Getting error when running automated test on register APIView using Django Rest Framework testing

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Hello everyone, I’m seeing errors when I run automated tests for my Register APIView API endpoint. I’m building a test with DRF and I think I set up everything correctly, I’m following the DRF docs.

Here is my automated test (test_register.py)

class UserRegisterTests(APITestCase):
def test_register_user(self):

    url = reverse('arborfindr:register')
    data = {'email': '[email protected]', 'password': 'mypassword123'}
    response = self.client.post(url, data, format='json')
    self.assertEqual(response.status_code, status.HTTP_201_CREATED)
    self.assertEqual(User.objects.count(), 2)
    self.assertEqual(User.objects.post().email, '[email protected]')
    self.assertTrue(User.objects.check_password('mypassword123'))

register serializers

class RegisterSerializer(serializers.ModelSerializer):
password = serializers.CharField(style={'input_type': 'password'}, write_only=True)

class Meta:
    model = User
    fields = ['email', 'username', 'password']
    extra_kwargs = {
        'password': {'write_only': True}
    }
    
def validate(self, valid):
    if valid['password'] != valid['password']:
        raise serializers.ValidationError({"password": "Passwords do not match."})
    return valid

def create(self, validated_data):
    user = User.objects.create_user(
        email=validated_data['email'],
        username=validated_data['username'],
        password=validated_data['password']
    )
    return user

views.py

API endpoint for registration

@authentication_classes([JWTAuthentication])
class RegisterView(APIView):
def post(self, request):
serializer = RegisterSerializer(data=request.data, context={'request': request})
if serializer.is_valid():
serializer.save()

  return Response({
    'message': 'successfully registered',  
  }, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Finally here is the error traceback

Found 1 test(s).
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
F

FAIL: test_register_user (arborfindr.test.test_register.UserRegisterTests.test_register_user)

Traceback (most recent call last):
File "/home/coreyj/Documents/ArborHub/MyProject/arborfindr/test/test_register.py", line 12, in test_register_user
self.assertEqual(response.status_code, status.HTTP_201_CREATED)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 400 != 201

---

Ran 1 test in 0.015s

Here is the link to the example I followed for testing with DRF Testing - Django REST framework.

Please I need help with this, in the docs the Response is set to status.HTTP_201_CREATED but not sure if I should change the status code.

Please let me know if you need anything else from me.