Testing Django applications with py.test (EuroPython 2013)

Transcript

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15. 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!')
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16. def  test_hello_world(client):
           response  =  client.get('/hi/')
         assert  response.status_code  ==  200
         assert  response.content  ==  'Hello  World!'
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17. def  test_hello_world(client):
           response  =  client.get('/hi/')
         assert  response.status_code  ==  200
         assert  response.content  ==  'Hello  World!'
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18. $  py.test
    F
    ===================  FAILURES  ====================
    _______________  test_hello_world  ________________
    client  =  0x1065f58d0>
       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
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19. 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
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21. *OTUBMMTQZUFTUEKBOHPBOEQZUFTU
    pip  install  pytest-­‐django
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22. "EETZPVSQSPKFDUUP1ZUIPOQBUI
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    pip  install  -­‐e  .
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23. %FpOF%KBOHPTFUUJOHTJOZPVSTIFMM
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    export  DJANGO_SETTINGS_MODULE=settings
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    [pytest]
    DJANGO_SETTINGS_MODULE=settings
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27. 3VOBMMUIFUFTUT
    $  py.test
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28. 3VOBMMUFTUTJOBTQFDJpDpMF
    $  py.test  test_views.py
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29. 3VOBMMUFTUDBTFTUIBUBSFOBNFE
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    $  py.test  -­‐k  test_foo
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    test_*.py
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    [pytest]
    python_files  =  *.py
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33. 5FTUTDBOMJWFVOEFS%KBOHPBQQT
    polls/tests/views.py
    blog/tests/views.py
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34. 5FTUTDBOMJWFJOUIFJSPXOSPPUEJSFDUPSZ
    tests/polls/views.py
    tests/blog/models.py
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35. 5FTUTCFTQMJUVQJOUPEJGGFSFOUSPPU
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    unit_tests/blog/models.py
    functional_tests/test_foo.py
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    py.test  -­‐-­‐reuse-­‐db
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    [pytest]
    addopts  =  -­‐-­‐reuse-­‐db
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45. 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)
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46. 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)
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47. #  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'
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48. #  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)
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57. 5IJTXJMMBMMPXEBUBCBTFBDDFTT
    import  pytest
    @pytest.mark.django_db
    def  test_user_count():
           assert  User.objects.count()  ==  0
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    def  test_user_count():
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59. ___________  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
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60. .BSLBOFOUJSFNPEVMFGPSEBUBCBTF
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    import  pytest
    pytestmark  =  pytest.mark.django_db
    def  test_foo():  pass
    def  test_bar():  pass
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61. 3VOBMMUFTUTXIJDIEPFTOPUUPVDIUIF
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63. %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!
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65. 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()
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66. 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)
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67. from  yourfactories  import  PersonFactory
    def  test_group_letter():
           person  =  PersonFactory.build(
                   group__name='admins')
           assert  person.group_letter()  ==  'A'
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68. import  pytest
    @pytest.mark.django_db
    def  test_group_letter():
           person  =  PersonFactory.create(
                   group__name='admins')
           assert  person.group_letter()  ==  'A'
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    def  test_with_client(client):
           response  =  client.get('/foo/')
           assert  response.status_code  ==  200
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    def  test_foo(settings):
           settings.DATE_FORMAT  =  'Y-­‐m-­‐d'
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72. $SFBUFZPVSPXOpYUVSFTXJUI
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    import  pytest
    @pytest.fixture
    def  person():
           return  PersonFactory.build()
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73. 3FRVFTU%KBOHPEBUBCBTFBDDFTT
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    import  pytest
    from  your_factories  import  UserFactory
    @pytest.fixture
    def  person_in_db(db):
           return  PersonFactory.create()
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