django1/tests/modeltests/files/tests.py

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import shutil
import sys
from django.core.cache import cache
from django.core.files.base import ContentFile
from django.core.files.uploadedfile import SimpleUploadedFile
from django.test import TestCase
from models import Storage, temp_storage, temp_storage_location
if sys.version_info >= (2, 5):
from tests_25 import FileObjTests
class FileTests(TestCase):
def tearDown(self):
shutil.rmtree(temp_storage_location)
def test_files(self):
# Attempting to access a FileField from the class raises a descriptive
# error
self.assertRaises(AttributeError, lambda: Storage.normal)
# An object without a file has limited functionality.
obj1 = Storage()
self.assertEqual(obj1.normal.name, "")
self.assertRaises(ValueError, lambda: obj1.normal.size)
# Saving a file enables full functionality.
obj1.normal.save("django_test.txt", ContentFile("content"))
self.assertEqual(obj1.normal.name, "tests/django_test.txt")
self.assertEqual(obj1.normal.size, 7)
self.assertEqual(obj1.normal.read(), "content")
# File objects can be assigned to FileField attributes, but shouldn't
# get committed until the model it's attached to is saved.
obj1.normal = SimpleUploadedFile("assignment.txt", "content")
dirs, files = temp_storage.listdir("tests")
self.assertEqual(dirs, [])
self.assertEqual(sorted(files), ["default.txt", "django_test.txt"])
obj1.save()
dirs, files = temp_storage.listdir("tests")
self.assertEqual(
sorted(files), ["assignment.txt", "default.txt", "django_test.txt"]
)
# Files can be read in a little at a time, if necessary.
obj1.normal.open()
self.assertEqual(obj1.normal.read(3), "con")
self.assertEqual(obj1.normal.read(), "tent")
self.assertEqual(list(obj1.normal.chunks(chunk_size=2)), ["co", "nt", "en", "t"])
# Save another file with the same name.
obj2 = Storage()
obj2.normal.save("django_test.txt", ContentFile("more content"))
self.assertEqual(obj2.normal.name, "tests/django_test_1.txt")
self.assertEqual(obj2.normal.size, 12)
# Push the objects into the cache to make sure they pickle properly
cache.set("obj1", obj1)
cache.set("obj2", obj2)
self.assertEqual(cache.get("obj2").normal.name, "tests/django_test_1.txt")
# Deleting an object deletes the file it uses, if there are no other
# objects still using that file.
obj2.delete()
obj2.normal.save("django_test.txt", ContentFile("more content"))
self.assertEqual(obj2.normal.name, "tests/django_test_1.txt")
# Multiple files with the same name get _N appended to them.
objs = [Storage() for i in range(3)]
for o in objs:
o.normal.save("multiple_files.txt", ContentFile("Same Content"))
self.assertEqual(
[o.normal.name for o in objs],
["tests/multiple_files.txt", "tests/multiple_files_1.txt", "tests/multiple_files_2.txt"]
)
for o in objs:
o.delete()
# Default values allow an object to access a single file.
obj3 = Storage.objects.create()
self.assertEqual(obj3.default.name, "tests/default.txt")
self.assertEqual(obj3.default.read(), "default content")
# But it shouldn't be deleted, even if there are no more objects using
# it.
obj3.delete()
obj3 = Storage()
self.assertEqual(obj3.default.read(), "default content")
# Verify the fix for #5655, making sure the directory is only
# determined once.
obj4 = Storage()
obj4.random.save("random_file", ContentFile("random content"))
self.assertTrue(obj4.random.name.endswith("/random_file"))
# Clean up the temporary files and dir.
obj1.normal.delete()
obj2.normal.delete()
obj3.default.delete()
obj4.random.delete()