Running Django Tests with RequestFactory is returning __init__.py errors

Question

I'm not sure what I'm doing wrong. I'm trying to follow this example: https://docs.djangoproject.com/en/1.6/topics/testing/advanced/#module-django.test.client

I've created my test and the return is odd.

tests.py:

from django.contrib.auth.models import User
from django.test import TestCase
from django.test.client import RequestFactory
from project_name.app_name.views import ViewName

class UrlsViewsTest(TestCase):
    def setUp(self):
        # every test needs access to the request RequestFactory
        self.factory = RequestFactory()
        self.user = User.objects.create_user(username='dave', email='[email protected]', password='top_secret')

    def tearDown(self):
        # Delete those objects that are saved in setup
        self.user.delete()

    def test_view_name(self):
        #Create an instance of a GET request
        request = self.factory.get('/app/')

        # Recall that middleware are not suported. You can simulate a
        # logged-in user by setting request.user manually.
        request.user = self.user

        # Test ViewName() as if it were deployed at /app/
        response = ViewName(request)
        self.assertEqual(response.status_code, 200)

Results:

Creating test database for alias 'default'...
E
======================================================================
ERROR: test_view_name (project_name.app_name.tests.UrlsViewsTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/dave/sandbox/project_name/project_name/app_name/tests.py", line 25, in test_view_name
    response = ViewName(request)
TypeError: __init__() takes exactly 1 argument (2 given)

----------------------------------------------------------------------
Ran 1 test in 0.168s

FAILED (errors=1)
Destroying test database for alias 'default'...

I'm not able to figure out what the following means:

TypeError: __init__() takes exactly 1 argument (2 given)

How do I sort out what that means and how do I fix it?

I've been looking in the Django Google Groups and here on SO. I'm not seeing examples.

Answer 1

You don't need to delete objects in teardown, the test database will reset itself for each test definition in a TestCase class. The teardown is only needed for things like mock and mox that define new code.

Here's a summary of the message thread so this question can be logged as answered:

Solution1:

response = ViewName.as_view()(request)

Solution2:

# ignore importing ViewName and RequestFactory
response = self.client.login_as(user=self.user)
response = self.client.get('/app/')

Solution3: Direct unit testing only the functions you've written

self.view = ViewName()
output = self.view.new_function(input)
self.assertEqual(output, expected)