>
> Great! Thank you for the explanation, it's what exactly I want to know,
>> really helps a lot. ;-)
>>
>
nm於 2018年12月13日星期四 UTC+8下午10時25分36秒寫道：
>
> Regarding the first question and the problem with retrieving the user with
> `pk=1`:
> When you run your tests, Django creates a test database where all the
> objects created by the test cases are stored, and which is destroyed after
> all the tests are run. Each user you create gets a *new* pk. The pk number
> is always incremented, regardless of whether the user with a previous pk
> was deleted in the meantime or not (btw, this works the same in your
> "regular" database, you can try adding and deleting users in the shell and
> see yourself). So when you run both test cases and in each test case you
> create one user, one of them gets `pk=1`, and the other `pk=2`. However, if
> you use the `setUpTestData` method in a test case, all the objects created
> by this methods are deleted after *this test case* finishes. This means
> that the first test case creates a user (pk=1), then this user is deleted,
> and the second test case creates another user (pk=2). Then you try to
> retrieve the user with pk=1, which fails.
>
> By the way, the order in which tests are run is not always the same, so
> you should not rely on it in your tests. Assigning created object to class
> attributes, as you did later, is a much better approach.
>
> Hope this is what you wanted to know (;
>
>
> W dniu wtorek, 11 grudnia 2018 05:00:07 UTC+1 użytkownik ANi napisał:
>>
>> Hello,
>> I am now trying to write test cases for my project, but I find some
>> problems.
>>
>> 1.
>>
>>
>> class FirstTest(TestCase):
>>
>> @classmethod
>> def setUpTestData(cls):
>> User.objects.create(username = 'johndoe', password =
>> 'goodtobehere123')
>> ...
>>
>> def test_case_one(self):
>> user = User.objects.get(pk=1)
>> # some assertions here
>>
>> ...
>>
>> class SecondTest(TestCase):
>>
>> @classmethod
>> def setUpTestData(cls):
>> User.objects.create(username = 'janedoe', password =
>> 'nicetobethere456')
>>
>> def test_case_one(self):
>> user = User.objects.get(pk=1)
>> # some assertions here
>>
>> ...
>>
>>
>> If I run all the tests together, I can pass the FirstTest while getting
>> error of "django.contrib.auth.models.DoesNotExist: User matching query does
>> not exist." on the SecondTest.
>> If I run two test cases separately, all tests are passed.
>> Then solved it by changing it into this:
>>
>>
>> class FirstTest(TestCase):
>>
>> @classmethod
>> def setUpTestData(cls):
>> cls.user = User.objects.create(username = 'johndoe', password =
>> 'goodtobehere123')
>> ...
>>
>> def test_case_one(self):
>> self.assertEqual(self.user.somefunc(), something)
>> # some assertions here
>>
>> ...
>>
>> class SecondTest(TestCase):
>>
>> @classmethod
>> def setUpTestData(cls):
>> cls.user = User.objects.create(username = 'janedoe', password =
>> 'nicetobethere456')
>> ...
>>
>> def test_case_one(self):
>> self.assertEqual(self.user.somefunc(), something)
>> # some assertions here
>>
>> ...
>>
>>
>>
>> However I don't know why.....?????
>>
>>
>> 2.
>>
>> class ViewTest(TestCase):
>>
>> @classmethod
>> def setUpTestData(cls):
>> cls.user = User.objects.create(username = 'johndoe', password =
>> 'goodtobehere123')
>> ...
>>
>> def setUp(self):
>> self.item = Item.objects.create(
>> category = 1,
>> item_content = 'content content',
>> )
>>
>>
>> def test_item_update(self):
>> # the view will update the item and return HTTP status code 200.
>> # if the item is not exist, raise Http404
>> self.c = Client()
>> resp = self.c.post(
>> reverse('update_item', kwargs={"pk":self.item.pk}),
>> data = {
>> "category": 2,
>> "content": "item content",
>> }
>> )
>>
>> self.assertEqual(resp.status_code, 200)
>> self.assertEqual(self.item.category, 2)
>>
>> def test_item_delete(self):
>> # the view will delete the item and return HTTP status code 200.
>> # if the item is not exist, raise Http404
>> self.c = Client()
>> resp = self.c.post(
>> reverse('delete_item'),
>> data = {
>> "pk": self.item.pk
>> }
>> )
>>
>> self.assertEqual(resp.status_code, 200)
>>
>>
>>
>>
>> I got " AssertionError: 1 != 2 ". for test_item_update()
>> and "AssertionError: 404 != 200". for test_item_delete()
>>
>> I think it is reasonable but obviously I misunderstand something.
>>
>> Thank you. I will be very happy if you want to help me >___<
>>
>>
>>
>>
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