APIClient giving Model.user must be a "User" instance when trying to test a view

[Massakera]

Hello, I've been trying to write a test using the following code with APIClient for the cardgame that I've built:

class ViewTestCase(TestCase):
   def setUp(self):
   self.user = User.objects.create_user(first_name='tester',
   username='test1', 
   password='123', 
   email='[email protected]')

def test_room_creation(self):
    c = APIClient()
    view = inicioSala.as_view()
    user = User.objects.get(username='test1')
    payload = {"titlePlanning": "Testroom1","styleCards": "Fibonnaci","deck": ["1","2","3"]}
    request = c.post('/room', payload, format='json')
    c.force_authenticate(request, user=user,token=user.auth_token)
    response = view(request)
    print(response)

This is the data that I need to send to test my POST mehod:

 def post(self, request, format=None):
    data= self.request.data
    user = request.user
    name = data['titlePlanning'].strip()
    styleCards = data['styleCards']
    cards = data['deck']

but i'm getting the following error and I don't know how to solve:

ValueError: Cannot assign "<django.contrib.auth.models.AnonymousUser object at 0x7fba0ef645b0>": "PokerRoom.user" must be a "User" instance.

Can someone help me?