Create temporal file to test

test_file.py

from django.test import TestCase
from django.core.files.base import ContentFile
from django.core.files.storage import default_storage

class ToolsTest(TestCase):

    def test_file(self):
        """Creates a tmp file"""
        tmp_file = default_storage.save('tools/default.txt',
                                        ContentFile('default content'))
        default_storage.delete(tmp_file)