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djet 0.0.9

Set of helpers for easy testing of Django apps.

djet

Django Extended Tests is set of helpers for easy testing of Django apps.

Main features:

  • easy unit testing of Django views (ViewTestCase)
  • additional useful assertions for testing:
    • response status codes (StatusCodeAssertionsMixin)
    • emails (EmailAssertionsMixin)
    • messages (MessagesAssertionsMixin)
    • model instances (InstanceAssertionsMixin)
  • handy helpers for testing file-related code (InMemoryStorageMixin and others)

Developed by SUNSCRAPERS with passion & patience.

Build Status

Installation

To install djet use PyPI:

$ pip install djet

Why djet?

Testing views

Django test client performs integration tests. All middlewares, resolvers, decorators and so on are tested. Just a single failure in a middleware can break all the view tests.

One technique of performing the tests was presented at DjangoCon Europe 2013 Warsaw. We have always used a slightly different method, which we would like to present as an alternative to the DjangoCon approach.

djet makes performing unit tests for your views easier by providing ViewTestCase. Instead of self.client you will use self.factory which is an extended RequestFactory with overridden shortcuts for creating requests (eg. path is not required parameter).

Sometimes you would need middlewares to be applied in order to test the view. There is an option that helps specify which middlewares should be used in a single test or a whole test case by applying middleware_classes argument. This argument should be a list of middleware classes (e.g. SessionMiddleware) or tuples where first argument is middleware class and rest items are middleware types (from MiddlewareType class). In this case only indicated middleware methods will be call.

Additional assertions

There are also some additional useful assertions in different mixins in djet.assertions module.

Currently there are StatusCodeAssertionsMixin, EmailAssertionsMixin, MessagesAssertionsMixin and InstanceAssertionsMixin full of useful assertions.

Remember that if you want to use assertions eg. from MessagesAssertionsMixin you must also add middleware_classes required by messages to your test case. We do not add them for you in mixin, because we believe those mixins shouldn't mess with middlewares, as they are required by your view in fact.

Helpers for testing files uploads

There are three main annoying things while testing files related things in Django and djet.files module helps with all of them

First thing - you will not need any files put somewhere next to fixtures anymore. create_inmemory_file and create_inmemory_image are ready to use. Those helpful functions are taken from great blog post by Piotr Maliński with just a few small changes.

You can also use InMemoryStorage which deals with files being saved to disk during tests and speed ups tests by keeping them in memory.

InMemoryStorageMixin does another great thing. It replaces DEFAULT_FILE_STORAGE with InMemoryStorage for you and also removes all files after test tearDown, so you will no longer see any files crossing between tests. You can also give here any storage you want, it only should implement clear method which is invoked after tearDown. InMemoryStorageMixin cannot be used with bare unittest.TestCase, you have to use TestCase from Django or ViewTestCase from djet.

Other utils

utils.refresh helps you get newer version of object from database in a very simple way.

Examples

We encourage you to import whole djet modules, not classes.

from djet import assertions, testcases
from django.contrib import messages
from django.contrib.messages.middleware import MessageMiddleware
from django.contrib.sessions.middleware import SessionMiddleware
from yourapp.views import YourView
from yourapp.factories import UserFactory

class YourViewTest(assertions.StatusCodeAssertionsMixin,
                   assertions.MessagesAssertionsMixin,
                   testcases.ViewTestCase):
    view_class = YourView
    view_kwargs = {'some_kwarg': 'value'}
    middleware_classes = [
        SessionMiddleware,
        (MessageMiddleware, testcases.MiddlewareType.PROCESS_REQUEST),
    ]

    def test_post_should_redirect_and_add_message_when_next_parameter(self):
        request = self.factory.post(data={'next': '/'}, user=UserFactory())

        response = self.view(request)

        self.assert_redirect(response, '/')
        self.assert_message_exists(request, messages.SUCCESS, 'Success!')

If you want to test function-based view you should do it like this:

class YourFunctionViewTest(testcases.ViewTestCase):
    view_function = your_view

There is special create_view_object helper for testing single view methods, which applies the view_kwargs specified to created view object. You can also provide request, args and kwargs here and they will be bounded to view, like it normally happens in dispatch method.

You can always create view object with different kwargs by using self.view_class constructor.

class YourViewObjectMethodTest(testcases.ViewTestCase):
    view_class = YourView
    view_kwargs = {'redirect_url': '/'}

    def test_some_view_method(self):
        request = self.factory.get()
        view_object = self.create_view_object(request, 'some arg', pk=1)

        view_object.some_method()

        self.assertTrue(view_object.some_method_called)

An example of test using all files goodies from djet:

from djet import files
from django.core.files.storage import default_storage
from django.test.testcases import TestCase

class YourFilesTests(files.InMemoryStorageMixin, TestCase):

    def test_creating_file(self):
        created_file = files.create_inmemory_file('file.txt', 'Avada Kedavra')

        default_storage.save('file.txt', created_file)

        self.assertTrue(default_storage.exists('file.txt'))

You can also make assertions about the lifetime of model instances. The assert_instance_created and assert_instance_deleted methods of InstanceAssertionsMixin can be used as context managers. They ensure that the code inside the with statement resulted in either creating or deleting a model instance.

from django.test import TestCase
from djet import assertions
from yourapp.models import YourModel

class YourModelTest(assertions.InstanceAssertionsMixin, TestCase):

    def test_model_instance_is_created(self):
        with self.assert_instance_created(YourModel, field='value'):
            YourModel.objects.create(field='value')

Utils example:

from djet import utils, testcases
from yourapp.models import Flower
from yourapp.views import ChangeFlowerView

class ChangeFlowerViewTest(testcases.ViewTestCase):

    def test_changing_flower_color(self):
        flower = Flower.objects.create(color='orange')
        post_data = {
            'color': 'blue',
            'id': flower.pk
        }
        request = self.factory.post(data=post_data)

        self.view(request)

        changed_flower = utils.refresh(flower)
        self.assertEqual('blue', changed_flower.color)
 
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