#34180: Document that setting language in tests affects other tests
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Reporter: Václav | Owner: nobody
Řehák |
Type: Bug | Status: new
Component: | Version: 4.1
Documentation | Keywords: documentation i18n
Severity: Normal | tests
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The testing documentation
https://docs.djangoproject.com/en/4.1/topics/testing/tools/#setting-the-
language suggests to set language in tests using a cookie or http header.
But it is not obvious to the reader that doing so will switch the Django
active language for all other subsequent tests.
In our case we had random test failures in parallel run depending on the
actual order of tests executed. This is easily reproducible with the
following test file
{{{
from django.contrib.auth.forms import AuthenticationForm
from django.test import TestCase
class ViewTestCase(TestCase):
def test_czech_request(self):
self.client.get("/", HTTP_ACCEPT_LANGUAGE="cs-cz")
class FormTestCase(TestCase):
def test_form(self):
f = AuthenticationForm(data={})
self.assertEqual(f.errors['username'], ['This field is
required.'])
}}}
This testsuite passes in normal run (form is tested before the view) but
fails when running tests with --reverse as the view test switches Django
to Czech language and the validation errors of the form are translated.
I'm not sure if this can be fixed (should the test runner activate the
default language before each test?) but I suggest to at least document it
and probably recommend the user to activate the default language in
tearDown method.
{{{
def tearDown(self):
translation.activate(settings.LANGUAGE_CODE)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/34180>
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