Tests fail with error "AppRegistryNotReady: Apps aren't loaded yet"

[akashdoppalapudi]

I'm trying to package anymail for Debian and experienced this issue.

I'm trying to package anymail version 10.3 and when I run tests, many of them fail with error "AppRegistryNotReady: Apps aren't loaded yet"

I' using django 4.2.13 along with it.

There were generally two kinds of stack trace which directly lead to above error

ERROR: test_warns_if_no_auth (tests.test_sparkpost_webhooks.SparkPostWebhookSecurityTestCase.test_warns_if_no_auth)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/django/test/utils.py", line 461, in inner
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/tests/webhook_cases.py", line 109, in test_warns_if_no_auth
    response = self.call_webhook()
               ^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/tests/test_sparkpost_webhooks.py", line 16, in call_webhook
    return self.client.post(
           ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/test/client.py", line 948, in post
    response = super().post(
               ^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/test/client.py", line 482, in post
    return self.generic(
           ^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/test/client.py", line 609, in generic
    return self.request(**r)
           ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/test/client.py", line 886, in request
    response = self.handler(environ)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/test/client.py", line 163, in __call__
    self.load_middleware()
  File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 40, in load_middleware
    middleware = import_string(middleware_path)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/module_loading.py", line 30, in import_string
    return cached_import(module_path, class_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/module_loading.py", line 15, in cached_import
    module = import_module(module_path)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/django/contrib/auth/middleware.py", line 3, in <module>
    from django.contrib.auth.backends import RemoteUserBackend
  File "/usr/lib/python3/dist-packages/django/contrib/auth/backends.py", line 4, in <module>
    from django.contrib.auth.models import Permission
  File "/usr/lib/python3/dist-packages/django/contrib/auth/models.py", line 3, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/usr/lib/python3/dist-packages/django/contrib/auth/base_user.py", line 57, in <module>
    class AbstractBaseUser(models.Model):
  File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 129, in __new__
    app_config = apps.get_containing_app_config(module)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/apps/registry.py", line 260, in get_containing_app_config
    self.check_apps_ready()
  File "/usr/lib/python3/dist-packages/django/apps/registry.py", line 138, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

Another stack trace contains the above error but ends at an error related to translation

ERROR: test_force_dict (tests.test_utils.LazyCoercionTests.test_force_dict)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/anymail/utils.py", line 593, in force_non_lazy_dict
    return {key: force_non_lazy_dict(value) for key, value in obj.items()}
                                                              ^^^^^^^^^
AttributeError: '__proxy__' object has no attribute 'items'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/django/utils/translation/trans_real.py", line 215, in _add_installed_apps_translations
    app_configs = reversed(apps.get_app_configs())
                           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/apps/registry.py", line 147, in get_app_configs
    self.check_apps_ready()
  File "/usr/lib/python3/dist-packages/django/apps/registry.py", line 138, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/tests/test_utils.py", line 334, in test_force_dict
    result = force_non_lazy_dict(
             ^^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/anymail/utils.py", line 593, in force_non_lazy_dict
    return {key: force_non_lazy_dict(value) for key, value in obj.items()}
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/anymail/utils.py", line 593, in <dictcomp>
    return {key: force_non_lazy_dict(value) for key, value in obj.items()}
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/anymail/utils.py", line 595, in force_non_lazy_dict
    return force_non_lazy(obj)
           ^^^^^^^^^^^^^^^^^^^
  File "/home/akash/Packaging/django-anymail/django-anymail/.pybuild/cpython3_3.11_anymail/build/anymail/utils.py", line 577, in force_non_lazy
    return str(obj)
           ^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/functional.py", line 155, in __text_cast
    return func(*self.__args, **self.__kw)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/translation/__init__.py", line 95, in gettext
    return _trans.gettext(message)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/translation/trans_real.py", line 379, in gettext
    _default = _default or translation(settings.LANGUAGE_CODE)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/translation/trans_real.py", line 292, in translation
    _translations[language] = DjangoTranslation(language)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/django/utils/translation/trans_real.py", line 169, in __init__
    self._add_installed_apps_translations()
  File "/usr/lib/python3/dist-packages/django/utils/translation/trans_real.py", line 217, in _add_installed_apps_translations
    raise AppRegistryNotReady(
django.core.exceptions.AppRegistryNotReady: The translation infrastructure cannot be initialized before the apps registry is ready. Check that you don't make non-lazy gettext calls at import time.

There are few more errors with same exceptions as above from different tests.
Can you please help me with these?