUVSFT [ { "model": "myapp.person", "pk": 1, "fields": { "first_name": "John", "last_name": "Lennon" } }, { "model": "myapp.person", "pk": 2, "fields": { "first_name": "Paul", "last_name": "McCartney" } } ]

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GBDUPSZ@CPZFYBNQMF # models.py from django.db import models class Group(models.Model): name = models.TextField() class Person(models.Model): first_name = models.TextField() last_name = models.TextField() group = models.ForeignKey(Group) def group_letter(self): return self.group.name[0].upper() def full_name(self): return '%s %s' % (self.first_name, self.last_name) # factories.py import factory from app.models import Person, Group class GroupFactory(factory.Factory): FACTORY_FOR = Group name = 'Developers' class PersonFactory(factory.Factory): FACTORY_FOR = Person first_name = 'John' last_name = 'Doe' group = factory.SubFactory(GroupFactory)

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GBDUPSZ@CPZFYBNQMF from factories import PersonFactory def test_full_name(): person = PersonFactory.build(first_name='Andreas', last_name='Pelme') assert person.full_name() == 'Andreas Pelme' def test_group_letter(): person = PersonFactory.build(group__name='admins') assert person.group_letter() == 'A'

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QZUFTUpYUVSFT import pytest from my_module import MyClass @pytest.fixture def my_object(): return MyClass() def test_foo(my_object): assert my_object.foo() == 'foo' def test_bar(my_object): assert my_object.bar() == 'bar'

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QZUFTUEKBOHPpYUVSFT def test_changing_settings(settings): settings.DATE_FORMAT = 'Y-‐m-‐d' # call code that uses settings.DATE_FORMAT ... # the settings will be automatically reset after this test def test_with_testclient(client): # client is an instance of Django's TestClient, just like # self.client in a Django TestCase response = client.get('/foo/bar') assert response.status_code == 200

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'BDUPSZpYUVSFT import pytest from factories import PersonFactory @pytest.fixture def person(): return PersonFactory.build() def test_with_person(person): # Test something on the Person object pass

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'BDUPSZpYUVSFT import pytest from factories import UserFactory @pytest.fixture def user_in_db(db): # The db argument makes database access allowed return UserFactory.create() @pytest.mark.django_db def test_with_saved_user(user_in_db): # user_in_db is a saved user pass

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