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This is a simple proof of concept demonstrating how I like to handle files during tests.
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""" | |
This is a simple proof of concept demonstrating how I like to handle files during tests. | |
Setup | |
----- | |
wget http://hbn.link/1NoLHf0 | |
virtualenv .venv | |
source .venv/bin/activate | |
pip install django django-inmemorystorage | |
Usage | |
----- | |
python test_image_and_file_field.py | |
How it works | |
------------ | |
The script will: | |
1. setup a single file django project with an in-memory database; | |
2. create the models Document and Animal; | |
3. make sure each model has a database table; | |
4. run our test case. | |
""" | |
from django.conf import settings | |
from django.db import models, connection, utils | |
from django.test import TestCase, override_settings | |
from django.core.files.uploadedfile import SimpleUploadedFile | |
# Configure Django if needed. | |
if not settings.configured: | |
from pathlib import Path | |
from django import setup | |
settings.configure( | |
DATABASES=dict(default=dict(ENGINE='django.db.backends.sqlite3', NAME=':memory:')), | |
ROOT_URLCONF=Path(__file__).stem, | |
SECRET_KEY='secret' | |
) | |
setup() | |
# Declare the model | |
class Document(models.Model): | |
blob = models.FileField() | |
__module__ = 'app.models' # hack to trick Django | |
class Meta: | |
app_label = 'app' # Compensate for the hack above. | |
class Animal(models.Model): | |
picture = models.ImageField() | |
__module__ = 'app.models' # hack to trick Django | |
class Meta: | |
app_label = 'app' # Compensate for the hack above. | |
# Make sure model has a table. | |
with connection.schema_editor() as schema_editor: | |
for model in (Document, Animal): | |
try: | |
schema_editor.create_model(model) | |
except utils.OperationalError: | |
pass # Ignore if table exists | |
# Declare tests... | |
# Tiniest Gif ever: 26 bytes | |
# source: http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever | |
TINY_GIF = b'GIF89a\x01\x00\x01\x00\x00\xff\x00,\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x00;' | |
@override_settings(DEFAULT_FILE_STORAGE='inmemorystorage.InMemoryStorage') | |
class TestFields(TestCase): | |
def test_image_field(self): | |
Animal.objects.create(picture=SimpleUploadedFile('tiny.gif', TINY_GIF)) | |
self.assertTrue(Animal.objects.exists()) | |
def test_file_field(self): | |
Document.objects.create(blob=SimpleUploadedFile('license.txt', 'GPL'.encode())) | |
self.assertTrue(Document.objects.exists()) | |
if __name__ == '__main__': | |
# Run our test. | |
from django.test.runner import DiscoverRunner | |
DiscoverRunner().run_tests('', extras=[TestFields]) |
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