How to submit image uploads in Django tests?

Question

The Django docs (http://docs.djangoproject.com/en/dev/topics/testing/#django.test.client.Client.post) say to do this:

>>> c = Client()
>>> f = open('wishlist.doc')
>>> c.post('/customers/wishes/', {'name': 'fred', 'attachment': f})
>>> f.close()

But when I do that the field has the error message "The submitted file is empty." That smells like a PIL issue but the form works fine on the actual site.

Reading the file and sending that instead of just a handle doesn't work either and behaves the same as passing an empty string.

Answer 1

OK I figured it out. I was using the same dummy image for multiple fields and Django doesn't reset the pointer after validating the first field.

Also the example in the docs doesn't show that images need to be opened in binary mode as well.