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February 17, 2017 09:21
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Use file storage on the local filesystem in Django unit tests
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import shutil | |
import tempfile | |
from django.conf import settings | |
from django.core.files.storage import FileSystemStorage | |
from django.db.models import FileField | |
from django.db.models.loading import get_model, get_models | |
from django.test.runner import DiscoverRunner | |
class LocalStorageDiscoverRunner(DiscoverRunner): | |
""" | |
Use file storage on the local filesystem in unit tests. | |
Inspiration: https://www.caktusgroup.com/blog/2013/06/26/media-root-and-django-tests/ | |
""" | |
def setup_test_environment(self): | |
super().setup_test_environment() | |
# Keep track of original storages. | |
settings._original_media_root = settings.MEDIA_ROOT | |
settings._original_file_storage = settings.DEFAULT_FILE_STORAGE | |
settings._original_fields_storages = {} | |
# Creates a temporary directory. | |
settings._temp_media_dir = tempfile.mkdtemp(dir=settings.BASE_PARENT_DIR) | |
# Use the FileSystemStorage for tests. | |
settings.MEDIA_ROOT = settings._temp_media_dir | |
settings.DEFAULT_FILE_STORAGE = 'django.core.files.storage.FileSystemStorage' | |
# Use the FileSystemStorage for all model fields. | |
for model in get_models(): | |
fields = [f for f in model._meta.fields if isinstance(f, FileField)] | |
for field in fields: | |
model_path = '%s.%s' % (model._meta.app_label, model._meta.model_name) | |
original_storage = (field.name, field.storage) | |
original_storages = settings._original_fields_storages.setdefault(model_path, []) | |
original_storages.append(original_storage) | |
field.storage = FileSystemStorage(location=settings.MEDIA_ROOT) | |
def teardown_test_environment(self): | |
super().teardown_test_environment() | |
# Delete the temporary directory. | |
shutil.rmtree(settings.MEDIA_ROOT, ignore_errors=True) | |
# Restore original storage. | |
settings.MEDIA_ROOT = settings._original_media_root | |
settings.DEFAULT_FILE_STORAGE = settings._original_file_storage | |
# Restore original storages for all model fields. | |
for model_path, original_storages in settings._original_fields_storages.items(): | |
model = get_model(*model_path.split('.')) | |
for field_name, original_storage in original_storages: | |
field = model._meta.get_field(field_name) | |
field.storage = original_storage | |
del settings._original_media_root | |
del settings._original_file_storage | |
del settings._original_fields_storages |
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