Testing Django applications with py.test (EuroPython 2013)

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from django.test import TestCase class TestHelloWorld(TestCase): def test_hello_world(self): response = self.client.get('/hi/') self.assertEqual(response.status_code, 200) self.assertEqual(response.content, 'Hello World!') fredag 5 juli 13

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def test_hello_world(client): response = client.get('/hi/') assert response.status_code == 200 assert response.content == 'Hello World!' fredag 5 juli 13

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def test_hello_world(client): response = client.get('/hi/') assert response.status_code == 200 assert response.content == 'Hello World!' fredag 5 juli 13

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$ py.test F =================== FAILURES ==================== _______________ test_hello_world ________________ client = def test_hello_world(client): response = client.get('/hi/') assert response.status_code == 200 > assert response.content == 'Hello World!' E assert 'Hello EuroPython!' == 'Hello World!' E -‐ Hello EuroPython! E + Hello World! test_hello_world.py:5: AssertionError fredag 5 juli 13

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assertAlmostEqual assertAlmostEquals assertDictContainsSubset assertDictEqual assertEqual assertEquals assertFalse assertGreater assertGreaterEqual assertIn assertIs assertIsInstance assertIsNone assertIsNot assertIsNotNone assertItemsEqual assertLess assertLessEqual assertListEqual assertMultiLineEqual assertNotAlmostEqual assertNotAlmostEquals assertNotEqual assertNotEquals assertNotIn assertNotIsInstance assertNotRegexpMatches assertRaises assertRaisesRegexp assertRegexpMatches assertSequenceEqual assertSetEqual assertTrue assertTupleEqual fredag 5 juli 13

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*OTUBMMTQZUFTUEKBOHPBOEQZUFTU pip install pytest-‐django fredag 5 juli 13

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"EETZPVSQSPKFDUUP1ZUIPOQBUI SFRVJSFTBTFUVQQZUPCFQSFTFOU pip install -‐e . fredag 5 juli 13

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%FpOF%KBOHPTFUUJOHTJOZPVSTIFMM FOWJSPONFOU export DJANGO_SETTINGS_MODULE=settings fredag 5 juli 13

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$BOBMTPCFDPOpHVSFEJOQZUFTUJOJ [pytest] DJANGO_SETTINGS_MODULE=settings fredag 5 juli 13

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3VOBMMUIFUFTUT $ py.test fredag 5 juli 13

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3VOBMMUFTUTJOBTQFDJpDpMF $ py.test test_views.py fredag 5 juli 13

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3VOBMMUFTUDBTFTUIBUBSFOBNFE UFTU@GPP $ py.test -‐k test_foo fredag 5 juli 13

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5FTUTDBOMJWFVOEFS%KBOHPBQQT polls/tests/views.py blog/tests/views.py fredag 5 juli 13

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5FTUTDBOMJWFJOUIFJSPXOSPPUEJSFDUPSZ tests/polls/views.py tests/blog/models.py fredag 5 juli 13

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5FTUTCFTQMJUVQJOUPEJGGFSFOUSPPU EJSFDUPSJFT unit_tests/blog/models.py functional_tests/test_foo.py fredag 5 juli 13

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from datetime import datetime, time from django.http import HttpResponse def greet(request): now = datetime.now().time() if time(5) < now < time(12): greeting = 'morning' elif time(18) < now < time(21): greeting = 'evening' else: greeting = 'day' return HttpResponse('Good %s!' % greeting) fredag 5 juli 13

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# greeter.py from datetime import time def greeting_at(time_of_day): if time(5) < time_of_day < time(12): return 'morning' elif time(18) < time_of_day < time(21): return 'evening' else: return 'day' fredag 5 juli 13

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# views.py from datetime import time from django.http import HttpResponse from .greeter import greeting_at def greet(request): now = datetime.now().time() greeting = greeting_at(now) return HttpResponse('Good %s!' % greeting) fredag 5 juli 13

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5IJTXJMMBMMPXEBUBCBTFBDDFTT import pytest @pytest.mark.django_db def test_user_count(): assert User.objects.count() == 0 fredag 5 juli 13

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5IJTXJMMGBJM EBUBCBTFBDDFTTJTOPU BMMPXFE def test_user_count(): assert User.objects.count() == 0 fredag 5 juli 13

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___________ test_user_count ____________ test_db_access.py:4: in test_user_count > assert User.objects.count() == 0 ... snip ... E Failed: Database access not allowed, use the "django_db" mark to enable fredag 5 juli 13

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.BSLBOFOUJSFNPEVMFGPSEBUBCBTF VTBHF import pytest pytestmark = pytest.mark.django_db def test_foo(): pass def test_bar(): pass fredag 5 juli 13

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3VOBMMUFTUTXIJDIEPFTOPUUPVDIUIF EBUBCBTF $ py.test -‐m 'not django_db' fredag 5 juli 13

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%KBOHPpYUVSFT [{"model": "myapp.person", "pk": 1, "fields": {"first_name": "John", "last_name": "Lennon"}}, {"model": "myapp.person", "pk": 2, "fields": {"first_name": "Paul", "last_name": "McCartney"}} ] Slow & hard to maintain.. avoid them! fredag 5 juli 13

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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() fredag 5 juli 13

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import factory from yourapp.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) fredag 5 juli 13

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from yourfactories import PersonFactory def test_group_letter(): person = PersonFactory.build( group__name='admins') assert person.group_letter() == 'A' fredag 5 juli 13

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import pytest @pytest.mark.django_db def test_group_letter(): person = PersonFactory.create( group__name='admins') assert person.group_letter() == 'A' fredag 5 juli 13

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(FUBOJOTUBODFPGUIFUFTUDMJFOU def test_with_client(client): response = client.get('/foo/') assert response.status_code == 200 fredag 5 juli 13

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5IFTFUUJOHTXJMMCFBVUPNBUJDBMMZSFTFU BGUFSUIFUFTU def test_foo(settings): settings.DATE_FORMAT = 'Y-‐m-‐d' fredag 5 juli 13

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$SFBUFZPVSPXOpYUVSFTXJUI QZUFTUpYUVSF import pytest @pytest.fixture def person(): return PersonFactory.build() fredag 5 juli 13

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3FRVFTU%KBOHPEBUBCBTFBDDFTT JOBpYUVSF import pytest from your_factories import UserFactory @pytest.fixture def person_in_db(db): return PersonFactory.create() fredag 5 juli 13

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