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A pytest plugin for preserving the order in which Django runs tests.

Project description

pytest-django advertises “easy switching.” While it’s true that existing unittest-style tests will work without any modifications, you may have problems switching if you depend on the order in which the Django test runner runs tests. This plugin helps preserve that order if you need it to run your tests.

Motivation

The Django test runner gives priority to Django TestCase subclasses, executing them before other Django-based tests (e.g., TransactionTestCase) and any other unittest.TestCase tests. Put differently, Django runs tests which reset the database by rolling back a transaction before tests which reset the database by truncating all tables.

pytest-django doesn’t preserve this ordering out of the box. For more, see #214. This isn’t a problem if your project’s tests can run independently of each other, in any order. However, if your project’s tests rely on initial data populated via fixtures or migrations, tests which reset the database by rolling back a transaction must run before tests which reset the database by truncating all tables, thereby deleting any initial data. The serialized_rollback option can be used to deal with this issue within a TransactionTestCase, but it has no effect across distinct test cases; once you exit a TransactionTestCase, any initial data is gone.

Installation

This plugin supports Python 2.7, 3.5, and 3.6. Install with pip:

$ pip install pytest-django-ordering

You’re done! pytest will automatically find and integrate the plugin.

Project details


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