ImportError when run test

[rcy17]

Environment

• Python 3.7
• Django 3.0.3
• django-thumbnails 0.2.2

Problem

When I try to run test code:

`which django-admin.py` test thumbnails --settings=thumbnails.tests.settings --pythonpath=.

Exception is raised that ImportError: cannot import name 'python_2_unicode_compatible' from 'django.utils.encoding' (/home/holder/repo/dyf_api/venv/lib/python3.7/site-packages/django/utils/encoding.py), which, I believe, is caused by an old version of django.

Suggestion

After searching some information, I find some a similar issue in other packages about django, which says after a special version of django, method python_2_unicode_compatible is moved to six, so I think maybe you can update this path.

[rcy17]

After I fix that in my local package, I meet new problem:

Creating test database for alias 'default'...
System check identified no issues (0 silenced).
EEEEEEEEEEEE..........E.
======================================================================
ERROR: test_delete_thumbnails (thumbnails.tests.test_commands.CommandTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_commands.py", line 16, in test_delete_thumbnails
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_django_template (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_fallback_image (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_image_field (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_resize_source_to_none (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_thumbnail_field (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_thumbnails_cache (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_thumbnails_without_source (thumbnails.tests.test_fields.ImageFieldTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_fields.py", line 17, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_get_file_path (thumbnails.tests.test_files.FilesTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_files.py", line 19, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_create (thumbnails.tests.test_images.ImageTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_images.py", line 15, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_delete (thumbnails.tests.test_images.ImageTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_images.py", line 15, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_get (thumbnails.tests.test_images.ImageTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_images.py", line 15, in setUp
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

======================================================================
ERROR: test_optimize (thumbnails.tests.test_post_processors.PostProcessorsTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./thumbnails/tests/test_post_processors.py", line 10, in test_optimize
    with open('thumbnails/tests/tests.png', 'rb') as image_file:
FileNotFoundError: [Errno 2] No such file or directory: 'thumbnails/tests/tests.png'

----------------------------------------------------------------------
Ran 24 tests in 0.054s

FAILED (errors=13)
Destroying test database for alias 'default'...

I have no idea why this error occurs. Can you give me some guidance please?