Test-Driven Django Development

Our first test: str method

from django.test import TestCase

from .models import Entry


class EntryModelTest(TestCase):

    def test_string_representation(self):
        entry = Entry(title="My entry title")
        self.assertEqual(str(entry), entry.title)

Test pluralization

    def test_verbose_name_plural(self):
        self.assertEqual(str(Entry._meta.verbose_name_plural), "entries")

The homepage test

class ProjectTests(TestCase):

    def test_homepage(self):
        response = self.client.get('/')
        self.assertEqual(response.status_code, 200)

404 test en WMS_IQ project

    def test_judge_list_user_has_none_agency_returns_404(self):
        url = reverse('agency:judge_list')
        self.user.agency = None
        self.user.save()
        response = self.client.get(url)

        self.assertEqual(response.status_code, 404)

Testing entries

from django.contrib.auth import get_user_model

class HomePageTests(TestCase):

    """Test whether our blog entries show up on the homepage"""

    def setUp(self):
        self.user = get_user_model().objects.create(username='some_user')

    def test_one_entry(self):
        Entry.objects.create(title='1-title', body='1-body', author=self.user)
        response = self.client.get('/')
        self.assertContains(response, '1-title')
        self.assertContains(response, '1-body')

    def test_two_entries(self):
        Entry.objects.create(title='1-title', body='1-body', author=self.user)
        Entry.objects.create(title='2-title', body='2-body', author=self.user)
        response = self.client.get('/')
        self.assertContains(response, '1-title')
        self.assertContains(response, '1-body')
        self.assertContains(response, '2-title')

Testing no entries

    def test_no_entries(self):
        response = self.client.get('/')
        self.assertContains(response, 'No blog entries yet.')

Contiene contenido

def test_judge_create_displays_form(self):
        url = reverse('agency:judge_create')
        response = self.client.get(url)

        self.assertContains(response, 'name="first_name"')
        self.assertContains(response, 'name="last_name"')
        self.assertContains(response, 'name="middle_name"')
        self.assertContains(response, 'name="status"')

Testing Forms

Ensure that form.is_valid() is True. // Ensure that form.is_valid() is False

def test_valid_data(self):
    form = CommentForm({
        'name': "Turanga Leela",
        'email': "[email protected]",
        'body': "Hi there",
    }, entry=self.entry)
    self.assertTrue(form.is_valid())
    comment = form.save()
    self.assertEqual(comment.name, "Turanga Leela")
    self.assertEqual(comment.email, "[email protected]")
    self.assertEqual(comment.body, "Hi there")
    self.assertEqual(comment.entry, self.entry)

def test_blank_data(self):
    form = CommentForm({}, entry=self.entry)
    self.assertFalse(form.is_valid())
    self.assertEqual(form.errors, {
        'name': ['required'],
        'email': ['required'],
        'body': ['required'],
    })

The Django test client cannot test form submissions, but WebTest can. We’ll use django-webtest to handle testing the form submission.

from django_webtest import WebTest

class EntryViewTest(WebTest):
    def test_view_page(self):
    page = self.app.get(self.entry.get_absolute_url())
    self.assertEqual(len(page.forms), 1)

Testing sending

    def test_form_error(self):
        page = self.app.get(self.entry.get_absolute_url())
        page = page.form.submit()
        self.assertContains(page, "This field is required.")

    def test_form_success(self):
        page = self.app.get(self.entry.get_absolute_url())
        page.form['name'] = "Phillip"
        page.form['email'] = "[email protected]"
        page.form['body'] = "Test comment body."
        page = page.form.submit()
        self.assertRedirects(page, self.entry.get_absolute_url())

Coverage, a tool that measures code coverage for Python code, will be used to check what percentage of the tutorial code is being tested.

First install coverage with pip $ coverage run --include='./*' manage.py test

Prettify the coverage report coverage html

Branch coverage

coverage run --include='./*' --branch manage.py test
coverage report

Coverage configuration (.coveragerc)

[run]
include = ./*
branch = True

Now we can run -->

coverage run manage.py test
coverage html

Testing gravatar images

    def test_gravatar_url(self):
        comment = Comment(body="My comment body", email="[email protected]")
        expected = "http://www.gravatar.com/avatar/5658ffccee7f0ebfda2b226238b1eb6e"
        self.assertEqual(comment.gravatar_url(), expected)

Averiguar sobre BDD (Behavioral-Driven development)

pyjavo/test_driven_development_django.md