Testing django mixins
April 09, 2017
You may read all these books and tutorials that tell you - test your code! This blog post is to help you test your django mixins.
Why is it worth to test mixins?
You come to django world and you discover mixins - at the beginning, you think it awesome! Let write more of those!
So you write this self-contained mixin - right now there is a time to test it. It can assure that your piece of code works as expected and can save you a lot of trouble.
Ok, you are ready to write some test. How to do it?
How to test mixins?
Imagine that you have this simple
TemplateView with mixin:
from django.views.generic import TemplateView class SomethingMixin(object): def get_context_data(self, **kwargs): context = super(SomethingMixin, self).get_context_data(**kwargs) context['has_something'] = True return context class ExampleTemplateView(SomethingMixin, TemplateView): template_name = 'example.html'
SomethingMixin is adding a new key to the context. Let’s write some
from django.test import SimpleTestCase from django.views.generic import TemplateView from .views import SomethingMixin class SomethingMixinTest(SimpleTestCase): class DummyView(SomethingMixin, TemplateView): pass def test_something_mixin(self): dummy_view = self.DummyView() context = dummy_view.get_context_data() self.assertTrue(context['has_something'])
I created a simple empty
DummyView to use
SomethingMixin. I’m using
TemplateView because I don’t need more advanced views to test if
a key is in context. In
test_something_mixin I instantiate
dummy_view. Then take context test if it has a key that I’m interested
And that’s all! I have my mixin tested. Of course, if mixin become more and more complex you may need more tests.
Feel free to comment! Examples based on this gist.