Programming

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====== Django Testing ======
<code>
class YourTestClass(TestCase):
    @classmethod
    def setUpTestData(cls):
        print("setUpTestData: Run once to set up non-modified data for all class methods.")
        pass

    def setUp(self):
        print("setUp: Run once for every test method to setup clean data.")
        pass

    def test_false_is_false(self):
        print("Method: test_false_is_false.")
        self.assertFalse(False)

    def test_false_is_true(self):
        print("Method: test_false_is_true.")
        self.assertTrue(False)

    def test_one_plus_one_equals_two(self):
        print("Method: test_one_plus_one_equals_two.")
        self.assertEqual(1 + 1, 2)
</code>

====== RequestFactory ======
<code>
from django.test import TestCase, RequestFactory
from django.contrib.auth.models import AnonymousUser
from ..views import signup
...
self.req_factory = RequestFactory()
...
req = self.req_factory.get('/users/signup')
req.user = AnonymousUser()
# Test my_view() as if it were deployed at /customer/details
response = my_view(request)
# Use this syntax for class-based views.
response = MyView.as_view()(request)
self.assertEqual(response.status_code, 200)
</code>

====== self.client ======
<code>
res = self.client.get('/users/signup')
</code>
<code>
self.client.force_login(User.objects.get_or_create(username='testuser')[0])
self.client.login(...
</code>
====== Mail ======
<code>
from django.core import mail
    def test_send_mail_on_signup(self):
        """
        When a user signs up should receive an email
        """
        email = 'test@test.com'
        self.client.post('/users/signup', {
            'username': 'usertest1',
            'email': email,
            'password1': 'prueb4PRUEB4',
            'password2': 'prueb4PRUEB4'
        })
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(mail.outbox[0].to[0], email)
</code>


====== Articles ======

===== N+1 Queries =====

Lets imagine you are creating a view for returning all the courses with some of their authors data. If you run a code like this:
<code python>
queryset = Course.objects.all()
courses = []
for course in queryset:
  courses.append({"title": course.title, "author": course.author.name})
</code>
This is executing one query (for bringing all courses) and N queries more (one for each author). There is the library [[https://github.com/jmcarp/nplusone|nplusone]] to detect this.
  * {{ :wiki2:python:django:automating_performance_testing_in_django.zip |}}
Programming

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