from __future__ import with_statement import shutil import tempfile from django.core.cache import cache from django.core.files import File 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 class FileTests(TestCase): def tearDown(self): shutil.rmtree(temp_storage_location) def test_files(self): temp_storage.save('tests/default.txt', ContentFile('default content')) # 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") obj1.normal.close() # 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"]) obj1.normal.close() # 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 does not delete the file it uses. obj2.delete() obj2.normal.save("django_test.txt", ContentFile("more content")) self.assertEqual(obj2.normal.name, "tests/django_test_2.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") obj3.default.close() # 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") obj3.default.close() # 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() def test_context_manager(self): orig_file = tempfile.TemporaryFile() base_file = File(orig_file) with base_file as f: self.assertIs(base_file, f) self.assertFalse(f.closed) self.assertTrue(f.closed) self.assertTrue(orig_file.closed)