def METHOD_NAME(self):
    random_data = os.urandom(1 << 25)
    fileobj = ContentFile(random_data)
    file = File.objects.create(name="test.bin", type="default", size=len(random_data))
    file.putfile(fileobj)
    f = file.getfile(prefetch=True)
    assert f.read() == random_data