Django 2.1 Test Issue

Question

first of all thank you for your time and sorry about my english.

Im learning Django, I had several years developing with python and decided to start to check this Framework. And I'm getting an weird responses. Im writting a TestCase, wich works perfectly outside Test.

That is the code:

class BoardTopicsTests(TestCase):
    # Hago las acciones necesarias para empezar el test
    def setUp(self):
        self.board = Board(name="Django", description="Django board.")
        # self.board.save()

    # Compruebo el status_code 200
    def test_board_topics_view_status_code(self):
        # self.board.save()
        url = reverse("board_topics", kwargs={"pk":1})
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)

    # Compruebo el status_code 404
    def test_board_topics_view_not_found_status_code(self):
        url = reverse("board_topics", kwargs={"pk" : 99})
        response = self.client.get(url)
        self.assertEqual(response.status_code, 404)

    # Compruebo que resuelve bien el board
    def test_board_topics_url_resolves_board_topics_views(self):
        view = resolve("/boards/1/")
        self.assertEqual( view.func.__name__, BoardTopics.as_view().__name__ )

If I save the board in setUp the method test_board_topics_view_status_code returns 404, if I save the board inside the method it returns 200 and pass the test.

I think I'm missing something because I think it have to work saving from setUp method!

Please, can somebody help with that? It's just for learning purposes because I want to know whats happening there.

If I do print(self.board.id) inside test_board_topics_view_status_code it returns 1 as it suposed to be.

Thank you very much!

Answer 1

After researching a bit I came with the solution:

@classmethod
def setUpTestData(cls):
    Board.objects.create(name="Django", description="Django board.")

Instead of:

def setUp(self):
    self.board = Board(name="Django", description="Django board.")
    self.board.save()

It works BUT I'm trying to do the same with another class and the 404 still returns... In that particular TestCase works, in another ones dont,oO

I'm researching a bit more, I will write back if I found the "ultimate" solution hehehe.

UPDATE:

Well at the end I found the problem! The solution is the next one:

@classmethod
def setUpTestData(cls):
    self.board = Board.objects.create(name="Django", description="Django board.")

# Compruebo el status_code 200
def test_board_topics_view_status_code(self):
    url = reverse("board_topics", kwargs={"pk":self.board.pk})
    response = self.client.get(url)
    self.assertEqual(response.status_code, 200)

Note that in kwargs the value of pk is self.board.pk insteadof (and here where the error was) hardcoded 1 because we dont know if the PK would be 1!!! Oh that silly error took me one night without sleep.

So at the end we can resume in the next:

• Use setUpTestData instead setUp to add Data
• Dont hardcode pk, store the object you already inserted and return the pk

Hope the answer helps!

Your's S3yk0