Even after adding 'django.contrib.auth', and 'django.contrib.contenttypes' to INSTALLED_APPS in tests/settings/default.py and trying to get tests/thumbnail_tests/urls.py in shape for Django 1.10, many tests fail. I probably do not know enough about Django to solve this.
Thank you, Tim!
This can be closed now that the PR is merged.
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PR: https://github.com/mariocesar/sorl-thumbnail/pull/459