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Testing models, forms

Form
Django Forms Deep Dive - Nathan R. Yergler

import unittest

class FormTests(unittest.TestCase):
    def test_validation(self):
        form_data = {
            'name': 'X' * 300,
        }

        form = ContactForm(data=form_data)
        self.assertFalse(form.is_valid())

Eventbrite just released a library on GitHub called rebar – https://github.com/eventbrite/rebar

from rebar.testing import flatten_to_dict

form_data = flatten_to_dict(ContactForm())
form_data.update({
        'name': 'X' * 300,
    })
form = ContactForm(data=form_data)
assert(not form.is_valid())

ModelForm

class ModelFormTests(unittest.TestCase):
    def test_validation(self):
        form_data = {
            'name': 'Test Name',
        }

        form = ContactForm(data=form_data)
        self.assert_(form.is_valid())
        self.assertEqual(form.instance.name, 'Test Name')

        form.save()

        self.assertEqual(
            Contact.objects.get(id=form.instance.id).name,
            'Test Name'
        )

FormSet

from rebar.testing import flatten_to_dict, empty_form_data

formset = ContactFormSet()
form_data = flatten_to_dict(formset)
form_data.update(
    empty_form_data(formset, len(formset))
)

Model
Fast test, slow test by Gary Bernhardt

def test_that_spam_posts_are_hidden(self):
    post = Post(mark_post_as_spam=True)
    discussion = Discussion(posts=[post])
    assert discussion.visible_posts == []

Class-based views

class SomeFormView(TemplateResponseMixin, View):
    template_name = 'some_form.html'
 
    def get(self, request):
        form = SomeForm()
 
        return self.render_to_response({
            'form': form,
        })
 
    def post(self, request):
        form = SomeForm(request.POST)
 
        if form.is_valid():
            form.save()
            messages.success(request, 'Your form has been saved!')
 
        return self.render_to_response({
            'form': form,
        })
 
 
class AjaxThingView(View):
    # Note that I don't subclass the TemplateResponseMixin here!
 
    def get(self, request):
        return HttpResponse(status=404)
 
    def post(self, request):
        id = request.POST.get('id')
 
        # Do something with the id
        return HttpResponse('some data')