After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

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from django.test import TestCase

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from django.test.client import Client

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from django.core import management

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from cm.models import *

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class HistoryTest(TestCase):

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    fixtures = ['test_comments',]

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    def test_revert(self):

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        text = Text.objects.all()[0]

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        text_version = text.last_text_version

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        text.revert_to_version(text_version.key)

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